Search

The vessel will be undertaking dive operations in the vicinity of Blythe, Elgood and the Thames Pipeline.  The vessel will perform various installation, tie-in, mattress laying and metrology activities using divers and ROV

All activities will be performed by the dynamically positioned Dive Support Vessel Seven Pegasus

Call-sign: A8SH2, MMSI: 636 014 212

LOA: 132 metres, Breadth: 22 metres

The vessel will be using twin diving bells to deploy the divers and the crane to manoeuvre and install subsea equipment.  The vessel will also be using a remotely operated vehicle (ROV) in the water.  These activities this will severely restrict her ability to manoeuvre.

During all diving operations, the vessel will be flying flag Alpha with restricted movement and unable to perform course changes or manoeuvring.

RV Cefas Endeavour (Call Sign: VQHF3) intends to undertake an annual fishing survey for stock assessment between 4th October 2021 until 7th November 2021. Survey operations will include the sampling of water at pre-determined sampling stations and mid-water trawls along pre-determined transects (the location of the trawls along the transect will be determined when on-site through the detection fish schools). Where static fishing gear is believed to be present in the vicinity of these operations, fishermen are requested to advise the vessel (and/or the designated contact below) with positions of such gear in order for it to be included within the survey planning.

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Mariners are advised that the following vessels continue to be active at the Triton Knoll Offshore Wind Farm as outlined within previously issued NtM's:

Demarcation Buoys

Partrac Ltd have deployed x12 Demarcation Buoys and x2 Metocean Buoy at the Triton Knoll Offshore Wind Farm (TKOWF) to mark the perimeter of the TKOWF site boundaries.

Vessels are requested to leave a wide berth during the installation operations. The buoys will be deployed for a period of two years, and all equipment will be removed at the end of the installation.

Mariners are advised that all foundations monopiles have been installed and all inter-array and export cables have been installed.

Local Notice to Mariners Recently

NtM 001-2021 (05th January 2021)

NtM 002-2021 (20th January 2021)

NtM 003-2021 (17th March 2021)

NtM 004-2021 (24th March 2021)

NtM 005-2021 (06th April 2021)

NtM 006-2021 (16th April 2021)

NtM 007-2021 (18th May 2021)

NtM 008-2021 (29th June 2021)

NtM 009-2021 (29th July 2021)

NtM 010-2021 (20th August 2021)

Navigation Warning - 08th January 2021

Mariners are advised that the remnants of a Wave Rider Buoy sinker weight and partial rigging are located within the Triton Knoll Offshore Wind Farm Construction site at the following location;

53° 30.442N 000° 50.564E

It is advised that the partial rigging could potentially be floating up to 9.7m above the seabed, reducing the navigable safe water in the immediate area to 10m LAT.  Mariners are advised to avoid the indicated position by 250 metres.

Possible Dangers to Navigation - Properties of the polypropylene show that the rope is buoyant, this makes the line sensitive for thruster currents. Taking the site water depth into consideration (19.7m LAT) and the maximum expected height above seabed of the rope 9.7m the line is expected to be floating submerged at approximately -10m LAT. In addition, it is noted that over time sediments will be trapped between the fibres and the heavier rope may finally sink. The polypropylene rope may impose a risk to foul propellers / propulsion of vessels due to the buoyant nature of the rope. As the rope is submerged at a depth of ~-10m LAT the risk is considered minimum for vessels with a shallow draught (<5m) and medium for a vessel with a deeper draught (>5m). Over time sediments will be trapped between the fibres and the heavier rope may finally sink thereby reducing the risk to propellers/propulsion of vessels. The clump weight itself (chain) is expected to have sunk into the seabed and has no significant height above seabed. In addition, the edges of the clump weight are mostly rounded (chain), the risk the clump weigh imposes to fishing activities/gear is therefore considered to be minimal.

Navigation Warning - 16th March 2021

Mariners are advised that two UXO targets have been confirmed within the Triton Knoll Offshore Wind Farm Array.

Mariners are advised that the two confirmed targets are located within 20 metres water depth (LAT) and a 10 metre radius exclusion zone is required around each target.  The following table provides the coordinates and a description for each target.

Navigation Warning - 25th May 2021

Mariners are advised that during a Man Overboard Recovery drill a “Dead Fred Casualty” was subsequently lost, presumed sunk to the seabed in the following position;

Latitude - 53° 30.27’N

Longitude - 000°40.55’E

Water Depth – 79m LAT

If the object is recovered, please contact the following in the following order.

• Triton Knoll Marine Coordination Centre:
• Email – tkmcc@smchse.com
• Tel – 0045 82 13 62 19

• Lee Cornwell - External Consultant – Marine Operations
• Email - l.cornwell@tritonknoll.co.uk
• M: +44 (0)7384 807293

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The USVs will be mobilised from Hartlepool Marina where each will transit under escort to the survey area. Survey operations will be continuous, 24 hours a day, A support vessel will escort the USV throughout the operations from the harbour entrance and will then continue transiting towards the survey site until the area is safe & clear of hazards. Although the vessel is uncrewed, it is managed throughout the 24hour operation piloted remotely using 360 degree cameras and other navigational aids. Passing vessels are requested to maintain a minimum 500m safety distance from USV during operations, reducing speed to minimise wake disturbance.

The work site is located East of Redcar and North of Saltburn-by-the-sea and extends approximately 13km from the beach. No explosive ordnance disposal operations (EOD) will be conducted at the site during 2021. Voe Vanguard call sign:MBEN9 will be supported by the guard vessel 'Precision 1'. call sign: 2FCD2. 

As part of the operations a Met Buoy will be deployed. 

Met Buoy coordinates now updated.

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The purpose of the surveying work shall be to determine the seabed and geological conditions at the proposed well location and identify any geological, topographical, shallow gas hazards or environmental conditions which could impair the satisfactory emplacement of a drilling rig at the defined location and the subsequent drilling operations.

2D HR Seismic Survey

Sub-Bottom Profiler Pinger survey

Echo sounder Survey

Multi- Beam Survey

Visual Survey drop Camera

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Please be advised that installation of the Havhingsten fibre optic telecommunication cable system in the Irish Sea outside of the Irish 12 nautical miles is delayed due to ongoing vessel maintenance issues in; works are expected to re-commence from the 21 September. Works within the Irish 12 nautical miles are planned from December 2021.

The supplier of the Havhingsten cable is Alcatel Submarine Networks (ASN). Intertek are the environmental and permitting consultants.

The entire cable system will comprise marine elements that pass from Denmark to the UK (NE region); from the UK (NW) to the Republic of Ireland; with two segments installed into landfalls on the Isle of Man. 

The cable route for the western Irish Sea region is shown below, landing at Loughshinny in Ireland. Works in September-October 2021 will be undertaken from the Isle of Man 12nm and will stop at the Irish 12 nautical miles.

Installation will be via industry standard burial tools including water jetting and ploughing. Target cable burial depth is 1.5m below seabed level in the region.

It is anticipated that installation operations in UK/Irish waters will occupy up to a maximum 500m width (250m either side of cable). The cable itself will occupy only 40mm of the seabed.

Expected speed of installation will be approximately 17 km per day.

The moorings have been deployed and will remain on site until the estimated completion date of the 20th October 2021. The locations of the moorings have been provided in this notice and charted in the attached NtM. Onshore HDD operations are taking place for three pipe ducts to be installed with trajectories that will emerge at the seabed around 400m offshore within the area identified as ‘Mooring Extent’ detailed in this notice, and shown in the attached NtM. Vessels are required to continue to maintain a safe distance from the ‘Mooring Extent’ area until the estimated completion date of 20th October 2021.

• Within the boundaries of the mooring area, steel ducts have been pushed out from each of the three HDD exit points and extend up to 10 m into the water column at an angle of approximately 9º to the horizontal as shown in the NtM.
• The RONA or Pulsar shall conduct a high-resolution survey of the HDD exit point. The Survey will involve the use of Multibeam Echosounder (MBES) and Sidescan Sonar (SSS). Most of the survey work has been completed however further survey work of this nature may take place before the estimated completion date.
• The mooring spread has been installed for the dive vessel ISLE OF JURA to anchor when on station. The NtM shows the mooring and anchoring system when the ISLE OF JURA is on station for duct diver support works. There will be times when the mooring system is left in situ without the vessel attached.
• The dive vessel ISLE OF JURA will leave its position temporarily and return to station in September to complete the remaining 4-5 day work phase for the vessel, the mooring system will remain in situ during this time.
• When the mooring is left in situ all anchors will be clearly surface marked with marker buoys over the moorings. The size of the buoys is approx. 1.2m diameter and 1m high.
• The buoys have lights Fl Y 5s 2M range (a single yellow flash every five seconds with a nominal range of 2 miles).
• The buoys do not have radar reflector.
• The vessel will display the Alpha flag during daylight and Red/White/Red lights during the hours of darkness.
• The protruding ducts will be cut close to the seabed prior to the moorings being removed by the estimated completion date of 20th October 2021.
• The moorings and anchors will only be of a temporary nature, once the installation works are completed, the mooring and anchors will be fully recovered.

Navigational Safety

All vessels are requested to always maintain a safe distance (500m) from the construction and survey vessels.

STAY A SAFE DISTANCE AWAY FROM DIVE FLAGS. Maintain a distance of at least 300 feet (90m) from diver down flags and buoys in open water and at least 100 feet (30m) in inlets or navigation channels.

Vessel (Isle of Jura) will display the Alpha flag during daylight and Red/White/Red lights during the hours of darkness.

The buoys are illuminated with the appropriate lights, a single yellow flash every five seconds with a nominal range of 2 miles (Fl Y 5s 2M range).

All vessels are required to comply with the COLREGS, especially rules 16 and 18 as the vessel will be restricted in her ability to manoeuvre.

Legal Notice Please be advised that this Notice to Mariners should be treated as official notice of the nature, duration and location of the works which are scheduled to take place. During the period of this notice, failure to remove equipment or entry into the identified location in a manner that would constitute a hazard to the operations described may be considered a breach of the Convention on International Regulations for Preventing Collisions at Sea 1972 and/or the Merchant Shipping Act 1995 (a breach of which can carry criminal sanctions).

Additionally, should any failure to remove any equipment within the notified location, or the presence of any vessel, prevent, obstruct, or delay the works, Scottish Hydro Electric Transmission Plc may consider taking legal action to remove the obstruction and/or seek damages for any delay, in addition to any legal costs in doing so.

Seven Atlantic Vessel (Subsea 7) – De-Watering and Tie-Ins - Penguins Redevelopment Project - Infield 27/09/21 – Depart Field 25/11/21

• DC2/DC3/DC4/DC5 Infield De-Watering and Controls Reconfiguration
• Tie-In spools between Pan-W Towhead & DC2 Manifold
• Tie-In spools between Pan-W Towhead & Pan-W XT
• Pan-W Towhead & DC2 Manifold Controls Installation
• PAN-W/DC2 Leak Test & Mattressing
• DC3 Tie-Ins
• DC7 Tie-Ins
• Brownfield Scope – UT Checks

Rockdump Vessel (TBC) – Rockdumping - Penguins Redevelopment Project - Infield 14/10/21 – Depart Field 20/10/21

• Reinstatement of rockdumping cover on DC4

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On behalf of Seagreen Wind Energy Ltd, Seaway 7 have deployed temporary construction site demarcation and wave data buoys. The Seagreen Offshore Windfarm is now marked and lit as a construction area for the duration of the construction phase. A combination of cardinal and special marks have been deployed displaying the appropriate light and shape characteristics. The coordinates of each buoy are specified below and at the request of NLB, the cardinal marks at each corner of the development site will transmit via Automatic Identification System (AIS). Three wave data buoys have also been deployed within the confines of the construction area. MARINERS ARE REMINDED to navigate with caution and keep continued watch on VHF Ch.70/16 when navigating the area.

Please be advised that Fugro will be performing site investigation works on behalf of Inch Cape Offshore Limited. The works are to be carried out within the Development Area (see Figure 1 below) for the consented Inch Cape Offshore Wind Farm located within the Outer Firth of Tay

The first phase of the site investigation works will commence on or after the 25th of September 2021, weather permitting and take up to 20 days to complete. The works will be undertaken using the vessel Despina. The second phase of the site investigation works will commence on or after the 23rd October 2021, weather permitting and take up to 25 days to complete. The works will be undertaken using the vessel Fugro Scout.

During the survey the vessel will be displaying the relevant RAM lights and displays during periods of restricted manoeuvrability. Whilst not recommended, vessels entering the survey area are requested to maintain a 500m safety zone. 

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The section of cable is approximately 450m long and will be in place, until early October 2021, weather dependent. The section of cable is shortly to be buried and then fully recovered, as part of the trial. The trial is taking place directly within the proposed inter-array cable route. A subsequent notice to mariners will be issued to advise to its removal.

Mariners are advised that the section of cable has been placed on the violet cable circuit, close to turbine location NNGF08  

General Maintenance

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Mariners are requested to remain a distance of 50m2 away from the assets

As cable exposure is a known risk at Galloper and across the offshore wind industry, we would remind Mariners of the safety   information found on the KIS-ORCA website ‘The risks of fishing near cables and renewable energy structures.’   https://kis-orca.org/safety/the-risks-of-fishing-near-cables-renewable-energy-structures/ 

To avoid crossing cables when towing equipment follow the cable corridors- locations of the cables can be found on the   Galloper awareness charts via KIS-ORCA. 

Passive acoustic monitoring using a towed hydrophone array will be carried out along a pre-defined transect line (see attachment for survey area).  A vertical CTD Rosette sampler and plankton net will be deployed at night at the locations within the attachment. All these operations are to take place within 80nm of the coast, from coastal habitats to the shelf-edge habitats.

The core aim of the proposed survey is to collect data on distribution and abundance of cetacean over the Malin Shelf, so far lacking, using a robust combination of visual (transect-line, JNCC protocol) and passive acoustic (PAM) survey techniques. Collection of oceanographic data (underway SST, salinity and chl-a measurements; vertical CTD profiles in selected location) and of information on lower trophic levels (zooplankton sampling) will allow a multi-disciplinary, ecosystem-based approach and maximization of the shiptime opportunity. Noise recordings will be collected along the survey to describe ocean soundscape, map and quantify anthropogenic noise in the area (MSFD standards).

This project brings together research institutes from the Republic of Ireland (GMIT) and Northern Ireland (AFBI, Ulster University). The goal is to cooperatively and coherently built knowledge in a cross-border area of shared interest, while providing opportunity for early career scientist to gain experience in project leadership and complement their previous experiences of ship-based research.

The Abeko Server 2 Will carry out dredging activity to form two pre-cut trenches for DBA and DBB cable route corridors using the on-board long reach excavator. There will be spoil management activities being carried out throughout, to ensure the soil heaps don’t reduce the water depth by more than a statutory 5%. She will be carrying out the excavation activities on DBA and DBB during the night. The duration of these works is estimated to be seven days. See fig 2 below.

The Haven Seariser 4 will also remain on site 24 hrs during operations, unless threatened by extreme weather, continuing diving operations. These may be carried out in the hours of darkness. A short safety message will be broadcast on CH16 advising of diving operations starting and ceasing.

The MTS Valour will be anchored in the field during the nearshore activities. She will remain on station/site during the night and manned 24 hours throughout. The MTS Valour will provide assistance during diving operations and any barge movements required.

The RHIB Celtic Mara will be carrying out Multi-Beam Echo Sounder (MBES) surveys of the seabed and along the pre-cut trenches throughout the dredging activities. The survey gear will be positioned on a side mounted pole and extended into the water. Celtic Mara will transit daily from Bridlington Harbour to the Haven Seariser 4 and Abeko Server 2

During survey operations the Celtic Mara will be restricted in her ability to manoeuvre. It is requested that all vessels give the Celtic Mara a 500m safety clearance zone and reduce speed when passing. She will display the appropriate lights and day shapes.

During dredging and diving operations it is requested that The Abeko Server 2 and Haven Seariser 4 be given a 500m safety clearance zone. Diving flag ‘Alpha’ and the appropriate lights will be displayed during diving operations.

The survey vessel Glomar Worker will embark an explosive ordnance disposal team and are expected on site to conduct the works on or around the 21st of September. The disposal works are expected to be complete within 4 days weather conditions permitting. Depending on the nature of the ordnance differing disposal methods may be employed. Noise monitors will be placed on the seabed as part of the disposal process, coordinates of these monitors are below Any required detonations will take place during daylight hours, the Glomar Worker will commence hourly warning broadcasts four hours prior to any detonations, a final broadcast will be made 10 minutes before execution.

Glomar Worker will monitor the area for the safety of other vessels, it is requested that all vessels give the operations in excess of 1 nautical mile clearance during disposal operations.

A support vessel will escort the USV throughout the operations from the harbour entrance and will then continue transiting towards the survey site until the area is safe & clear of hazards.

It is requested that other vessels remain clear, so far as is practicable, during transit & survey operations.

Although the vessel is uncrewed, it is managed throughout the 24hour operation piloted remotely using 360 degree cameras and other navigational aids.

The USV sends real time images and situational awareness data over satellite to a team of operators keeping watch and controlling the vessel remotely 24/7.

Safety Precautions: The USV is equipped with the following to make it conspicuous to other marine traffic:

• AIS
• Navigation Lights & Sound Signal
• Active Radar Reflector
• Superstructure Painted Yellow

Seafarers are asked to avoid contact with the vessel and be aware of the operational area during this period.      

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On behalf of Seagreen Wind Energy Ltd, Nexans Norway Dykkerteknikk AS will deliver nearshore export cable protection services and diving assistance in preparation for the pull-in of three export cables at the Carnoustie export cable landfall site. The export cable works are divided into 4 campaigns with an estimated completion date of the end of February 2022.

The first campaign is to install and trench 3 self-submersible cable protection pipes. Spool pieces have been connected to the three export cable ducts. 3 self-submersible cable protection pipes will now be connected to each of the export cable ducts. The three self-sub cable protection pipes will then be trenched awaiting export cable pull-in at a date to be confirmed. 

Installation activities and diving operations will take place from the MPV Sophie. The tug Cormorant and Multi Cat Aileen M will assist in the towing of the self-submersible cable protection pipes from Dundee and installation works at the landfall site at Carnoustie Beach.

The MPV Sophie, Cormorant and Aileen M are expected to commence installation and diving activities on or around Monday 06th September although this may be delayed due to weather conditions.

Temporary rock bag moorings have been placed on the seabed to be used during the selfsubmersible cable protection pipe installation and export cable pull-in. These temporary moorings will be surface marked by day-glo pellet buoys.

The post-lay Rock Placement for Campaign 1 is planned in the following areas:

• Where pre-existing cables and pipelines are crossed by the Viking Link cable route
• Where it’s requested rock placement for cable protection

The dynamic positioning system onboard will keep the vessel in position in order to progressively and accurately install the rock in the planned locations.

The Campaign 1 post-lay Rock Placement works are being managed by Prysmian PowerLink carried out by DEME Boskalis JV using the following vessels:

• DPFPV Rockpiper call sign: 5BML3

The works covered within this Notice to Mariners (NtMs) are divided in the following activities planned to take place from:

• Cable lay 17th September – 10th October 2021
• Cable Burial 25th September – 4th December 2021

The route length of the main HVDC interconnector (2x bundles power cables + 1x Fibre Optic Cable) is in the order of 620km. The work covered by this NtM is covering the second campaign of 106km in length, starting from the end of the first campaign recently installed from the UK landfall, which encompassed the first 51km section

The Cable Lay works are being carried out by: Prysmian PowerLink using Leonardo da Vinci (IMO 9857315; MMSI 247415300; Call Sign IJVJ2).

The Cable burial works are being carried out by: Asso.subsea using Aethra (IMO 9181481; MMSI 212466000; Call Sign 5BHH4) using the trenching tool AssoTrencher IV and the Argo (IMO 9523366; MMSI 209023000; Call Sign 5BDF3) using the jetting tool AssoJet III and trenching tool AssoTrencher IV.  

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All activities (other than vessel transit) will take place within the HSE-recognised 500 m safety zone established around the platform. The WaveMaster 1 will be accompanied by an emergency response and rescue vessel while it is on station.

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The equipment is an integrated Seawatch Wavescan buoy and ZX 300M LiDAR; the purpose of the equipment is to collect oceanographic and meteorological data using a single platform. The equipment is supplied and charged by an onboard power system which uses methanol fuel cells and solar panels to recharge onboard lead acid batteries.

The equipment is equipped with a F1 (5) Y 20 s light with 4-5 nautical mile range; the light is mounted at the top of one of the masts, approximately 4 m above sea level.  

Cefas will aim to collect a maximum of 24 sediment cores to a maximum sediment depth of 1m from an area around the wreck using a piston corer (core diameter: 96mm). The volume of each sediment sample will not exceed 1m3. Should the sediment type present unsuccessful coring operations, a surface grab will be used resulting in less sediment being removed. The samples stations will be positioned based on the predicted trajectory of the main transport pathway from the SS PRUDENTIA wreck. No sediment sampling will be undertaken within 50 metres of the wreck. Sub samples from the sediment cores will be taken and frozen in glass jars and transported back to the laboratory to await oil-derived contaminant analysis. Water samples will also be collected from the water column using a conductivity, temperature and depth sensor and niskin bottles. Following the completion of sediment coring exercise, a Seaeye Falcon Remotely operated vehicle (ROV) will be operated, deployed and retrieved from the vessel and will be used around the wreck site.

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Type See detailed map on our bulletin website

Recovery of the Wave Buoy was undertaken at the proposed Erebus site, however during recovery of the wave buoy the mooring system was lost. 

An attempt to recovery a damaged mooring, currently located within the proposed Erebus site, was unsuccessful. 

The first 15 m from the upper moorings have been recovered. The remaining mooring components start from the 38 mm x 20 mm seasteel to the anchor weight on the seabed.

It is recommended that mariners remain vigilant of the moorings and make note of the approximate mooring locations.

A further attempt to recover the damaged mooring and lost mooring is expected to occur. A further NtM will be issued once details of the recovery attempt are known.

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Each unit will be laid in a string with a sinker at each end of the ADCP.  Each sinker will have a Polysteel riser line attached to it with a small yellow 250mm pickup bouy and float connected.  These buoys will be visible during slack tides and subsurface during the rest of the tidal cycle.

ADCP Positions:

For background information about Moray East, please visit: www.morayoffshore.com/moray-east

Safety Zones

Please be advised that the Scottish Ministers have authorised the use of the safety zones during construction and operation of the Moray East Offshore Wind Farm as detailed below.

During construction

• A 500 metre radius around each WTG and OSP where construction works are taking place that include sensitive activities being undertaken by vessels RAM. A maximum of three of such zones is permitted at any one time. 
• A 50 metre radius around partially completed WTGs and OSPs where work is not underway and the risk assessments identify a need. 
• A 50 metre radius around each completed WTG and OSP prior to commissioning and as required by a risk assessment process. 

During major maintenance

• A 500 metre radius around all major maintenance works being undertaken around the WTGs and OSPs. No more than one major maintenance zone is permitted at any one time.

Construction Activities

It is currently anticipated that weather permitting offshore construction works will be carried out on a continuous basis (i.e. 24 hour working, seven days a week) unless notified otherwise.

Please be aware that by virtue of its mode of operation and the equipment deployed, construction vessels listed in the table below may be Restricted in their Ability to Manoeuvre as defined under COLREGS (International Regulations for Preventing Collisions at Sea 1972, Rule 3). Masters of vessels are therefore requested to maintain their vessels and gears at a minimum safe distance from these vessels of 500 metres when they are undertaking it work and showing the appropriate shapes and lights.  Further Notice to Mariners will be issued as construction progresses.

Complete survey for geotechnical, bathymetric and seabed feature data for the pipeline design and installation contractors including geotechnical data relevant to planning and configuration of trenching and burial tools.

Complete To undertake an environmental seabed survey to investigate the ‘baseline’ or background condition of the seabed sediments and associated benthic faunal communities in the vicinity of the proposed pipeline to enable accurate measurement of future impacts from the development.  Specifically, the environmental survey should aim to assess:

• • Benthic faunal communities;
  • Sediment grain size;
  • Sediment chemistry (metal, hydrocarbons and organic content).

In addition, a habitat assessment shall be conducted to identify any potential Annex I habitats (EU Habitats Directive) and establish the occurrence of relevant Priority Marine Features (PMFs) in the survey area, such as habitats and species included on the OSPAR list of threatened and/ or declining species and habitats, in addition to those included in the UK Biodiversity Action Plan (UKBAP) Priority List and the Scottish Biodiversity List.

James Fisher Marine Services would like to inform mariners that Vessel based ROV Inspections are due to commence on 15th September 2021 within the ENI UK Liverpool Bay Areas. These works involve; Inspection of the ENI platforms and the Oil Storage Tanker buoy and anchor chains by Remotely Operated Vehicle (ROV) operated from the EDT Jane

Vessel Polar Onyx, will complete Hewett field pipelines/umbilical's and susbea wells survey of the entire subsea infrasructure. Work consists of ROV operations, Multiple beam survey, pipe tracker / depth of burial survey.

Vessel Isle of Jura will carry out a nearshore 'export pipeline PL20 & PL21' survey. This will include a number of environmental grab sampling  will completed by the marine survey activities

The survey vessel, Geo Ranger has now left the project. A replacement vessel, Kommador Iona will utilise towed array equipment with side scan sonar, sub bottom profiler and magnetometer to conduct the survey of the remaining Wind Turbine Generator positions within the Seagreen site boundary.The survey vessel is expected to arrive at site on or around Wednesday the 14th of July. Seagreen Notice to Mariners 03-21 revision 4 refers.

In parallel, the existing Ketch 'A' analogue Aids to Navigation (AtoN) are to be replaced with a new Solar AtoN. 

For the period 1 Sept - 31 Oct 2021,  THREE60 has received dispensation (from  the Standard Marking schedule) to permanently isolate the Ketch 'A' analogue Aids to Navigation for installation of a new Solar AtoN.

For the period 1 Sept - 31 Oct 2021,  the existing AtoN on the Rowan Gorilla (Valaris) V Jack-up rig will continue to be in operation and the existing onsite EERV will be actively monitoring the 500m zone to mitigate the risk of ship collision. 

The RGV rig will remain at the Ketch 'A' platform until Q4 2021 following completion of the P&A scope and installation of the Solar AtoN. 

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The Safe Boreas accommodation vessel is being located into the Buzzard field for the turnaround period, beginning on the 18th April 2021. The accommodation vessel will use dynamic positioning and will be located within the 500 m exclusion zone of the Buzzard Platform, and is expected to depart around 15/10/21. The Safe Boreas will be linked to Buzzard QU Platform via a gangway interface.

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The Jack up Barge Haeva, will depart from Galahad (UKCS 48/12BA) at 53°32.75'N 01°21.55'E  and transit to the Indefatigable Hub to the Bessemer Installation, where the planned Plug and Abandonment (P&A) will commence.

The P&A activity will take approximately 60 days and the Haeva is due to leave Bessemer around the 5th November 2021.

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 Mariners are advised to use caution when transiting the area, and contact the C/S IT INTREPID on VHF Channel 16 should there be any information required.  Periodic announcements will be broadcast by the vessel on VHF Channel 16.

All vessels are requested to maintain a two (2) nautical mile Closest Point of Approach (CPA) and a 500m exclusion zone around the C/S IT INTREPID.

Mariners are advised that the Saipem 7000 (S7000) has successfully completed recovery of the previously left equipment within the boundaries of the Neart na Gaoithe (NnG) Offshore Wind Farm. The operation was completed on 17th August 2021 and the S7000 has departed site.

The equipment has been recovered from Wind Turbine Generator (WTG) location NNG-H17, however, a small section remains within the drilled socket.  This section protrudes approximately 3.1m above the level of the seabed, at the location specified in Table 6, and is to be cut at a later date.

The installed cardinal buoy, as notified in NtM 154 has been removed.

Vessels Associated with the Activity

One guard vessel is currently within the wind farm site. The guard vessel will be one of the below, which can be contacted as follows, if required:

General Safety Advice

Construction activities are ongoing within the boundaries of the Neart na Gaoithe Offshore Wind Farm.  Mariners are advised to refer to the NnG Weekly Notice of Operations where up to date information regarding activities on site is broadcast. A copy of this notice and the Weekly Notice of Operations can also be found at https://nngoffshorewind.com/resources/

Marine Coordination Contact Details

The following contact can provide more information if required. Please note that specific queries can also be addressed to the relevant vessel or shore-based representative.

Table 7 - Marine Coordination Contact Details

Fisheries Liaison

Fisheries liaison associated with the activity will be co-ordinated by Natural Power. For any commercial fishery queries please contact the NnG company Fisheries Liaison Officer (CFLO) Peter Berney, telephone: +44 (0)7391 402387 or email: NnG.FLO@naturalpower.com.

Distribution List

A central list of recipients is maintained by the company Fisheries Liaison Officer; if you are not the appropriate recipient of these notices, or do not wish to receive the notices in the future, please contact us at NnG.FLO@naturalpower.com.

A copy of this notice can also be found at https://nngoffshorewind.com/

Mariners are advised that Neart na Gaoithe Offshore Wind Farm Limited (NnGOWL) are due to commence cable burial works of the two export cables within the Neart Na Gaoithe (NnG) Export Cable Corridor. The burial of the first export cable is due to begin week commencing 21st  June 2021, at the earliest. The burial of the second export cable is due to begin week commencing 19th July 2021, at the earliest. Both export cables will be buried by a remotely operated vehicle (ROV) deployed and controlled from the Normand Pacific (LAXI7).

Prior to the burial works commencing, a ROV will complete a pre burial survey on the as-laid export cables. Once complete, an ROV equipped with a jetting tool and mechanical cutting tool will be lowered onto the seabed to commence burial works. The ROV will be guided to the as-laid export cable and commence jetting operations. A jetting tool will be used for burial operations in softer ground conditions, whilst the mechanical cutting tool will be used for burial operations in harder ground conditions. Following the burial of the two export cables, the ROV will complete a post burial survey of the export cables to ensure the target burial depth has been achieved and that the cable protection is in situ.

Area of Operations

Mariners are advised that the Normand Pacific will be mobilised from Middlesbrough to work within the boundaries of the NnG Export Cable Corridor, within the coordinates provided.

Please be aware that by virtue of its mode of operation and the equipment deployed, the Normand Pacific will at times be Restricted in its Ability to Manoeuvre as defined under COLREGS (International Regulations for Preventing Collisions at Sea 1972, Rule 3).

Masters of vessels are therefore requested to maintain their vessels and gears at a minimum safe distance from the vessel of 500 metres when it is undertaking its work and showing the appropriate shapes and lights.

An exclusion area of 500m either side of each export cable route for static fishing gear is requested.  This is shown in Figure 2 and the coordinates provided in Table 2 overleaf. The existing nearshore exclusion area will also remain in place.

Vessels with bottom-towed gear are requested to be kept clear of a reduced exclusion area once the cable laying commences, which will be notified by the Company Fisheries Liaison Officer.

Schedule

The export cable burial is due to begin week commencing 21st June 2021 at the earliest, weather dependant. The cable burial works will be undertaken on the first export cable between June 2021 and July 2021, and on the second export cable between end July 2021 and August 2021. It is anticipated that both export cable burial works will be completed by end August, weather dependent.

Weather permitting and during daylight hours, construction works will be carried out on a continuous basis (i.e. 24-hour working, seven days a week), unless notified otherwise.

For updates on the progress of the works, information will be provided in the Weekly Notice of Operations available on the NnG project website: https://nngoffshorewind.com/resources/.

Vessels Associated with the Activity

Two guard vessels are currently on site supporting the Neart na Gaoithe Offshore Wind Farm construction. The guard vessels will be two of the below, which can be contacted as follows, if required:

Two guard vessels are currently on site supporting the Neart na Gaoithe Offshore Wind Farm construction. The guard vessels will be two of the below, which can be contacted as follows, if required:

Port of Operation The Normand Pacific will mobilise from Middlesbrough, UK.  

Adverse weather conditions  Upon adverse weather conditions, if the Normand Pacific is not able to hold on position, it will seek shelter or return to Port.

General Safety Advice  Construction activities are ongoing within the boundaries of the Neart na Gaoithe Offshore Wind Farm.  Mariners are advised to refer to the NnG Weekly Notice of Operations where up to date information regarding activities on site is broadcast. A copy of this notice and the Weekly Notice of Operations can also be found at https://nngoffshorewind.com/downloads/ 

Marine Coordination Contact Details  The following contact can provide more information if required. Please note that specific queries can also be addressed to the relevant vessel or shore based representative.

Fisheries Liaison  Fisheries liaison associated with the activity will be co-ordinated by Natural Power. For any commercial fishery queries please contact the NnG company Fisheries Liaison Officer (CFLO) Peter Berney, telephone: +44 (0)7391 402387 or email: NnG.FLO@naturalpower.com. An Offshore Fisheries Liaison Officer (OFLO) will be present on both the Norne and Cable Enterprise and can be contacted via VHF Channel 16. 

Distribution List  A central list of recipients is maintained by the company Fisheries Liaison Officer; if you are not the appropriate recipient of these notices, or do not wish to receive the notices in the future, please contact us at NnG.FLO@naturalpower.com. A copy of this notice can also be found at https://nngoffshorewind.com/  

NnGOWL is developing the NnG Offshore Wind Farm, jointly owned by EDF Renewables and ESB, which is located in the outer Firth of Forth, Scotland. The NnG wind farm area is 15 km east off Fife Ness and 29 km from the East Lothian coastline and covers an area of 105 km2

The wind farm consists of 54 no. wind turbines (WTGs) and 2 no. Offshore Substation Platforms (OSPs), with a total capacity of approximately 45 0MW. Water depths across the offshore wind farm area generally range from 40 to 60 m below LAT. The generated power will be transmitted to the grid via two subsea export cable circuits which will reach landfall at Thorntonloch Beach, East Lothian, Scotland. Specific details and location of activities within the Wind Farm Area and Export Cable Corridor will be provided via subsequent notices as work progresses.

Buoyage

Five special markers are now in position:

Four cardinal buoys are due to be deployed the week commencing 16th March. Planned deployment locations

A steel chain will be connected to each marker buoy, and the chain will be present through the water column, connected to an anchor placed on the seabed.

Mariners are advised that Neart na Gaoithe Offshore Wind Farm Limited (NnGOWL) are due to replace the current boulder clearance vessel Sartor. The Sartor will be replaced by the Vos Sweet (PCPE) from 10th August 2021, at the earliest. The Vos Sweet (PCPE) will undertake the remaining seabed preparation works within the Wind Farm Area.

The Vos Sweet (PCPE), will carry out the remaining boulder relocation operations in preparation for installation of the inter array cables in the Wind Farm Area. The Sar Fame will be undertaking boulder relocation using a Subsea Multi-Tool Remotely Operated Vehicle with a grab.

Relocation of boulders in areas of inter array cable infrastructure is a critical pre-construction activity to reduce significant Health and Safety risks to the construction phase. Boulders will be relocated a short distance from their existing position only. Boulder relocation activities will take place within the Wind Farm Area in Figure 1.

Area of Operations

Mariners are advised that the Sar Fame will be mobilised to work within the Neart na Gaoithe (NnG) Wind Farm Area. The Wind Farm Area coordinates are provided in the table below. The remaining works are expected to last approximately four months, weather dependent.

Vessels are requested to remain at least 500 metres away from the work vessel.

Schedule

The boulder relocation works commenced on the 2nd April 2021. The remaining boulder clearance works are expected to last approximately 4 months, until 30th September 2021, weather dependent.  It is currently anticipated that, weather permitting, construction works will be carried out on a continuous basis (i.e. 24-hour working, seven days a week) unless notified otherwise.

For updates on the progress of the works, information will be provided in the Weekly Notice of Operations available on the NnG project website here https://nngoffshorewind.com/resources/.

Vessels Associated with the Activity

Please be aware that by virtue of its mode of operation and the equipment deployed, the Sar Fame will at times be Restricted in its Ability to Manoeuvre as defined under COLREGS (International Regulations for Preventing Collisions at Sea 1972, Rule 3). Masters of vessels are therefore requested to maintain their vessels and gears at a minimum safe distance from the Sar Fame of 500 metres when it is undertaking its work and showing the appropriate shapes and lights.

General Safety Advice

Construction activities are ongoing within the boundaries of the Neart na Gaoithe Offshore Wind Farm.  Mariners are advised to refer to the NnG Weekly Notice of Operations where up to date information regarding activities on site is broadcast. A copy of this notice and the Weekly Notice of Operations can also be found at https://nngoffshorewind.com/resources/.

Marine Coordination Contact Details

The following contact can provide more information if required. Please note that specific queries can also be addressed to the relevant vessel or shore based representative.

Fisheries Liaison

Fisheries liaison associated with the activity will be co-ordinated by Natural Power. For any commercial fishery queries please contact the NnG company Fisheries Liaison Officer (CFLO) Peter Berney, telephone: +44 (0)7391 402387 or email: NnG.FLO@naturalpower.com.  An Offshore Fisheries Liaison Officer (OFLO) will be present on the Sar Fame and can be contacted via VHF Channel 16.

Distribution List

A central list of recipients is maintained by the company Fisheries Liaison Officer; if you are not the appropriate recipient of these notices, or do not wish to receive the notices in the future, please contact us at NnG.FLO@naturalpower.com. A copy of this notice can also be found at https://nngoffshorewind.com/.   

In preparation for the jacket foundation installation, three piles for each wind turbine location and offshore substation  platform will be installed. The piles will be installed by the Saipem 3000 (S3000) (call sign: C6SW6) into pre-drilled  sockets. Pile installation support will be provided by the Skandi Acergy (call sign: LAFD7) offshore construction vessel, which will arrive to site in late June 2021. The Skandi Acergy will transfer supporting materials and installation equipment between positions on the seabed adjacent to each foundation location. On arrival at each location, the S3000 will collect and utilise this wet-stored equipment during pile installation.  Once the three piles have been positioned within the pre-drilled sockets, grout will be inserted to secure them in place.

A supply vessel will be utilised to transport piles to NnG wind farm, as required.  Further information on the vessel for each visit will be provided on the Vessel Report and Weekly Notice to Mariners available at https://nngoffshorewind.com/resources/.

Area of Operations

Mariners are advised that the S3000 will be mobilised from Rotterdam (NL) to work within the NnG Wind Farm Area.

All vessels are requested to remain at least 500 metres away from all work vessels and the static fishing gear remains as shown in the below table.

WIND FARM AREA

EXCLUSION TO STATIC GEAR

Schedule

The pile installation work is due to begin week commencing 14th June, at the earliest. It is anticipated that the works will be completed by mid-December 2021, weather dependent. 

Weather permitting, construction works will be carried out on a continuous basis, 24-hours per day, seven days a week. 

For updates on the progress of the works, information will be provided in the Weekly Notice of Operations available on the NnG project website: https://nngoffshorewind.com/resources/.

Vessels Associated with the Activity

Please be aware that by virtue of its mode of operation and the equipment deployed, the S3000 and Skandi Acergy will at times be Restricted in their Ability to Manoeuvre as defined under COLREGS (International Regulations for Preventing Collisions at Sea 1972, Rule 3). Masters of vessels are therefore requested to maintain their vessels and gears at a minimum safe distance from these vessels of 500 metres when they are undertaking it work and showing the appropriate shapes and lights.

One guard vessel is currently within the wind farm site supporting NnG Offshore Wind Farm construction. The guard vessels will be one of the below, which can be contacted as follows, if required:

Port of Operation

The S3000 will mobilise from Rotterdam, NL. The Skandi Acergy will mobilise from Blyth, UK.

Adverse weather conditions

Upon adverse weather conditions, if the S3000 and Skandi Acergy are not able to hold on position, they will both seek shelter or return to a Port within the Firth of Forth.

General Safety Advice

Construction activities are ongoing within the boundaries of the Neart na Gaoithe Offshore Wind Farm.  Mariners are advised to refer to the NnG Weekly Notice of Operations where up to date information regarding activities on site is broadcast. A copy of this notice and the Weekly Notice of Operations can also be found at https://nngoffshorewind.com/resources/

Marine Coordination Contact Details

The following contact can provide more information if required. Please note that specific queries can also be addressed to the relevant vessel or shore based representative.

Fisheries Liaison

Fisheries liaison associated with the activity will be co-ordinated by Natural Power. For any commercial fishery queries please contact the NnG company Fisheries Liaison Officer (CFLO) Peter Berney, telephone: +44 (0)7391 402387 or email: NnG.FLO@naturalpower.com.  An Offshore Fisheries Liaison Officer (OFLO) will be present on the Sar Fame and can be contacted via VHF Channel 16.

Distribution List

A central list of recipients is maintained by the company Fisheries Liaison Officer; if you are not the appropriate recipient of these notices, or do not wish to receive the notices in the future, please contact us at NnG.FLO@naturalpower.com. A copy of this notice can also be found at https://nngoffshorewind.com/.   

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The M.V. Fugro Searcher will mobilise in Aberdeen as soon as the 21st September 2021. The survey is expected to take 4 days (not including any allowance for weather downtime).

The geophysical component of the survey will involve multibeam echosounder and sidescan sonar techniques with the vessel underway (but not towing any survey apparatus). The environmental component of the survey will involve seabed (benthic) sediment ‘grab’ sampling, and seabed photo/videography techniques being undertaken at approximately 30 stations (with the vessel stationary). 

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Please be advised that Global Marine are conducting the installation of the proposed NO-UK Telecommunications cable in UK TW and EEZ. Please note that there will be numerous vessels associated with the project. These are summarised below:

• Shore End Works  30th August – 6th September 2021

The Green Isle vessel as well as two smaller (<7m LOA) support RIBs (Echo and Speedbird) will be conducting intertidal and nearshore trenching works between 55°05.7445’N 1°29.3906’W & 55°05.8989’N 1°27.8456’W.

• Cable installation (UK TW - EEZ)  23rd July – 5th September 2021

The Normand Clipper  will be installing the proposed NOUK cable from the landing point at Seaton Sluice and laying the cable towards Norway.

• Post Lay Inspection Burial (PLIB) (UK TW - EEZ) 7th September – 15th September 2021

The Grand Canyon III (specification attached) will be conducting further PLIB activity along the cable route. Timings and locations of this activity is TBC.

The Grand Canyon III will be conducting further PLIB activity along the cable route. Timings and locations of this activity is TBC.

• Post installation rock placement vessel (UK EEZ) 29th Ssptember – 1st October 2021

The Stornes vessel will then be conducting post installation rock placement at 4 pipeline crossings. These are located at

(55Ëš19.2785’N 0Ëš18.1219’W), (55Ëš33.6028’N 0Ëš42.0795’E), (55Ëš 57.2785’N 1 Ëš38.5306’E) & (56°1.7791’N 1°55.4618’E).

The vessels will be limited in manoeuvrability. Other vessels should maintain a distance of at least 1NM from the cable ship during operations. 

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The operation is to complete survey and investigation works only, UXO clearance shall not be undertaken. The investigation shall, within the area of operation, only identify the pUXO as: UXO, suspected UXO or as non-UXO. It is of high importance that the geophysical anomalies are identified with the best possible accuracy.

The investigation survey will involve the use of Multibeam Echosounder (MBES), ROV and dredge pump, which involves the use of locally deployed equipment rather than any towed systems. Any debris that can positively be identified as non-UXO will be brought to deck if safe and reasonable to do so and disposed of appropriately onshore.

The anomaly investigation survey areas within the cable corridor are provided in this notice. An estimated 10 anomalies have been identified across the four areas. The additional ROV geophysical survey on the approach to Noss Head will cover a separate area of approximately 6km in length. The coordinates presented in this notice provide the simplified centreline of the survey areas, the geophysical and investigation survey works will be completed -/+100m either side of the centreline.

All survey and investigation activities will be conducted by the ‘Noordhoek Pathfinder’. Please be aware that the vessel will be restricted in her ability to manoeuvre as defined under COLREGs (International Regulations for Preventing Collisions at Sea 1972). Masters of vessels are therefore requested to maintain their vessels at a minimum safe passing distance of 500 metres when it is undertaking work and showing the appropriate shapes and lights in accordance with COLREGs Rules 16 and 18.

Legal Notice

Please be advised that this Notice to Mariners should be treated as official notice of the nature, duration and location of the works which are scheduled to take place. During the period of this notice, failure to remove equipment or entry into the identified location in a manner that would constitute a hazard to the operations described may be considered a breach of the Convention on International Regulations for Preventing Collisions at Sea 1972 and/or the Merchant Shipping Act 1995 (a breach of which can carry criminal sanctions). Additionally, should any failure to remove any equipment within the notified location, or the presence of any vessel, prevent, obstruct, or delay the works, Scottish Hydro Electric Transmission Plc may consider taking legal action to remove the obstruction and/or seek damages for any delay, in addition to any legal costs in doing so.

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Type See detailed map on our bulletin website

The ADCPs will be in situ on the seabed for up to 3 months. ADCP dimensions and an image of the ADCP and frame to be deployed is shown below. A marker buoy will not be used during deployments.

The ADCPs deployment locations are provided below:

It is intended for the ADCPs will remain in situ for 3 months and therefore mariners should navigate with caution.

Fugro have deployed a SeaWatch LiDAR Buoy (SWLB); this is a sea state measurement instrument (referred to as ‘the equipment’). The deployment location is within the UK Sector of the North Sea off the north coast of Scotland.

• The equipment was deployed on 29 August 2021, and will be deployed for approximately one year.
• The equipment's location is provided within the attached Notice to Mariners.
• Scheduled maintenance of the equipment is planned every six months, but unforeseen maintenance may be required.
• The equipment has been moored through a combination of steel chains, rope and rubber cord to approximately 2250 kg anchor weight at the seabed.

Please be advised that initial seabed route clearance operations along the CCF (Cross Channel Fibre) cable route between Brighton, UK and Dieppe, France are currently due to commence in UK waters off Brighton on 15 September 2021.

Deployed Guard Vessels will monitor the exposed areas of cable while burial progresses and advise of safe distances locally. VHF CH 16 will be monitored at all times and will be used to contact the coastguard in the event of an emergency.

Please note that there will be numerous vessels associated with the project. These are summarised below:

• Route Clearance 15 September – 20 September

In preparation for the installation of the CCF subsea telecommunications cable, the IT INTREPID as well as two support tugs (two of four: EN AVANT 1, EN AVANT 10, EN AVANT 9 and/or EN AVANT 20) and a smaller support vessel (<10m), WORKING GIRL II, are due to carry out initial seabed clearance operations between 50°48.391'N 00°09.278’W and 50°15.679'N 00°03.671'E.

• Pre Lay Grapnel Run 24 to 26 September 2021

IT INTREPID will then perform PLGR (Pre-Lay Grapnel Run) along the entire CCF cable route (working in a northerly direction from Veules-Les-Roses near Dieppe to Brighton).

• Cable Installation (UK TW - EEZ) 29 September – 05 October 2021

IT INTREPID will be installing the proposed CCF cable from 50°46.2307'N and 00°09.8037’W and laying the cable towards France.

BRIGHTON DIVER III and MAXIMUS will be installing the proposed CCF cable from the landing at Brighton to 50°46.2307'N and 00°09.8037’W.

• Post Lay Inspection Burial (PLIB) (UK TW - EEZ) 12th October to 20th October 2021

IT INTREPID will be conducting PLIB activity along the cable route. Timings and locations of this activity is TBC.

The vessels will be limited in manoeuvrability. Other vessels should maintain a distance of at least 500m from the cable ship during operations.

Type See detailed map on our bulletin website

Type See detailed map on our bulletin website

Geophysical works are anticipated to commence on, and no earlier than, 4th September 2021, and survey duration is expected to be approximately 6 weeks. Geophysical surveys are forecasted to be completed by 16th October 2021, but the exact survey duration and completion date will depend on weather and progress of the works.

Scope of work to include: Offshore geophysical surveys will comprise multi beam echo sounder (MBES), single beam echo sounder (SBES), side scan sonar (SSS) sub bottom profiler (SBP) and magnetometer.

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An unmanned survey operation to collect hull mounted bathymetry data using 3 vessels. The vessels are all fully controlled 24 hours a day using satellite communications. During periods of bad weather XOcean will use Hartlepool or Grimsby to transit to for shelter. The area of operation will cover the project area at Endurance and two proposed pipeline route corridors.

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On completion of the nearshore works, the temporary marker buoy will be repositioned between the exposed ducts and a further revised NtM published.

This NtM supersedes LF500013-MIP-DOG-NOT005, issued on the 1st March 2021

The marker buoy characteristics are: Yellow Special Mark, light pattern: Fl(Y)5s

Mariners are reminded to navigate with caution, keeping a safe passing distance from the temporary marker buoy and keeping a continuous watch on VHF Ch. 70/16 when navigating the area.

The marine survey works are being carried out by Next Geosolutions UKCS Ltd. on behalf of National Grid Electricity Transmission Plc and Scottish Hydro Electric Transmission Plc.

The marine survey activities are planned to commence at Sandford Bay and close to Peterhead from the 20th April 2021. Upon completion of the Nearshore Marine Survey at Peterhead the vessel will transit to Bridlington to complete the Nearshore Marine Survey at Bridlington. Works will continue along the offshore route until August 2021. The marine survey works covered by this NtM are to be conducted by three survey vessels, divided into the following activities, as indicated:

The Nearshore works are to be conducted West, of point AC6, Longitude 1° 43.5’W at Peterhead and West of point AC61, Longitude 0° 03.7’W South of Flamborough Head, Bridlington, reference Figures 1 and 2 overleaf. All vessels shall pass at a safe speed and distance, whilst fishing vessels shall remain at a safe distance (approximately 500 meters) (COLREGs Rule 16 & 18) from the areas identified during marine survey operations. The aforementioned survey vessels will be restricted in her ability to maneuver and shall deploy towed sensors during geophysical survey operations only. The survey vessels will monitor VHF Channel 16 at all times. Mobile contacts for the vessels are listed at the end of this NtM.

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The Boka Polaris, Dive Support Vessel (DSV) will be conducting leak detection and repair activities in the Eris/Ceres field areas in UKCS blocks 47/8 and 47/9.  Mobilisation is currently planned on or around 3rd September 2021 and the operation is expected to last for a total period of up to 11 days.  This schedule is subject to change depending on operational requirements.  All activity will be conducted within existing 500m zones of subsea infrastructure and there will be no towed equipment.  The DSV will be stationary over the infrastructure while the operations are taking place.  

Destination:

Mimas MN 48/09a-N1 development well

53° 45' 46.51" N

1° 42' 21.95" E

Throughout well abandonment operations there will be a dedicated ERRV on location monitoring the surrounding sea area.

• Transit to Lancaster.
• Perform ROV as found survey
• Connect rigging equipment to wellhead protective structure (WHPS).
• Recover WHPS to vessel.
• Deploy and engage cutting tool on wellhead
• Perform wellhead cut 10ft below seabed.
• Recover cutting tool and wellhead.
• Perform ROV as left survey.
• Demobilise vessel.

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A reconnaissance geaophysical survey will be carried out in the vicinity of 8 potential cable landfall locations which are currently under consideration for a future windfarm development coordinates of each of the survey areas are provided in the attached document.

Activities will include use of the following survey kit at each of the 8 cable landfalls:

• Multi Beam Echo Sounder (MBES) - used to obtain detailed 3-dimensional (3D) maps of the seafloor which show water depths. They measure water depth by recording the two-way travel time of a high frequency pulse emitted by a transducer.
• Sub Bottom Profiler (SBP) - used to identify and characterise layers of sediment under the seafloor. A transducer emits a sound pulse vertically downwards towards the seafloor, and a receiver records the return of the pulse once it has been reflected off the seafloor.
• Sound Velocity Profiler (SVP) - The SVP continuously emits high frequency pulses as it is lowered towards the seafloor in order to measure the speed of sound within the water column. This technology also makes use of sonar to determine how quickly sound attenuates in the marine environment, which can aid in calibrating geophysical survey equipment.

Mariners are advised to keep a safety clearance of the vessel of no less than 500m.

Port of Operation

Spectrum Geosurvey will mobilise / operate out of the port of Scrabster (Pentland), Stromness (Orkney) – Please note we intend to use smaller ports near locations in Orkney.

Survey duration

The survey window will commence on 4th September 2021 and run through to end of September. The total duration for survey activity is expected to take approximately 22 days. The survey vessel will be present in the region for an overall period of up to 40 days allowing for time to travel between the survey sites and an indicative 50 % downtime for weather and technical constraints.

Contact Details for Fisheries Liaison

Fisheries Liaison is being carried out by Xodus Group, for all fisheries enquires please contact Xodus Group Fisheries Liaison Officer (FLO) Gareth Jones.

Telephone number: +44 (0)1224 219996

Email: OWPLFisheries@xodusgroup.com

Spectrum Geosurvey Contact Details:

Further enquiries should be addressed to the following people:

Spectrum’s Contact 

David Hubble Notification to Mariners for OWPL Reconnaissance Geophysical Survey August 2021

01590 820 050

Info@spectrum-offshore.com

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Please be advised that the remaining post-lay burial (PLIB) works of the Havhingsten fibre optic telecommunication cable system have now been completed in the Irish Sea, but there are three areas of surface-laid cable which are pending rock placement works.

There is a maximum of 25m of cable surface laid with Uradact protection either side of the crossings listed below. Rock protection works will be carried out during the second half of 2021. It is advised that extra care is taken when vessels are operating near the areas and that no vessel should trawl within 0.25 nautical miles from the listed coordinates prior to rock placement. The rock berms will be over trawlable and in-line with industry standards.

For further information please contact the Fisheries Liaison Officer (FLO) / Fishing Industry Representative (FIR) numbers:

IoM Onshore FLO

Guy Sutton:                        rgsutton@outlook.com – 07624428332

FIR

Tom Watson:                     tomwatsonfleetwood@btinternet.com – 07903 173624

FLO (MarineSpace)

Bethan Owens:                 bethan.owens@marinespace.co.uk – 07833 557808

Claire Griffiths:                  claire.griffiths@marinespace.co.uk – 07498 550 586

Please find attached a chart showing the results of the Greater Gabbard OFTO export cable survey. The chart lists the changes to the exposures on the three export cables, on the inshore section between KP 3 and KP 5 with a free span remaining around KP 4. Between KP 36 and KP 38 there are some exposed sections as the cables enter the site. In addition, although listed as exposures on the chart, there are areas of shallow burial at KP10 and a cable exposure on the interconnector cable within the site.

The exposed/shallow burial areas are shown as the coloured dots on the cable route highlighted in a black box.  Equitix (Greater Gabbard OFTO) have asked that all Fishermen operate with caution when fishing anywhere on the cable route and particularly the areas that are shallow buried around KP10.’

Coordinates of exposed/shallow burial areas are shown on the attached chart.

The OFTO is updating its risk assessments to determine the extent of remedial measures that may be required. Equitix intend to provide an update on remediation after the risk assessment exercise is complete.’

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The target has a 500 metre exclusion zone around it with immediate effect. The vessel Glomar Worker will transmit a securite broadcast at 6 hourly intervals to alert all vessels in the area.

The Seagull Field is located on UK licence P1622 Block 22/29C. 17km south of the Eastern Trough area Project (ETAP) Central Production Facility (CPF). Neptune will develop the Seagull reservoir as a subsea tie‐back to existing seabed infrastructure over the BP operated ETAP CPF. The development is high pressure and high temperature and Neptune is the Operator for the subsea development. Neptune will also drill and complete the Seagull Wells and shall retain overall Project responsibility.

The Seagull development will require installation of new subsea equipment as follows: Four Xmas Trees; a 4 slot manifold; a 17km control umbilical (including hydraulic, electrical and chemical supplies) direct from ETAP to Seagull; a 5km 10” production pipeline; a 5km 3.5” wash water pipeline from Seagull to the existing Egret manifold; and a Wye manifold adjacent to the existing Egret manifold, through which the new Seagull production pipeline will connect with the Heron cluster pipeline system connected back to the ETAP CPF. From ETAP CPF Seagull oil and gas will be exported to shore through the GAEL and FPS pipeline systems to the Kinneil Terminal onshore.

We already have an ODA established covering the Seagull drill centre and the Egret manifold and would like to request to extend the ODA to incorporate the entire Seagull works area. The extended Offshore development area will be required commencing from September 2021 ‐ March 2023.

The target has a 500 metre exclusion zone in place with immediate effect.

The on site vessel "Glomar Worker" will transmit a securite broadcast at 6 hourly intervals giving full details of the hazard to all vessel in the area.

Please be advised that the AIS on the Inch Cape Offshore Met Mast is currently non-operational. The marine navigation lights,  foghorn, aviation lights and remain operational. This fault will be investigated and notification provided once the AIS is operational again. 

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Using vessel Guard Celena call sign : V7OY7. The survey vessel shall be towing a cable up to approximately 150m behind the vessel (the end marked by a tail buoy) at depths of up to 3m below sea level. The survey vessel shall have limited maneuverability so please allow a safe distance.

Company: Outer Dowsing Offshore Wind

Contractor: Enviros Survey & Consultancy Limited

Survey vessel : Guard Celena

Survey vessel call sign: V7OY7

Earliest start date: 10th August 2021 Latest finish date: 29th December 2021

It should be noted that the survey vessel shall be initially accompanied by a fishing vessel: Sorrento GY189 providing visual reconnaissance for any sea surface obstacles. Company : Outer Dowsing Offshore Wind

Contractor : NFFO Services Limited

Support vessel : Sorrento GY189

Support vessel call sign : 2XLE

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Landfall Preparation and Cable Installation 

The export cable installation activities in the intertidal area are ongoing at the landfall at Horseshoe Point, Lincolnshire and will continue until approximately 30th September 2021. Works will be continual and intermittent throughout these periods.

It should be noted that export cable seabed preparation and installation seaward of mean low water springs is ongoing until end of 2021.

Vessels:

Ithaca Oil and Gas Limited is planning to drill an exploration well into the Fotla reservoir to validate the geophysical interpretation of reservoir properties from seismic analysis.  Depending on initial findings, an appraisal programme will be carried out via up to two well sidetracks, with a third contingency sidetrack.  Fotla is located in Block 22/1b in the central North Sea, approximately 176km from the Scottish mainland (Peterhead), 46km from the UK/Norway median line in water depths of ca. 130m.

The rig will be onstation for aproximately 90 days.

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Alcatel Submarine Networks UK Ltd. (ASN) has been contracted to carry out construction activities of the AMITIÉ cable system (starting 2km from shore). The AMITIÉ cable system spans nearly 6,600 km in total with the initial UK landing point in Widemouth Bay, near Bude, Cornwall. The construction activities will commence 2km from shore (>15m water depth) and will utilise the cable lay vessel “Ile de Brehat” call sign: FOUC, which will commence construction operations from the nearshore area out to the UK exclusive economic zone (EEZ)). The third-party vessel ESVAGT DON WM Offshore, call sign: OUNO2 will complete the PLGR in the UK EEZ only starting on approximately 23rd July lasting approximately 2 weeks. Following this the Ile de Brehat will start by performing a pre-lay grapnel run (PLGR) in UK Territorial Seas prior to laying the cable beyond the UK continental shelf staring approximately on 8th August 2021, lasting approximately 8 weeks. The exact start and finish date will be dependent on the prevailing weather conditions and work progress. It is requested that all vessels operating within this area keep their distance, maintaining at least a 500 m exclusion zone, and pass at minimum speed to reduce vessel wash.  

The cable lay vessel, Ile de Brehat call sign: FOUC will be operating from approximately 2km from shore out to the UK EEZ laying and burying the Amitié cable, including pre-lay grapnel run (PLGR) in UK Territorial Seas. The vessel ESVAGT DON call sign: OUNO2 (WM Offshore) is also contracted to complete the PLGR works in the UK EEZ only. These operations will be conducted on an ongoing 24 hour basis. A listening watch will be maintained on VHF Channel 16, and the vessels will actively transmit an AIS signal. Please see contact details for the Ile de Brehat & ESVAGT DON 

Fugro Mercator - Offshore Geophysical Survey

The geophysical operations at the Five Estuaries site are expected to be carried out from the Fugro Mercator from 5 th August 2021 for approximately 14 weeks.

Fugro Mercator will be conducting operations across the Main Array and Export Cable Route areas >10m LAT. Please note that the exact start and finish date will be dependent on the prevailing weather conditions and work progress.

As the Fugro Mercator will be towing survey equipment the vessel will require large turning circles and will be restricted in her ability to manoeuvre. All vessels operating within this area are requested to keep their distance, maintaining at least the 500m safety zone around the survey vessel, and pass at minimum speed to reduce vessel wash.

A continuous listening watch will be conducted on VHF Channel 16.

Survey operations will be conducted on a 24-hour basis.

Curtis Marshall - Environmental Survey

The environmental operations at the Five Estuaries site are expected to be carried out from the Curtis Marshall from 2 nd November 2021 for approximately 2 weeks. Curtis Marshall will be conducting operations across the Main Array and Export Cable Route areas both offshore and nearshore. Please note that the exact start and finish date will be dependent on the prevailing weather conditions and work progress. 

As the Curtis Marshall will be deploying equipment astern of the vessel, the vessel will require large turning circles and will be restricted in her ability to manoeuvre. All vessels operating within this area are requested to keep their distance, maintaining at least the 500m safety zone around the survey vessel, and pass at minimum speed to reduce vessel wash.

A continuous listening watch will be conducted on VHF Channel 16.

Survey operations will be conducted on a 24-hour basis.

Fugro Seeker - Nearshore Geophysical Investigation

The geophysical operations on the Five Estuaries export cable route from the 10m LAT contour inshore to the potential landfall, are expected to be carried out from the survey vessel Fugro Seeker from 1 st August 2021 for approximately 6-7 weeks. Please note that the exact start and finish date will be dependent on the prevailing weather conditions and work progress.

As the Fugro Seeker will be towing survey equipment the vessel will require large turning circles and will be restricted in her ability to manoeuvre. All vessels operating within this area are requested to keep their distance, maintaining at least the 500m safety zone around the survey vessel, and pass at minimum speed to reduce vessel wash.

A continuous listening watch will be conducted on VHF Channel 16.

Survey operations will be conducted on a 12-hour basis.

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A-2-Sea Solutions Ltd will be operating the vessel ‘Cerys Line’ on a 24-hr basis. The ‘Cerys Line’ (26.1m LOA) will be underway throughout operations, sailing survey lines at 5-12 knots.

A-2-Sea Solutions will also be operating the vessel ‘Morven’ on a 24-hr basis to survey inshore of the 10m contours. The ‘Morven’ (20.0m LOA) will be underway throughout operations sailing survey lines at 4-8 knots. 

Both vessels will not be towing any equipment and only hull mounted mutlibeam echosounder will be used.

Both ‘Cerys Line’ and ‘Morven’ will exhibit the lights and shapes prescribed by the International Regulations for Preventing Collisions at Sea and will maintain a listening watch on VHF Channel 16.

The Tolmount minimum facilities platform has been installed on behalf of the Tolmount Development Project (comprising Premier Oil UK Limited, ODE Asset Management Limited and Humber Gathering System Limited (HGSL)) in UKCS Block 42/28d and an ERRV remains on location in field. 

The Valaris123 Jackup Drilling Rig is in position over the Tolmount platform, with drilling operations underway.  Drilling activity is planned for approximately 12 months (subject to further Kingfisher bulletins).  The Valaris 123  suspended NE well on 13th July 2021 and skidded to the SW well on 14th July 2021 to re-enter the SW well and will drill to completion.

Please note that an Offshore Development Area has also been requested for the Tolmount Development Project work.

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The target has a 500m exclusion zone in place with immediate effect.

The on site vessel the Glomar Worker will transmit a securite broadcast at 6 hour intervals giving full details of the hazard to all Vessels in the area.

During a CPT push at location EA1N-21-IAC-024-TCPT, the rods encountered a hard layer at 3.2m below the surface.

As communication was lost instantly at 3.1m when the rods started to be retracted, it is assumed the breakage occurred at that point and therefore the equipment was left at the 3.1m of the push. If this was the case then the top of the lost rods would be 1.15m above the seabed (in the worst case scenario).

Further investigation is planned to determine more accurately whether lost rods are above seabed level. The vessel will perform a side scan sonar survey and make use of a subsea camera at the location

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Please be advised that, installation of the Havhingsten fibre optic telecommunication cable system is complete outside of 12nm within the North Sea and at the Seaton Sluice landing. The Whitley Bay stub works are scheduled for March 2021.

The supplier of the Havhingsten cable is Alcatel Submarine Networks (ASN). Intertek are the environmental and permitting consultants.

The entire cable system will comprise marine elements that pass from Denmark to the UK (NE region); from the UK (NW) to the Republic of Ireland; with two segments being installed into landfalls on the Isle of Man. 

The cable route in the NE region is shown below. Landfall was made at Seaton Sluice.

Installation was via industry standard burial tools including water jetting and ploughing. Cable burial has been performed to a target of 2m.

The Havhingsten cable crosses 4 pipelines within the UK North Sea, which will require external rock protection. Post-rock installation is now expected in March 2021. The cable crossings start at approximately 72km offshore and beyond.

Prior to rock placement there is a maximum of 50m of cable surface laid with Uraduct protection at each of the 4 crossings. Coordinates of the crossings are provided in the table below. It is advised that extra care is taken when vessels are operating near these areas and that no vessel should trawl within 250m from the listed coordinates.

Following 2 recent faults (caused by impact damage) in the same area and subsequent repairs to the BritNed HVDC Interconnector, the latest completed on 07/06/21, the repaired section although trenched, is still in the process of natural backfill and areas of exposure remain. A guard vessel (currently M/V FORTUNA) remains on site. 

We wish to remind ship’s captains of the presence of subsea cables and request that extra caution is exercised when operating near charted cables in order to avoid any incident. Due to changing seabed conditions it should not be assumed that all cables are buried.

10 mooring line trenches, varying in length from 70m to 180m; up to 8 metres wide and up to 9 metres deep. These trenches are steep-sided (in many cases vertical, cut into the clay seabed).

10 anchor scars, consisting of shallow trenches (20-90 metres long), shallow-sided depressions (less than 2 metres deep) but with areas of significantly disturbed seabed, including clay boulders up to 3 metres in size.

A north cardinal buoy is now in position 75m north of the cable loop on the following location and display a very quick flashing white light.

The marker buoy will remain in position until July 2022 when cable replacement works are planned to be completed by.

Note fishing has been observed over subsea infrastructure including 40m L x 35m W x 11H Template structure that is within a 500m Safety zone.

The safety zone is to protect all parties and is a legally restricted area that can only be entered under Special Circumstances;

             1. To attempt to save a life or property,

             2. Owing to bad weather ,

             3. When in distress.

All vessels including fishing vessels must not fish within or transit over the 500m safety zone.

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The Northern Producer FPF has been removed from it’s moorings and towed to port for decommissioning but the subsea assets within the Northern Producer FPF 500m zone will remain in place on the seabed and could pose a snag hazard to fishermen therefore the Thistle Alpha Platform ERRV will act as a guard vessel until the 500m zone clearance is performed in 2022.

This includes the 8 No Risers draped over the Mid Water Arch (MWA), the MWA Clumpweight Guide Frame, the Riser Base Structure (RBS) and the surface laid pipelines / Umbilicals.  The MWA will remain in the water column at a depth of 112m and will remain tethered to the seabed via the clumpweight guide frame. The risers will remain draped over the MWA with one end on the seabed and the other end will remain connected to the RBS so that they remain stable. The existing stabilisation mattresses will remain in place over the surface laid pipelines/umbilicals.

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The approximate dimensions of the Debris Cap is 4.5m x 3.9m x 1.4m with a weight of approximately 3.5 tonnes. It is not known whether the Debris Cap is lying within a 500m zone of the well. A 200m x 200m area centred on the well has been searched, with no sight of it. Therefore the exact location of the Debris Cap is unknown. The loss of the Debris Cap leaves the NW Schooner wellhead more vulnerable to snagging from trawler/fishing nets. The approximate size of the tree with over trawl legs deployed is 7.8m x 7.8m x 6m high.

Please be advised that two UXO targets have been confirmed within the Triton Knoll Offshore Wind Farm Array.

Mariners are advised that the two confirmed targets are located within 20 metres water depth (LAT) and a 10 metre radius exclusion zone is required around each target.  The following table provides the coordinates and a description for each target.

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There is no cable exposure evident in the South Field of the windfarm.

Details of Seabed - West Cluster

Note: 210m of 177mm dia. chain has been laid on seabed at each location towards the FPSO centre.

Details of Seabed - North East Cluster

Note: 210m of 177mm dia. chain has been laid on seabed at each location towards the FPSO centre.

Details of Seabed - Southern Cluster

Note: 30m pile is installed in this fast frame

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The topsides has been removed from the Ninian North installation, leaving the jacket structure still in place. The top of the structure is approximately 6 metres above sea level. With the removal of the topsides, the remaining jacket structure is unlit and is not fitted with any navaids; cardinal buoys are located to the East & West.

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Please be advised that the installation of the Tampnet fibre optic cable is still ongoing and that there is currently approximately 4.5km of EXPOSED CABLE on the seabed as per attached drawing. We advise all seafarers and fishermen to keep clear of using any bottom equipment that might interact and damage the cable in vincinity of the route. We are also broadcasting and raising awareness from land and nearby guard vessels to all fishermen approaching the cable route. The installation is expected to be ongoing until mid September. 

Detailed below, to avoid hazardous interaction with these sections of exposed pipeline, pending the execution of mitigation works.

The riser line was severed below the surface buoy and it has not been possible to recover the items. Investigations as to the cause of the loss are ongoing.

Possible risk of entanglement from remaining riser line.

The SONAR imagery acquired during the recovery attempt indicated the riser line (the main aspect of concern) to be still attached to the anchor weight and suspended in the lower part of the water column. Given the elapsed time, the line will be fully saturated and neutrally buoyant and fully submerged. It is anticipated that the action of tidal currents on the line will cause it to knock down and eventually become entangled in the frame and other gear. Whilst it has not been confirmed, it is unlikely that the line would remain close to the surface.

These boulders have seemingly been deployed in groups at different times, with notification via the UKHO.

Significant free-spans have been identified along the PL1043 Dunbar to Alwyn pipeline : Please exercise caution in these areas

No overtrawlability trial done yet, rough ground may be experienced.

After the decommissioning of the MacCulloch FPSO / Field in UKCS Block 15/24, a Guard Vessel is no longer in position. 

The Donan (Dumbarton) Field, located in UKCS Block 15/20, has an out of use Gas Export pipeline (PL2324) which is still connected to a Tie-In Skid located within the previous MacCulloch subsea 500m zone. 

Please be aware that this subsea Tie-In Skid remains in place at this location.  The structure has been notified and recorded on the NDR / FishSafe websites since 2006/07, but has been previously monitored by the guard vessel.

No overtrawlability trial done yet, rough ground may be experienced.

No overtrawlability trial done yet, rough ground may be experienced.

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This safety zone may be new, or an amendment to an existing zone. It may also replace a safety zone in place around a platform, or other surface structure for the purposes of decommissioning.

Your FishSAFE Information will be updated in the next release.

This safety zone may be new, or an amendment to an existing zone. It may also replace a safety zone in place around a platform, or other surface structure for the purposes of decommissioning.

Your FishSAFE Information will be updated in the next release.

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The drilling operation will be carried out by Noble Hans Deul drilling rig.   

Array Cable Seabed  Installation

Ørsted will be commencing pre-lay surveys and seabed preparation for array cable installation with the Simar Esperanca and rock deployment with the Flintstone on or around 21st March 2021, shortly followed by array cable installation itself on or around 15th April 2021. In addition to this, Seaway Offshore Cables (SOC) and Sulmara may be trialling an autonomous survey vessel within the Hornsea Project Two array area which will be supported by a dedicated support vessel, queries related to this scope should be directed to SOC / Sulmara.

Works will be continual and intermittent throughout this period. The works will be undertaken by a number of vessels at different times according to the Project schedule. This Notice will be updated and re-issued when works are complete.

Note that the vessels will have limited manoeuvrability and it is requested that all vessels operating near the vessels maintain a safe distance (at least 500m) and pass all vessels at minimum speed.

Please be advised that construction activities are ongoing within the wind farm, supported by Crew Transfer Vessels (CTVs) and survey vessels intermittently. The Deep Cygnus will be mobilising to site as a support vessel to the ongoing construction works on or around 28th May 2021. The MHO Grimsby continues to carry out construction geophysical surveys intermittently utilising a hull-mounted system within the proposed Hornsea Project Two Offshore Wind Farm site and the Wind Innovation remains on the project for construction support.

It is requested that all vessels operating near the construction area keep a safe distance and pass at minimum speed.

Please be advised that Repsol Sinopec Resources UK Limited (RSRUK) intend to carry out subsea removal & remediation works in the Buchan & Hannay fields during Q2/Q3 this year, commencing on the 1st June 2021.

The intention is to execute this works over two campaigns: •    Campaign 1 – mobilising 1st June for approximately 20 days  •    Campaign 2 – mobilising 10th August for 40 days

Summary of the Offshore Scope, in accordance with the approved decommissioning programme is: •    Rigid pipelines removal (13.5km); •    Flexible Pipelines / Umbilical removal (15.6km); •    Subsea structures removal (215Te); •    Rigid tie-in spool-pieces removal (67Te); •    Flexible jumpers/umbilical jumpers removal (0.47km); •    Deposits removal (866Te); •    Debris removal (five grid zones); •    Rigid pipelines & Umbilical Ends remediation (1.45km of remediation).

This infrastructure is contained with the Buchan & Hannay fields, with a large proportion of the works being focused around the Buchan template 500m subsea safety zone.  The coordinates for the area are:   A small part of the works (2-3 days) will take place the Forties Charlie end of the Buchan export pipeline, within the Forties Charlie 500m zone.

The work will be carried out using Construction Support Vessel’s (CSV), support by WROV.  

Pipeline Works Authorisation variation and supporting permits are currently in the approval process.  

These vessels will be supported by the” Spectrum 1” call sign: 2CQX3 and” Dalby Tees” call sign: 2FIA7 carrying out crew transfer operations. Works are to take place at various locations across the London Array windfarm As part of this work, Dynamic Bend Stiffeners will be installed using, subsea installation tools and divers within the London Array Wind Farm. Vessel: C-Fenna C-Fenna Dive Support Vessel (DSV) has a length of 26.5m and breadth of 11.0m. The C-Fenna uses a four-point mooring system. The C-Fenna will undertake mooring deployment within 150m of the assigned WTG. Equipment will be periodically deployed and suspended from the vessel crane during the work.

Planned Diving Locations and Restricted Access Zones:

The works is expected to commence on the 1st of May 2021 and continue for approximately 6 months. During this period diving locations will be selected from the list of locations as detailed in Figure 1. A total of three locations could be operational at any one time. Information about what location is presently being worked will be transmitted over VHF informing all local vessels of restrictions.

Prior to commencing diving operations 4 chain clump weights mooring will be deployed at the required WTG location. These moorings will be positioned as required to avoid known obstruction and expected current flows but will be within 150m radius of the WTG. Once deployed a 150m exclusion zone will be placed around the WTG. The Mooring will consist of two 12t chain cluster weights connected to a surface buoy. A yellow light flashing yellow once every 5 seconds.

The Works shall comprise the location of the following mobile installation:

The mobile drilling unit (MoDU) - PR5 (Prospector 5)

The Works shall be located at:

57 10' 05.97"N 01 05' 27.27"E

Quad/Block - 22/21c

We will be deploying two scientific Acoustic Doppler Current Profilers on the sea bed for 6-12 months from May 2021 to collect currents data for environmental monitoring and hydrodynamic model validation.  The instruments have no surface markers and will be recovered using acoustic releases.  One of the instruments will be inside a low profile trawl-resistant frame (Little Minch, west of Skye) and one inside a steel frame (Loch Erisort).  See attachment for photos of the frames, a chart with their position and their positional details.

Partrac is to deploy two large metocean buoys (E03 and E13) at two separate locations approximately 18 miles northwest of Cromer and 28 miles north of Cromer in the southern North Sea 

Once deployed, please maintain a 500m exclusion around each buoy.

Deployment is estimated to be carried out over one day from the 5th May 2021, weather permitting.

The deployments will be completed by the vessel Isle of Jura.

The surface buoys will include: AIS; A day shape of yellow St Andrews Cross; radar reflector; and yellow navigation light.

The metocean buoys record meteorological data and are anchored to the seabed by means of a mooring chain and a ground weight. The buoy has dimensions of 4m x 4m, and when deployed the tallest mast on the buoy sits approx. 4m above the water line  

The subsea service company DeepOcean will perform a series of campaigns to prepare, install, commission and protect a new subsea drilling template on the Yme field development. The subsea activities will result in these subsea assets being temporarily exposed with a reduced level of overtrawlability. Trawling within a Caution area of radius 300m around 57°45' 21.669"N 004°22' 04.416"E(WGS 84) may potentially lead to injury, loss of trawling/ fishing equipment, and/or damage to DeepOcean and/or Repsol Norge AS assets.

The location will be marked by a virtual AIS buoy, monitored by the Equinor Marin radar surveillance, and by the Guard vessel Esvagt Corona during this period. Equinor Marin, the Esvagt Corona and Yme Platform Mærsk Inspirer will attempt to contact fishing vessels approaching the aforementioned location.

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The Flotel Safe Caledonia is alongside ELGIN PUQ – within 500m zone. Providing additional accommodation for ongoing fabric maintenance campaign.

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