Subsea Survey

We deliver cost-effective, flexible solutions using cutting edge technology for subsea cable surveys and balance of plant.

Our state-of-the-art subsea sea survey solutions, along with our long-standing partnership with Rovco, ensure that we can offer accurate, quality data for your project – saving you time and money in the long-run and offering a truly competitive advantage.

Our experienced, expert teams have years’ of experience in delivering subsea solutions for a variety of offshore industries, continually evolving our client-centric offering and utilising the latest innovations in the sector to hone our craft. With an emphasis on accurate, real-time data, and huge investment in groundbreaking subsea technology, we can support your business with pre-emptive maintenance and fault prediction along with in-depth seabed surveying and monitoring. Our solutions are designed to maximise asset availability, productivity and boost your business’ ROI.

State-of-the-art technology

We support our customers with quality, real-time data that helps inform their decision making

Save Time & Money on Surveys

Investment in intelligent data and technology allows customers to cut down on labour costs and get results faster

Safer Subsea Maintenance

ROVs can dive deeper and longer than traditional divers, making subsea repairs safer for everyone

Accurate Data Feedback

With machine learning from Rovco's Ocean Insight, we eradicate human error, ensuring data is pure

Subsea Survey Services & Solutions

In today’s environments, it’s more important than ever that all proper checks and subsea cable survey operations are carried out efficiently and effectively.

Not only can a post-installation survey be a requirement set out in the licence issued by the relevant Marine Authority, but it can also be a pre-requisite to confirm the desktop study and identify anomalies along the route corridor.

Post-installation monitoring surveys are also carried out periodically to understand how the cables and subsea structure are interacting with the seabed, minimise future threats and identify preventative action that can be implemented, improving reliability and reducing un-budgeted costs. We offer these survey solutions to energy developers and owners to provide a detailed insight into seabed conditions.

OUR SUBSEA CABLE SERVICES

Scour Monitoring
Scour condition monitoring and volume calculations are performed using high resolution multi-beam bathymetry MBES and side-scan sonar SSS surveys around WTG foundations. This is often where tidal currents have removed material which might compromise the security of foundations or exposed cables. 2D/3D images, maps and volumetric calculations of material moved are produced, at acquisition speeds of 3-4 knots.

Seabed Survey
The use of multi-beam and side-scan sonar surveys to detect cable exposure and measure depth of sediment cover over cable by comparison of seabed with previous surveys. Use of high resolution MBES digital terrain models, with highly accurate vertical correction for tides to monitor cable depth of cover without the use of ROVs. Acquisition speeds of 3-4 knots.

ROV Survey
Cable crossing condition, CPS protection monitoring and depth of burial verification surveys using ROV based tools such as TSS 440/350, Innovatum Smartrak or the Pangeo 3D Seismic system.

Benthic Survey Monitoring
Analysis of infauna (subsurface) sampled by grabs or cores and the epifauna (above surface) sampled by trawls or dredges, accompanied by the sub-sampling of sediments for analysis of particle size distributions and contaminant concentrations.

Our Key Capabilities

The CWind team works with our customers and partners to deliver a superior subsea cable survey solution, with the tools and expert knowledge to meet your requirements.

  • Assessing the burial status of the subsea cable and determining cable exposure/free-spanning or monitor existing exposures/spans
  • Identifying cable damage
  • Assessing the burial depth of the cable
  • Assessing scour in the vicinity of the substation
  • Assessing mobile sediment movement and sediment level changes (scour/erosion/accretion) from previous surveys
  • Updating the ground model to review sediment level changes and trends
  • Assessing the condition of existing remedial works
  • Identifying potential hazards in the vicinity of the cable and offshore substation
  • Monitoring identified sensitive habitats
  • Monitoring identified areas of archaeological interest
  • Reporting on maintenance works required
  • Providing seabed information in order to assess any third party compensation claims
  • Delivering consent compliance
  • Delivering third party pipeline, cable or other crossing agreement compliance

 

In partnership with our sister company Ocean iQ, we can provide a complete package of route engineering, subsea data and analysis, project management and a range of ROV subsea cable surveys.

 

Find out more

 

 

 

Invested Partnership with Rovco

Through our invested partnership with Rovco, a world-leading provider of ROV and hydrographic surveys using 3D and AI, CWind provide advancements to the offshore renewables industry through the continuous improvement of available and future-proofed digital technology.

Our invested partnership minimises risk to offshore personnel, through smarter ways of working, reducing the amount of time spent offshore. Additionally, we provide optimised, state-of-the-art live 3D vision technology to acquire accurate, high-quality data, delivered from a fleet of multi-purpose vessels and ROVs using highly experienced personnel.

Together, CWind and Rovco empower clients with an improved understanding of offshore wind assets, supporting industry leaders to make timely, informed decisions throughout the project lifecycle.

Utilising trend analysis, we can identify likely faults on subsea structures, as well as within the internal environment of the monopile. Applying our intelligence to support pre-emptive asset maintenance and fault prediction ensures effective asset management and maximised integrity – providing clients with peace of mind.

We offer a proactive approach to digital data management, utilising already deployed vessels to optimise existing offshore operations, maximise resource and add value to projects.

We have strategically located vessels, and technical knowledge, to deliver global subsea solutions, responding rapidly to meet client needs. As part of the Global Marine Group, CWind has a legacy of successful project delivery across multiple markets; continually evolving subsea cable survey solutions utilising engineering excellence and transferrable cross-market knowledge.

Most recently, CWind and Rovco have jointly carried out a successful subsea inspection campaign at the EA1 windfarm development, where Rovco’s SubSlam 3D technology proved to offer significant added value to the customer in developing 3D models of the subsea infrastructure.

Our Key Capabilities

  • Seabed scour survey
  • Subsea marine growth survey
  • Subsea screening inspection of primary and secondary steelwork
  • Subsea close inspection of primary and secondary steelwork
  • Cathodic protection potential survey
  • Detailed anode survey
  • Close visual inspection of the grouted connections
  • Inspection of the cable protection and route system
  • Inspection of Innovative Cable Protection System (Tektube)
  • Inspection of the J-tubes, cable protection and route system
  • Geophysical survey of the array cables corridor
  • Geophysical survey of the export cables corridor

Subsea cable survey with Rovco technology

All imagery courtesy of Rovco

THE INDUSTRY LEADER IN CTVs, PROJECT SERVICES AND OFFSHORE TRAINING

CWind Services

Cable Pull-In

Experienced technicians who can work quickly yet handle your precious array, export and PCC cable with care. Over 890 pull ins, as a group, to date.

Corrosion Protection

Full corrosion protection services, inspection, procurement, application and transportation to maximise asset lifetime

Temporary Power

Temporary power for turbines far out to sea allowing for smooth, uninterrupted construction and maintenance

Subsea Survey Solutions

Utilising the CTV fleet to undertake subsea surveys, a cost effective solution maximising the benefits of time on site

Topside Inspection, Maintenance and Repair

CWind has a robust track record of experience delivering Topside Inspections, Maintenance and Repair (IMR), utilising owned assets, best people and proven procedures, delivered through one interface

Subsea Inspection, Maintenance and Repair

Optimised, flexible solutions using cutting edge technology for Subsea Inspections, Maintenance and Repair (IMR) to meet customer requirements

Cable Termination & Testing

Optimising time, avoiding extra costs and ensuring safety requires planning and preparation, as well as technical, logistical and project management expertise.

Crew Transfer Vessel Charter

Transporting technicians quickly and safely, to and from site with a fleet of 17 vessels

Offshore Wind Training

One-stop accredited training centre offering bespoke courses to the on and offshore wind industry including confined space and rescue

Our Latest News:

Posted: 25/06/2021

Day of the Seafarer

Today and every day we appreciate our offshore colleagues, who work...

Posted: 19/04/2021

CWind Training announces plans to relocate to Grimsby

CWind Training, a leading provider of health and safety, offshore skills...

Posted: 06/04/2021

CWind completes campaign at Vattenfall’s Danish Kriegers Flak Offshore Wind Farm

CWind, a leading provider of project services, Crew Transfer Vessels (CTVs)...

Posted: 10/03/2021

CWind Completes Sale of Endeavour to Wood Marine as Part of CTV Fleet Upgrade Project

CWind, a leading provider of project services and Crew Transfer Vessels...

Posted: 23/02/2021

Blessing the CWind Pioneer

In February 2021, the CWind Pioneer was blessed at Wight Shipyard...

Posted: 23/02/2021

CWind Launches CWind Pioneer, the World’s First Hybrid Surface Effect Ship

CWind, a leading provider of project services, CTVs and GWO-accredited training...

Posted: 04/11/2020

CWind completes 2020 works at East Anglia ONE Windfarm

CWind, part of the Global Marine Group, has completed this year’s...

Posted: 21/10/2020

What is it like working for Global Marine Group?

Global Marine Group operates in what is traditionally seen as a...

Posted: 21/09/2020

Global Marine Group Launches OceanIQ Consultancy Business – utilising rich subsea data

Global Marine Group (GMG) a leading provider of subsea cable installation...

Posted: 25/08/2020

Ten years of CWind

From humble beginnings in a Brightlingsea shipyard, to an international company...

Posted: 25/08/2020

Vision of Offshore Renewables in 2030

THE NEXT DECADE Throughout its 10-year history, CWind, part of the...

Posted: 14/07/2020

Group Annual Awards 2020

We recently celebrated our annual awards to recognise some of the...

Posted: 14/07/2020

Why safety and flexibility are still key to efficient CTV operation

“If you’d told me at the start of 2020 that we’d...

Hybrid SES build pyramid
Posted: 14/06/2020

Adapting and collaborating with our supply chain partners to build the Hybrid SES

Building an innovative, first-of-a-kind vessel is challenging enough at the best...

Kentish Flats and CWind Tempest
Posted: 08/06/2020

OREAC: 1,400 GW of offshore wind is possible by 2050, and will be key for green recovery

The Ocean Renewable Energy Action Coalition (OREAC) is an initiative led...

Posted: 20/05/2020

Adapting to ensure a continuation of service during COVID-19

As the COVID-19 pandemic continues to affect businesses and individuals globally, like everyone,...

Posted: 14/05/2020

Maintaining Power in a Crisis

This is an excerpt of a longer in-depth article featured on...

CWind new vessel renders
Posted: 22/04/2020

CWind continues fleet expansion to enable robust maintenance of vital power networks

CWind, the offshore support services provider and part of the Global...

CWind Scottish Power Renewables EA1 offshore wind farm
Posted: 15/04/2020

Scottish Power Renewables announces CWind East Anglia One contract award

CWind is delighted to share Scottish Power Renewables’ latest press release...

Posted: 24/03/2020

Adapting to ensure a continuation of service: Our response to COVID-19

In light of recent developments and UK Government guidelines, we wanted...

Posted: 02/03/2020

J.F. Lehman & Company acquires Global Marine Group

Global Marine Group (“GMG” or the “Company”), a leading provider of...

Posted: 13/01/2020

Ocean Renewable Energy Action Coalition Launches to Accelerate Global Offshore Wind Capacity

An international Ocean Renewable Energy Action Coalition has been formed to...

Posted: 18/12/2019

Renewable energy’s rising stars win seats on RenewableUK’s new Shadow Board

CWind is pleased to share RenewableUK’s latest press release regarding the appointment...

Posted: 11/12/2019

Engineering the next steps on the path to zero-emissions CTVs

The zero-emissions goal is shared by many companies in the offshore...

Image of Paul Redpath, Project Manager at CWind
Posted: 21/11/2019

My life in offshore wind: Paul Redpath, Project Manager, CWind

As a relatively young industry, offshore wind attracts people from a...

Posted: 16/10/2019

CWind secures contract to deliver world’s first hybrid propulsion SES to Ørsted

CWind announced today a long-term charter contract agreement with Ørsted, delivering...

Posted: 15/07/2019

Global Marine Group to Ride 500km for corporate charities the JST and the Ninos Pag-Asa Orphanage

Next week, a team of 26 amateur and enthusiastic riders from...

Posted: 25/06/2019

Global Marine Group to Safeguard Ørsted’s UK Power Cables Under the Atlantic Cable Maintenance Agreement

Global Marine Group (GMG), supported by its business units Global Marine,...

Posted: 08/03/2019

Meet some of our inspirational ladies on International Women’s Day

In 2019, the focus of International Women’s Day is about balance....

Posted: 28/02/2019

Osbit to deliver next generation Subsea Plough to Global Marine Group

Osbit Limited, the offshore technology and engineering company, has secured a...

Posted: 04/02/2019

CWind Digitises Critical Operations With CrewSmart

CWind is pleased to share CrewSmart’s latest press release: Leading provider...

Posted: 29/01/2019

Rovco and Global Marine Group Enter Invested Partnership

Subsea technology company, Rovco has formed an invested partnership with Global...

ORE Catapult Levenmouth Turbine
Posted: 24/01/2019

CWind & ORE Catapult Drive UK Offshore Wind Technology Innovation

Chelmsford, Thursday 24th January 2019. CWind, part of the Global Marine...

Posted: 05/11/2018

Feature: RenewableUK array & export cables project intelligence report

Our Director of Power Cables, Andrew Lloyd, features as part of...

Posted: 23/10/2018

CWind Taiwan Completes Inaugural Contract at Yunlin Offshore Wind Farm

CWind Taiwan, a joint venture between CWind and International Ocean Vessel...

Posted: 15/10/2018

ASV Pioneer sails for her maiden project

A couple of weeks ago, the ASV Pioneer, part of our...

Posted: 24/09/2018

CWind to provide fast-response cable repair to Vattenfall’s European portfolio

CWind, a leading provider of power cable and asset management services...

Posted: 01/08/2018

Global Marine Group handed RoSPA Order of Distinction (19 consecutive Golds) Award for health and safety practices

Global Marine Group has been issued a prestigious award in recognition...

Posted: 24/07/2018

Nurturing the next generation of engineers

For the last couple of weeks, Megan, an A level student...

Posted: 05/07/2018

Global Marine Group to Ride 350km for corporate charity, the Jubilee Sailing Trust

Next week, a team of amateur and enthusiastic riders from Global...

Posted: 04/07/2018

Celebrating the successes of our people

At the end of June we held our Annual Awards Evening...

Posted: 14/05/2018

CWind to provide Complete Cable Care service to Transmission Capital Partners

CWind, a leading provider of power cable and asset management services...

Posted: 03/05/2018

CEO Today Magazine Announce Ian Douglas as a European Award Winner 2018

Ian Douglas Wins CEO Today Magazine European Awards CWind, part of...

Posted: 12/04/2018

Contract Awarded for Sub Sea Cable Replacement in Orkney Isles

CWind is pleased to share Scottish & Southern Electricity Networks’ latest press...

Posted: 10/04/2018

CWind launches new cable care service with dedicated cable repair barge

CWind, a leading provider of power cable and asset management services...

Posted: 29/03/2018

Key offshore wind players sign loI for GWO training centre in Taiwan

Our Joint Venture company, CWind Taiwan, signed a Letter of Intent...

Posted: 14/02/2018

Global Marine Group presented prestigious Shipowner of the Year Award by Offshore Support Journal

The Global Marine Group (GMG), a market leader in offshore engineering...

CWind Taiwan
Posted: 25/01/2018

CWind and International Ocean Vessel Technical Consultant form joint venture CWind Taiwan

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CWind: offshore engineering services
Posted: 20/12/2017

Global Marine Group announces new business unit ‘Global Offshore’ to serve the oil & gas sector

The Global Marine Group (GMG), a market leader in offshore engineering...

CWind: Offshore power market
Posted: 01/12/2017

Global Marine Group completes acquisition of Fugro’s trenching and cable lay business

Acquisition Further Positions Global Marine Group for Significant Offshore Power Market...

CWind: Offshore safety
Posted: 07/11/2017

Global Marine Group launches new Safety Management System

Global Marine Group (GMG) has launched a new Safety, Security and...

GM to grow as leading provider in renewables market
Posted: 12/10/2017

Global Marine Group to acquire Fugro’s trenching and cable laying business

Acquisition further positions company for significant offshore power market opportunities Chelmsford,...

Posted: 08/09/2017

CWind Awarded TP Gate Contract

Two DONG Energy offshore wind farms set to benefit from CWind...

Posted: 05/09/2017

Global Marine Group Awarded Order of Distinction from Royal Society for the Prevention of Accidents

Chelmsford, Tuesday 5 September 2017. The Global Marine Group (GMG), a market...

Global marine: offshore wind expansion
Posted: 31/08/2017

Global Marine Group Chooses Port of Blyth to Extend UK Footprint

Chelmsford, Thursday 31 August 2017. The Global Marine Group (GMG), a market...

GMG: Offshore wind farm
Posted: 17/08/2017

Global Marine Group Secures Cable Contract for Rampion Offshore Wind Farm

Chelmsford, Thursday 17 August 2017. Global Marine Group (GMG), a leading...

Posted: 08/08/2017

CWind Secures Major Cable Pull-in Contract at Merkur Offshore Wind Farm

Chelmsford, Tuesday 8 August 2017. CWind, a leading provider of services...

Posted: 03/08/2017

Utilising the Q1000, CS Recorder Completes Cable Reburial Project in Three Weeks

Chelmsford, Thursday 3 August 2017. Global Marine Group (GMG), a leading provider...

Posted: 03/08/2017

Global Marine Group to Ride Over 200 Miles for Children’s Charity Brainwave

Chelmsford, Wednesday 2 August 2017. Employees of the Global Marine Group (GMG),...

Posted: 03/07/2017

CWind Announces Two-Year Crew Transfer Vessel Extension on Key Offshore Wind Farm Project for Dong Energy

CWind, a leading provider of services to the offshore wind industry,...

Posted: 06/05/2017

Global Marine Group Reports Busy Spring Period

Heading into the summer months with resources engaged around the globe....

Posted: 02/05/2017

CWind Reaches Halfway Point of 15 Month Secondary Works Contract for Iberdrola’s Wikinger Offshore Wind Farm

CWind, a leading provider of services to the offshore renewables industry...

Posted: 25/04/2017

CWind Completes Vital Power Cable Repairs to Reconnect over 2,000 Scilly Islanders

CWind, a leading provider of services to the offshore renewables industry...

Posted: 16/02/2017

CWind Invests in Largest Crew Transfer Vessel to Date

CWind, a leading provider of services to the offshore wind industry,...

Posted: 14/02/2017

Introducing power cable capabilities to the CWind service scope

Positioning ourselves to meet wider customer needs As you may have...

Posted: 13/02/2017

CWind to Deliver Global Marine’s Power Cable Capabilities

CWind, a leading provider of services to the offshore wind industry,...

Posted: 26/01/2017

CWind Supports Centrica Jack Up Operations from Grimsby Hub

CWind, a leading provider of services to the offshore wind industry,...

Posted: 04/01/2017

CWind Provides Crew Transfer Vessels for EON Blade Maintenance Work at Robin Rigg

CWind, a leading integrated service provider in the offshore wind industry,...

Posted: 08/12/2016

CWind provide CTVs for Siemens Blade Maintenance Campaign

CWind, a leading provider of services to the offshore wind industry,...

Posted: 05/12/2016

CWind Provides ROV Subsea Inspections for E.ON at Amrumbank West

CWind, a leading provider of services to the offshore wind industry,...

Posted: 22/11/2016

CWind Wins Contract To Undertake Secondary Works For Geosea At Galloper Offshore Wind Farm

CWind, a leading provider of services to the offshore wind industry,...