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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.


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




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. 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


CWind Services

Corrosion Protection

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

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

Crew Transfer Vessel Charter

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

Our Latest News:

Posted: 11/10/2023

CWind Enters New Chapter with Acquisition by Inspirit Capital, Strengthening Commitment to Offshore Wind Industry

CWind, a leading provider of offshore wind support services, today announced...

Posted: 04/11/2021

Next generation CTVs arrive to help combat emissions

CWind has worked with naval architects to develop the world’s first...

Posted: 24/09/2021

Protect, Preserve, Repair: reducing the cost of offshore wind through proactive maintenance, inspection, protection and repair

Ambitious environmental targets from governments around the world, including Germany’s 20GW...

Posted: 02/08/2021

World’s First Hybrid-Powered Surface Effect Ship Classed by Bureau Veritas

Bureau Veritas (BV), a world leader in testing, inspection, and certification...

Posted: 25/06/2021

Day of the Seafarer

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

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: 04/11/2020

CWind completes 2020 works at East Anglia ONE Windfarm

CWind, has completed this year’s campaign as part of their East...

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, has been at...

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...

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...

CWind new vessel renders
Posted: 22/04/2020

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

CWind has continued with its fleet development and expansion plans by...

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: 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: 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: 04/02/2019

CWind Digitises Critical Operations With CrewSmart

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

ORE Catapult Levenmouth Turbine
Posted: 24/01/2019

CWind & ORE Catapult Drive UK Offshore Wind Technology Innovation

Thursday 24th January 2019. CWind, a leading provider of topside, splash...

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: 08/09/2017

CWind Awarded TP Gate Contract

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

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: 03/07/2017

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: 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: 16/02/2017

CWind Invests in Largest Crew Transfer Vessel to Date

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,...