The Magazine for Underwater Professionals

Mar/Apr 2018


Autonomous surface vessel deployed in Subsea 7 Mediterranean operation

C-Worker 7 ASV successfully utilised to support pipelay operation off the coast of Egypt

Operating for a total of 37 days, the C-Worker 7 carried out touchdown monitoring in support of the 'Seven Antares' pipelay vessel

UK-based ASV Global has successfully deployed one of its C-Worker 7 autonomous surface vessels for subsea engineering, construction and services company Subsea 7. The seven-metre autonomous surface vessel was used to support a pipelay operation off the coast of Egypt.

Fitted with a survey suite comprising a multibeam echosounder and sidescan sonar, the C-Worker 7 carried out touchdown monitoring in support of the Seven Antares pipelay vessel.

According to Subsea 7, the C-Worker 7 proved to be a very capable vessel, “providing an excellent stable survey platform controlled by the pipelay vessel”.

“We are delighted to be supporting Subsea 7 in their quest to increase operational efficiency through the use of autonomous surface vessel technology,” says Richard Daltry, technical director at ASV Global. “This operation marks a huge step in realising the potential of this technology and goes a long way to prove its operational readiness, particularly in a demanding offshore environment.”


The C-Worker 7 operated for a total of 37 days. Use of the vehicle replaced the need for an additional survey vessel, resulting in significant cost savings, says Daltry. The C-Worker 7 also provided greater operational flexibility due to its superior endurance and improved availability compared to an equivalent manned vessel, he adds.

A custom payload frame was designed to house the specified survey suite. The modular frame slotted into the C-Worker 7’s moon pool to mount and deploy the sensors. Extensive testing confirmed that repeated sensor deployment was achieved within millimetre accuracy ensuring that no further survey sensor calibrations were required. Vessel trials and testing took place in the Solent on England’s south coast before the vessel was mobilised from ASV’s UK headquarters.

Throughout the operation the C-Worker 7 was controlled and monitored using the ASView control system from a control station set up on board the Seven Antares. Subsea 7 survey personnel piloted the C-Worker 7 and operated the survey sensors to ensure data accuracy and quality.

  • The C-Worker 7 was controlled and monitored from a control station set up on board the 'Seven Antares'





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