The photo shows the subsea support vessel Maersk Installer on Oct 16, 2017. [Photo/VCG]

The shipyard of the COSCO Shipping Heavy Industry Co Ltd in Dalian, Northeast China's Liaoning province delivered the first of four subsea support vessels to its buyer, Danish Maersk Supply Service on Monday.

It is the first time for a Chinese shipyard to undertake a Maersk offshore project. It is also the first ultra deepwater sea vessel for a Chinese shipyard to export.

Maersk Supply Service has ordered four subsea support vessels, with options for two more, from the Chinese shipbuilder in 2014.

Maersk Installer has become the first vessel of its kind exported by a Chinese shipbuilder. It is 137.6 meters long, 27 meters wide and 11 meters tall, having a deck area of 1,850 square meters. Its displacement reached 9,788 tons.

"This magnificent ship is by far the largest, most expensive and sophisticated vessel Maersk Supply Service has ever ordered or taken delivery of in our 50-year long history," said Peter Kragh Jacobsen, chief technical officer of Maersk Supply Service.

The vessel can carry out module replacement and inspection to facilities at 3,000 meters below the surface, as well as subsea construction work and offshore lifting operations.