Ship advances deep-sea salvage rescue work

China's largest submersible-support vessel was delivered and put into service on Monday in Qingdao, Shandong province, marking a breakthrough in the development of the country's deep-water salvage force, officials said.

The Shenqianhao is the nation's most advanced submersible-support vessel, capable of completing submarine rescue and lifting missions as well as other underwater projects, according to a statement from the rescue and salvage bureau under the Ministry of Transport.

The ship was built by Wuchang Shipbuilding Industry and will be managed by Shanghai Salvage Co, which is affiliated with the bureau.

The vessel is equipped with a deep-water saturation diving system, which allows 12 divers to work in turns at a depth of 300 meters — 100 meters deeper than in the past, said Shen Hao, director of Shanghai Salvage Co.

The system has living capsules, adapter modules and other life support facilities, the statement said. It allows divers to live in an enclosed pressurized environment before they enter the water.

A diving bell then takes three divers at a time into deep waters to carry out underwater operations, and returns them to the living capsule to change shifts.

The divers can be decompressed to surface pressure only once — at the end of their tour of duty. The process, known as saturation diving, enables divers to work uninterrupted in deep waters for long periods without the risk of decompression sickness.

Saturation diving technology is widely used in underwater operations performed in waters more than 120 meters deep or that require divers to stay in the sea for more than one hour.

The technology is different from that of the Jiaolong, the Chinese manned deep-sea research submersible that can dive to a depth of more than 7,000 meters.

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