China's first independently-developed ultra-deepwater gas field, Shenhai-1, or Deep Sea No.1, has recorded an accumulated natural gas output of over 8 billion cubic meters so far, with its oil output exceeding 800,000 cubic meters.

The deepest in China, the Shenhai Yihao ultra-deepwater gas field began operation on June 25, 2021.

According to the China National Offshore Oil Corporation, its operator, the construction of phase II of the project - Deep Sea No. 1, which aims to upgrade the gas field, is underway. Upon completion, it will control 23 deep-water gas wells and two sets of underwater production systems.

Deep Sea No.1, located 150 km from the city of Sanya in south China's island province of Hainan, can operate at a depth of over 1,500 meters in the ocean.