Photo taken on May 12, 2021 shows the Deep Sea No.1 deep-water gas field, 150 kilometers off the city of Sanya in south China's Hainan Province. Deep Sea No.1, China's first self-operated 1,500-meter deep-water gas field, started production on Friday, according to the China National Offshore Oil Corporation (CNOOC). (Xinhua/Pu Xiaoxu)
