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China's manned submersible Shenhai Yongshi (Deep Sea Warrior) returns to the oceanic research vessel Tansuo-1 in South China Sea, May 20, 2018. The submersible Deep Sea Warrior returned to the oceanic research vessel Tansuo-1 on Sunday morning after carrying out a night dive of about 1,400 meters deep in the Haima Cold Seep area in the Pearl River mouth basin in the South China Sea. (Xinhua/Zhang Jiansong)
