A transparent passenger submersible, Huandao Jiaolong 1, is put into trial operation in the open sea of Yalong Bay, Sanya, south China's Hainan province on Dec. 14, 2015. (Photo/Xinhua)
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A transparent passenger submersible, Huandao Jiaolong 1, is put into trial operation in the open sea of Yalong Bay, Sanya, south China's Hainan province on Dec. 14, 2015. (Photo/Xinhua)
