China's unmanned submersible Qianlong III makes its first dive into the sea from the Chinese research vessel Dayang Yihao (Ocean No. 1), in the early morning on April 20, 2018. (Xinhua/Liu Shiping)
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China's unmanned submersible Qianlong III makes its first dive into the sea from the Chinese research vessel Dayang Yihao (Ocean No. 1), in the early morning on April 20, 2018. (Xinhua/Liu Shiping)
