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Unmanned submersible 'Hailong 11000' completes 1st sea test

Xinhua | Updated: 2018-03-31 11:21
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Photo taken on March 30, 2018 shows researchers examining the unmanned submersible "Hailong 11000" on the Chinese research vessel Dayang Yihao (Ocean No 1) in the western Pacific Ocean. [Photo/Xinhua]
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