Scientific researchers make preparation for the first experimental operation of the country's self-developed underwater robot in the South China Sea, July 24, 2017. It is expected to stay underwater for 20 hours. (Xinhua/Zhang Xudong)
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Scientific researchers make preparation for the first experimental operation of the country's self-developed underwater robot in the South China Sea, July 24, 2017. It is expected to stay underwater for 20 hours. (Xinhua/Zhang Xudong)
