China's self-developed underwater robot is prepared to dive during its first experimental operation in the South China Sea on July 24, 2017.
Xinhua丨Updated: July 25, 2017
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China's self-developed underwater robot is prepared to dive during its first experimental operation in the South China Sea on July 24, 2017. It is expected to stay underwater for 20 hours. (Xinhua/Zhang Xudong)