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)
RIGHT BG
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)
