7月24日，“探索”号即将进入水中。当日，我国自主研发的自治式水下机器人“探索”号在南海北部开展首次试验性应用，预计水下作业时间20小时。[新华社 张旭东 摄]
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)