On August 12, after eight months and nearly 30, 000 nautical miles, China's 49th oceanic scientific expedition successfully completed various missions. During the inspection, after nine submersible applications, the underwater robot "Dianlong II" once again broke the record of underwater operation of the robot.

As we all know, deep-sea operations are extremely difficult and dangerous. Underwater robots must have advanced technology to perform safe operations, and the "Dianlong II" has completed nearly 50 safe submersible operations before that. This shows the rapid development of underwater robots in China in recent years.