Unmanned boats conduct geological survey in Hainan
Jinghaihong, an unmanned boat, conducts a geological survey off the coast of Sanya, Hainan province, on Oct 23, 2017. [Photo/Xinhua] |
Jinghaihong, an unmanned boat, conducts a geological survey off the coast of Sanya, Hainan province, on Oct 23, 2017. [Photo/Xinhua] |