Photo taken on March 10, 2020 shows the manned submersible Shenhai Yongshi at Nanshan port in Sanya, south China's Hainan Province. China's science ship Tansuo-1 loaded with the manned submersible Shenhai Yongshi, or "deep-sea warrior," set sail Tuesday for the first scientific expedition this year for the missions of ocean resource exploration, geochemistry research and marine organism collection. (Xinhua/Guo Cheng)