A group of four from Shanghai Jiao Tong University returned to land with China's research ship Tansuo-1 over the weekend after finishing their deep-sea research mission in the western Pacific Ocean.

Tansuo-1 returned to a port in Sanya City, south China's Hainan Province, on Sunday, after completing its deep-ocean expedition to the Mariana Trench.

During the 53-day expedition, which started on October 14, the China-built deep-sea manned submersible Fendouzhe (Striver) successfully completed 23 dives, six of which exceeded a depth of 10,000 meters.