China's new deep-sea manned submersible Fendouzhe (Striver) returned to south China's Hainan Province on Saturday morning onboard the scientific research ship Tansuo-1, after completing its ocean expedition. The ship Tansuo-1 berthed and anchored in Sanya at 8:30 a.m. Saturday. Fendouzhe set a national record by diving to a depth of 10,909 meters in the Mariana Trench at 8:12 a.m. on Nov. 10. During the expedition which started on Oct. 10, Fendouzhe successfully completed 13 dives, eight of which exceeded a depth of 10,000 meters. The expedition team overcame difficulties such as typhoons, rain and high temperatures, conducted multiple tests and obtained a batch of sediment, rock and seabed biological samples, according to the Ministry of Science and Technology.