Crew members check China's manned deep-sea submersible Jiaolong in Sanya

Staff members of Sanya Maritime Safety Administration check the anchorage of "Xiangyanghong 09", carrier of China's manned deep-sea submersible Jiaolong, in Sanya, south China's Hainan Province, April 8, 2017. The crew of China's 38th ocean scientific expedition returned to Sanya, Hainan Province, south China, Wednesday. The 59-day trip marks the conclusion of the first stage of a 124-day mission. [Photo: Xinhua/Zhao Yingquan]

Crew members check China's manned deep-sea submersible Jiaolong in Sanya, south China's Hainan Province, April 8, 2017. The crew of China's 38th ocean scientific expedition returned to Sanya, Hainan Province, south China, Wednesday. The 59-day trip marks the conclusion of the first stage of a 124-day mission. [Photo: Xinhua/Zhao Yingquan]

Workers of Sanya Maritime Safety Administration and captain of "Xiangyanghong 09", carrier of China's manned deep-sea submersible Jiaolong, check the anchorage on a map in Sanya, south China's Hainan Province, April 8, 2017. The crew of China's 38th ocean scientific expedition returned to Sanya, Hainan Province, south China, Wednesday. The 59-day trip marks the conclusion of the first stage of a 124-day mission. [Photo: Xinhua/Zhao Yingquan]

Crew members check China's manned deep-sea submersible Jiaolong in Sanya, south China's Hainan Province, April 8, 2017. The crew of China's 38th ocean scientific expedition returned to Sanya, Hainan Province, south China, Wednesday. The 59-day trip marks the conclusion of the first stage of a 124-day mission. [Photo: Xinhua/Zhao Yingquan]

"Xiangyanghong 09", carrier of China's manned deep-sea submersible Jiaolong, is seen in Sanya, south China's Hainan Province, April 8, 2017. The crew of China's 38th ocean scientific expedition returned to Sanya, Hainan Province, south China, Wednesday. The 59-day trip marks the conclusion of the first stage of a 124-day mission. [Photo: Xinhua/Zhao Yingquan]