Team members of China's 36th Antarctic expedition work on China's polar icebreaker Xuelong 2 in the Cosmonauts sea, Dec. 8, 2019. This is the first time for China's Antarctic expedition members to explore the Cosmonauts sea. (Xinhua/Liu Shiping)

Team members of China's 36th Antarctic expedition work on China's polar icebreaker Xuelong 2 in the Cosmonauts sea, Dec. 8, 2019. This is the first time for China's Antarctic expedition members to explore the Cosmonauts sea. (Xinhua/Liu Shiping)

Team members of China's 36th Antarctic expedition work on China's polar icebreaker Xuelong 2 in the Cosmonauts sea, Dec. 9, 2019. This is the first time for China's Antarctic expedition members to explore the Cosmonauts sea. (Xinhua/Liu Shiping)