Aerial photo taken on Dec. 24, 2019 shows members of China's 36th Antarctic expedition team retrieving a profiler on China's polar icebreaker Xuelong 2. China's polar icebreakers Xuelong and Xuelong 2 will conduct scientific researches in the Southern Ocean. (Photos: Xinhua)

Aerial photo taken on Dec. 24, 2019 shows members of China's 36th Antarctic expedition team working on China's polar icebreaker Xuelong 2.

Aerial photo taken on Nov. 21, 2019 shows China's polar icebreakers Xuelong 2 (R) and Xuelong at an area close to China's Zhongshan Station.

Aerial photo taken on Dec. 24, 2019 shows China's polar icebreaker Xuelong 2 in the Cosmonauts Sea.