China's icebreakers Xuelong and Xuelong 2 at area close to China's Zhongshan Station(1/5)

Aerial photo taken on Dec. 1, 2019 shows China's icebreakers Xuelong and Xuelong 2 at an area close to China's Zhongshan Station in Antarctica. (Xinhua/Liu Shiping)

Aerial photo taken on Dec. 1, 2019 shows China's icebreakers Xuelong and Xuelong 2 at an area close to China's Zhongshan Station in Antarctica. (Xinhua/Liu Shiping)

Aerial photo taken on Dec. 1, 2019 shows China's icebreakers Xuelong and Xuelong 2 at an area close to China's Zhongshan Station in Antarctica. (Xinhua/Liu Shiping)

Aerial photo taken on Dec. 1, 2019 shows China's icebreakers Xuelong and Xuelong 2 at an area close to China's Zhongshan Station in Antarctica. (Xinhua/Liu Shiping)

Aerial photo taken on Dec. 1, 2019 shows China's icebreakers Xuelong and Xuelong 2 at an area close to China's Zhongshan Station in Antarctica. (Xinhua/Liu Shiping)