A group of penguins are seen in this photo taken from aboard China's polar icebreaker Xuelong 2 in Antarctica water on Nov. 19, 2019. China's icebreakers Xuelong 2 and Xuelong are carring out the country's 36th Antarctic expedition. (Xinhua/Liu Shiping)

A group of penguins are seen as China's polar icebreaker Xuelong sails in Antarctica water, in this photo taken from aboard icebreaker Xuelong 2 on Nov. 19, 2019. The two vessels are carring out China's 36th Antarctic expedition. (Xinhua/Liu Shiping)

A group of penguins are seen as China's polar icebreaker Xuelong sails in Antarctica water, in this photo taken from aboard icebreaker Xuelong 2 on Nov. 19, 2019. The two vessels are carring out China's 36th Antarctic expedition. (Xinhua/Liu Shiping)

China's polar icebreakers Xuelong 2 (front) and Xuelong sail in Antarctica water in this aerial photo taken on Nov. 19, 2019. The two vessels are carring out China's 36th Antarctic expedition. (Xinhua/Liu Shiping)

China's polar icebreaker Xuelong 2 sails in Antarctica water in this aerial photo taken on Nov. 19, 2019. China's icebreakers Xuelong 2 and Xuelong are carring out the country's 36th Antarctic expedition. (Xinhua/Liu Shiping)