The Xuelong 2 finished unloading supplies for the Great Wall station and left for Ross Sea. (Photos: Xinhua)

Aerial photo taken on Feb. 14, 2020 shows members of China's 36th Antarctic expedition using a barge to transfer fuel from China's polar icebreaker Xuelong 2, or Snow Dragon 2, to the Great Wall station.

Aerial photo taken on Feb. 8, 2020 shows members of China's 36th Antarctic expedition transfering the waste of the Great Wall station to polar icebreaker Xuelong 2, or Snow Dragon 2, to dispose them in China.

Members of China's 36th Antarctic expedition aboard China's polar icebreaker Xuelong 2, or Snow Dragon 2, unload fuel at the Great Wall station, Feb. 10, 2020.

Aerial photo taken on Feb. 13, 2020 shows members of China's 36th Antarctic expedition using a barge to transfer fuel from China's polar icebreaker Xuelong 2, or Snow Dragon 2, to the Great Wall station.

Aerial photo taken on Feb. 14, 2020 shows China's polar icebreaker Xuelong 2, or Snow Dragon 2, near the Great Wall station.

Aerial photo taken on Feb. 13, 2020 shows members of China's 36th Antarctic expedition using a barge to transfer fuel from China's polar icebreaker Xuelong 2, or Snow Dragon 2, to the Great Wall station.

Aerial photo taken on Feb. 14, 2020 shows members of China's 36th Antarctic expedition using a barge to transfer fuel from China's polar icebreaker Xuelong 2, or Snow Dragon 2, to the Great Wall station.

Members of China's 36th Antarctic expedition aboard China's polar icebreaker Xuelong 2, or Snow Dragon 2, unload supplies at the Great Wall station, Feb. 8, 2020.

Aerial photo taken on Feb. 14, 2020 shows members of China's 36th Antarctic expedition using a barge to transfer fuel from China's polar icebreaker Xuelong 2, or Snow Dragon 2, to the Great Wall station.