Photo taken on Jan. 7, 2020 shows the fish samples obtained by China's 36th Antarctic expedition team aboard China's polar icebreaker Xuelong 2, or Snow Dragon 2, in the Cosmonauts Sea. (Xinhua/Liu Shiping)

Aerial photo taken on Dec. 27, 2019 shows members of China's 36th Antarctic expedition team aboard China's polar icebreaker Xuelong 2, or Snow Dragon 2, retrieving the trawl used for collecting krill samples in the Cosmonauts Sea. (Xinhua/Liu Shiping)

China's polar icebreaker Xuelong 2, or Snow Dragon 2, heads for Cape Town of South Africa on Jan. 20, 2020. (Xinhua/Liu Shiping)

Aerial photo taken on Dec. 20, 2019 shows China's polar icebreaker Xuelong 2, or Snow Dragon 2, conducting scientific researches in the Cosmonauts Sea. (Xinhua/Liu Shiping)

Members of China's 36th Antarctic expedition team process benthos samples aboard China's polar icebreaker Xuelong 2, or Snow Dragon 2, on Jan. 7, 2020. (Xinhua/Liu Shiping)

Photo taken on Jan. 7, 2020 shows the marine animal samples collected by China's 36th Antarctic expedition team aboard China's polar icebreaker Xuelong 2, or Snow Dragon 2, in the Cosmonauts Sea. (Xinhua/Liu Shiping)

Photo taken on Jan. 7, 2020 shows the zooplankton samples obtained by China's 36th Antarctic expedition team aboard China's polar icebreaker Xuelong 2, or Snow Dragon 2, in the Cosmonauts Sea. (Xinhua/Liu Shiping)

Members of China's 36th Antarctic expedition retrieving trawls to collect zooplankton samples aboard China's polar icebreaker Xuelong 2, or Snow Dragon 2, in the Cosmonauts Sea on Dec. 11, 2019. (Xinhua/Liu Shiping)

Members of China's 36th Antarctic expedition retrieving trawls to collect fish samples aboard China's polar icebreaker Xuelong 2, or Snow Dragon 2, in the Cosmonauts Sea on Jan. 1, 2020. (Xinhua/Liu Shiping)

Members of China's 36th Antarctic expedition team drop a trawl to collect benthos samples aboard China's polar icebreaker Xuelong 2, or Snow Dragon 2, Jan. 7, 2020. (Xinhua/Liu Shiping)

Penguins are seen on floating ice in the Cosmonauts Sea on Dec. 20, 2019. (Xinhua/Liu Shiping)