Xuelong 2 crossed the prime meridian and entered the Western Hemisphere on Thursday. (Photos: Xinhua)

Photo taken on Jan. 29, 2020 shows iceberg seen from China's polar icebreaker Xuelong 2, or Snow Dragon 2, in the southern Ocean before Xuelong 2 crosses the prime meridian.

A team member of China's 36th Antarctic expedition team conducts research aboard China's polar icebreaker Xuelong 2, or Snow Dragon 2, on Jan. 30, 2020.

Photo taken on Jan. 29, 2020 shows iceberg seen from China's polar icebreaker Xuelong 2, or Snow Dragon 2, in the southern Ocean before Xuelong 2 crosses the prime meridian.

China's polar icebreaker Xuelong 2, or Snow Dragon 2, sails in the misty Southern Ocean on Jan. 30, 2020.