Chinese icebreaker Xuelong, or Snow Dragon, returns to the Prydz Bay, adjacent to China’s Zhongshan Station, after rounding off its second tour around Antarctica, Feb 27, 2016. The 75-day trip of over 18,000 nautical miles was also the research vessel’s first counterclockwise voyage around the ice-covered continent. [Photo/Xinhua]

Researchers on the Chinese icebreaker Xuelong, or Snow Dragon, take photos as the research vessel arrives at the sea area of the Prydz Bay after rounding off its second tour around Antarctica, Feb 27, 2016. The 75-day trip of over 18,000 nautical miles was also the research vessel’s first counterclockwise voyage around the ice-covered continent. [Photo/Xinhua]