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/Zhu Jichai)
