Icebreaker Xuelong, or "Snow Dragon," berthes at its home port after a two-and-a-half-month mission, in Shanghai, east China, Sept. 23, 2014. Xuelong set out from Shanghai on July 11 and has since traveled some 22,000 km to explore key areas such as the Bering Sea, the Chukchi Sea and the Canada Basin. It traveled as far as 81.11 degrees north latitude and 156.30 degrees east longitude, the team said. (Xinhua/Ding Ting)