Children present their paintings and flowers to members of China's research vessel Xuelong, or "Snow Dragon," leaves the port of Qingdao Olympic Sailing Center for its fifth Arctic expedition in Qingdao, East China's Shandong province, July 2, 2012. Xuelong, an A-2 class icebreaker capable of breaking ice 1.2 meters thick, is estimated to travel over 17,000 nautical miles during its 90-day voyage. It is scheduled to return to Shanghai on Sept. 29. (Xinhua/Yu Fangping)

Researchers and sailors of China's research vessel Xuelong, or "Snow Dragon," leaves the port of Qingdao Olympic Sailing Center for its fifth Arctic expedition in Qingdao, East China's Shandong province, July 2, 2012. Xuelong, an A-2 class icebreaker capable of breaking ice 1.2 meters thick, is estimated to travel over 17,000 nautical miles during its 90-day voyage. It is scheduled to return to Shanghai on Sept. 29. (Xinhua/Yu Fangping)