In this photo provided by China's Xinhua News Agency, Chinese icebreaker Xuelong, or Snow Dragon, is harbored in Shanghai, after an 85-day scientific quest across the Arctic ocean, Thursday, Sept. 27, 2012. The Chinese icebreaker has docked at Shanghai after becoming the first Chinese vessel to cross the Arctic Ocean. (AP Photo/Xinhua, Pei Xin) NO SALES

Associated Press
In this photo provided by China's Xinhua News Agency,  Chinese icebreaker Xuelong, or Snow Dragon, is harbored in Shanghai,  after an 85-day scientific quest across the Arctic ocean, Thursday, Sept. 27, 2012.  The Chinese icebreaker has docked at Shanghai after becoming the first Chinese vessel to cross the Arctic Ocean. (AP Photo/Xinhua, Pei Xin) NO SALES
In this photo provided by China's Xinhua News Agency, Chinese icebreaker Xuelong, or Snow Dragon, is harbored in Shanghai, after an 85-day scientific quest across the Arctic ocean, Thursday, Sept. 27, 2012. The Chinese icebreaker has docked at Shanghai after becoming the first Chinese vessel to cross the Arctic Ocean. (AP Photo/Xinhua, Pei Xin) NO SALES
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