Photo taken on Jan. 3, 2013 shows an iceberg in the way of the Chinese icebreaker Xuelong's (Snow Dragon) evacuation route in a sea-ice field off Antarctica, Jan. 3, 2014. Xuelong is blocked by thick ice after successfully transferred passengers aboard stranded Russian science vessel MV Akademik Shokalskiy Thursday. (Xinhua/Zhang Jiansong) 

The Chinese icebreaker Xuelong, or Snow Dragon, anchors in a sea-ice field off Antarctica, Jan. 3, 2014. Xuelong is blocked by thick ice after successfully transferred passengers aboard stranded Russian science vessel MV Akademik Shokalskiy Thursday. (Xinhua/Zhang Jiansong)

The Chinese icebreaker Xuelong, or Snow Dragon, anchors in a sea-ice field off Antarctica, Jan. 3, 2014. Xuelong is blocked by thick ice after successfully transferred passengers aboard stranded Russian science vessel MV Akademik Shokalskiy Thursday. (Xinhua/Zhang Jiansong)

The Chinese icebreaker Xuelong, or Snow Dragon, anchors in a sea-ice field off Antarctica, Jan. 3, 2014. Xuelong is blocked by thick ice after successfully transferred passengers aboard stranded Russian science vessel MV Akademik Shokalskiy Thursday. (Xinhua/Zhang Jiansong)

The Chinese icebreaker Xuelong, or Snow Dragon, anchors in a sea-ice field off Antarctica, Jan. 3, 2014. Xuelong is blocked by thick ice after successfully transferred passengers aboard stranded Russian science vessel MV Akademik Shokalskiy Thursday. (Xinhua/Zhang Jiansong)

The Chinese icebreaker Xuelong, or Snow Dragon, anchors in a sea-ice field off Antarctica, Jan. 3, 2014. Xuelong is blocked by thick ice after successfully transferred passengers aboard stranded Russian science vessel MV Akademik Shokalskiy Thursday. (Xinhua/Zhang Jiansong)

The Chinese icebreaker Xuelong, or Snow Dragon, anchors in a sea-ice field off Antarctica, Jan. 3, 2014. Xuelong is blocked by thick ice after successfully transferred passengers aboard stranded Russian science vessel MV Akademik Shokalskiy Thursday. (Xinhua/Zhang Jiansong)