The bow of the Finnish icebreaker MSV Nordica pushes down sea ice as it sails through the Victoria Strait while traversing the Arctic's Northwest Passage, Friday, July 21, 2017. The MSV Nordica is equipped with several heavy-duty engines and a hardened bow and hull that allow it either to drive through thin layers of ice or to crush thicker sheets by rising onto the ice with the help of its rounded hull. The ship's massive weight breaks the ice from above. (AP Photo/David Goldman)
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