The Finnish icebreaker MSV Nordica leaves a wake after sailing through sea ice floating on the Victoria Strait while traversing the Arctic's Northwest Passage, Friday, July 21, 2017. The AP is accompanying a group of international researchers is sailing into the Arctic Sea aboard the Finnish icebreaker to traverse the Northwest Passage and record the environmental and social changes that are taking place in one of the most forbidding corners of the world. (AP Photo/David Goldman)
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