Canadian ice navigator, David "Duke" Snider shows the route the Finnish icebreaker MSV Nordica will navigate on a map of current sea ice conditions as the ship sails north in the Bering Sea Tuesday, July 11, 2017. 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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