First officer Jukka Alhoke sits at the controls of the Finnish icebreaker MSV Nordica as it sets sail off the coast of Canada toward the Bering Strait, Thursday, July 6, 2017. The MSV Nordica is setting course to traverse the Northwest Passage, a route once considered impassible, from the Pacific ocean to the Atlantic via the Arctic. The icebreaker, which is returning to its home port of Helsinki, is carrying researchers studying the impact of the Arctic's melting sea ice on the fragile social and ecological balance in the region, and observers from the U.S. and Canadian Coast Guards. (AP Photo/David Goldman)
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