Master Mariner Jyri Viljanen, left, captain of the Finnish icebreaker MSV Nordica and Chief Officer Harri Venalainen, navigate from the bridge through ice floating on the Chukchi Sea off the coast of Alaska while traversing the Arctic's Northwest Passage, Sunday, July 16, 2017. More than a century has passed since the first successful transit of the treacherous, ice-bound Northwest Passage by Norwegian explorer Roald Amundsen in 1906. (AP Photo/David Goldman)
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