In this Monday, July 10, 2017 photo, ice navigator Capt. David "Duke" Snider, from left, Canadian Coast Guard Capt. Victor Gronmyr, U.S. Coast Guard Cmdr. Bill Woityra, assistant ice navigator Nigel Greenwood, and biologist Paula von Weller talk over dinner in the mess hall aboard the Finnish icebreaker MSV Nordica as it sails the North Pacific Ocean to traverse the Northwest Passage through the Canadian Arctic Archipelago. (AP Photo/David Goldman)
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