A walrus is seen by the Coast Guard Cutter Maple (WLB 207) crew underway on their historic voyage up through the Northwest Passage in the Beaufort Sea, Alaska, July 22, 2017. Cutter Maple and crew assisted a research scientist with the collection of zooplankton to analyze the abundance of bowhead whale's food source. U.S. Coast Guard photo by Petty Officer 2nd Class Nathan Littlejohn.