U.S. Coast Guard divers observe a routine exercise through a diving tank window at the National Oceanic and Atmospheric Administration diving facility in Seattle, Feb. 10, 2010. The diving tank training is only one part of the annual Cold Water Ice Diving Course that is being held in Seattle and Diamond Lake, which is approximately 40 miles north of Spokane, Wash. U.S. Coast Guard photo by Petty Officer 3rd Class Nathan W. Bradshaw.
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