This 2016 photo provided by the U.S. Navy, shows a submarine after breaking through ice in the Beaufort Sea off Alaska's north coast. The U.S. Navy has kicked off biennial submarine testing and training under sea ice off Alaska's north coast--the exercises are dubbed Ice Exercise 2018, or ICEX18, and will include maneuvers by three submarines under Arctic ice, including a British vessel, over five weeks. (U.S. Navy via AP)
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