The Royal Navy hunter killer submarine HMS Trenchant (S 91) surfaces in the Beaufort Sea during Ice Exercise (ICEX) 2018. ICEX is a five-week exercise that allows the U.S. Navy to assess its operational readiness in the Arctic, increase experience in the region, advance understanding of the Arctic environment and continue to develop relationships with other services, allies and partner organizations. (U.S. Navy photo by Mass Communication 2nd Class Micheal H. Lee/Released)
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