180311-N-LY160-368 BEAUFORT SEA (March 11, 2018) The Royal Navy hunter killer submarine HMS Trenchant (S 91) surfaces in the Arctic Circle in support of Ice Exercise (ICEX) 2018, March 11, 2018. ICEX 2018 is a five-week exercise that allows the 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 Michael H. Lee/Released)