180414-N-LW591-053 GROTON, Conn. (April 14, 2018) The Royal Navy hunter killer submarine HMS Trenchant (S-91) approaches the pier at Naval Submarine Base New London for a port visit. The British submarine is returning from Ice Exercise 2018, and operated alongside the Los Angeles-class fast-attack submarine USS Hartford (SSN-768) and the Seawolf-class fast-attack submarine USS Connecticut (SSN-22). (U.S. Navy photo by Mass Communication Specialist First Class Steven Hoskins/Released)