Connecticut received extensive overhauls from 2012 to 2017. She returned to operation in early 2018 and participated in the Arctic ICEX 2018 operational readiness exercise. She later that year deployed to the western Pacific before returning on 30 January 2019. From 26 March through 19 August 2019, Connecticut underwent maintenance and modernizing in a drydock at Puget Sound Naval Shipyard. The US$17 million project involved 30,000 worker days, and used a hull-climbing robot to inspect the ship's hull. The Navy plans to extend a submarine pier to moor Connecticut and together with at Naval Submarine Base Bangor. 2021 seamount collision On 2 October 2021, Connecticut was damaged after she collided with a seamount while maneuvering in the South China Sea. About eleven sailors sustained injuries, though none were reported to be life threatening. The submarine's propulsion system were said to be operating normally. After an investigation, the commanding officer, his executive officer, and the chief of the boat were all relieved of duty. The US Navy intends to repair the submarine, with work to begin in 2023. See also Major submarine incidents since 2000 2005 USS San Francisco (SSN-711) seamount collision 2008 HMS Superb (S109) underwater pinnacle collision References Based on the Naval Vessel Register, various press releases and former shipmates. External links Ships built in Groton, Connecticut Seawolf-class submarines Nuclear submarines of the United States Navy 1997 ships Submarines of the United States Military in Connecticut United States submarine accidents