GROTON, Conn. (Oct. 15, 2021) A Sailor stands watch aboard the Historic Ship Nautilus (SSN 571) as the ship prepares to be towed upriver for scheduled preservation maintenance onboard Naval Submarine Base New London in Groton, Conn., Oct. 15. Nautilus, the world’s first nuclear-powered submarine and current Submarine Force Museum centerpiece, will begin an estimated $36 million preservation project and is expected to be completed in six to eight months. (U.S. Navy photo by Chief Mass Communication Specialist Joshua Karsten)