The USS S-16 (SS-121) was built in Bridgeport, Connecticut, by the Lake Torpedo Boat Company. Launched on 23 December 1919, the S-boat was commissioned into the US Navy on 17 December 1920. At the time, the 231-foot long submarine was the largest vessel of her type in the Navy. The boat was de signed to safely operate at depths up to 200 feet. After serving the Navy throughout the Pacific, the S-16 was decommissioned on 22 May 1935, but brought back into service on 2 December 1940 due to World War II hostilities. The USS S-16 saw no war action, instead patrolled throughout the Caribbean monitoring merchant shipping. Decommissioned for the final time on 4 October 1944, the antiquated vessel was eventually sunk as a target 18 miles off Key West on 3 April 1945. The S-16 now rests in almost 260 feet of water, listing to starboard.