File Description: FS2004 Scenery - Naval Submarine Base New London Groton CT. On the east bank of the Thames River near Groton, CT, New London Naval Submarine Base was the birthplace of the submarine force. It was originally a Navy yard, converted to a submarine base in 1916, and greatly expanded in World War II. The advent of nuclear power required an improvement in training and support facilities. By 1959, New London had become the largest submarine base in the world with 8,210 active personnel. The base was recommended for closure by the DoD in the 2005 BRAC Recommendations. Created using Instant Scenery by John B. Loney, Jr.