(SS-51: dp. 450 (surf.), 548 (subm.); l. 167'5"; b. 17’5"; dr. 13'7"; s. 14 k. (surf.), 10.5 k. (subm.); cpl. 28; a. 1 3", 4 18" tt.; cl. L-1)
L-11 was laid down 17 February 1915 by Fore River Shipbuilding Co., Quincy, Mass.; launched 16 May 1916; sponsored by Miss Mary Richards Latimer; and commissioned 15 August 1916, Lt. (jg.) W. R. Carter in command.
Assigned to the Atlantic Submarine Flotilla, L-11 operated along the East Coast developing new techniques of undersea warfare until April 1917. After America’s entry into World War I, submarines were needed to protect Allied shipping lanes to Europe, and L-11 departed Boston 4 December to undertake the task. Following a period of patrol and repair in the Azores, the submarine arrived Ireland in mid-February 1918 to join Submarine Division 5 in antisubmarine patrol off the British Isles.
For the next 9 months she ranged shipping lanes, sighting enemy U-boats on three occasions. On 11 May she made a torpedo attack on an enemy sub with inconclusive results.
After the Armistice, L-11 operated out of Portland, England, until 3 January 1919 when she sailed for the United States. Arriving Philadelphia 1 February, she operated off the East Coast for the next 4 years developing submarinewarfare tactics.L-11 decommissioned at Hampton Roads, Va., 28 November 1923, and was scrapped 28 November 1933.