(SS72: dp. 491 (surf.), 566 (subm.); l 175; b. 167; dr. 1311; s. 14 k. (surf.), 11 k. (subm.); cpl. 29; a. 1 3, 4 18 tt.; cl. O11).
O11 (SS72) was laid down 6 March 1916 by the Lake Torpedo Boat Co., Bridgeport, Conn.; launched 29 October 1917; sponsored by Mrs. Bernard M. Baruch; and commissioned at New York 19 October 1918, Lt. Comdr. F. W. Scanland in command.
Commissioned too late for World War I service, O11 joined other boats of her class at Cape May, N.J. in 1919. On 20 September 1919, she was placed in commission, in reserve at Cape May and steamed to Philadelphia in October; workmen at Philadelphia spent months working on the boat before she departed for Coco Solo.
The arrival of a sub squadron at Coco Solo in 1913 had demonstrated the usefulness of the boats; the base continued as a distant submarine overhaul and testing area into the 1920s. O11 reported there in 1922; after deck crews had brought her up to prime efficiency, she took several test dives off Panama in spring 1923. In October, she sailed to Philadelphia.
O11 decommissioned at Philadelphia 21 June 1924 and was turned over to the Commandant, Navy Yard, Philadelphia. Struck from the Navy Register 9 May 1930, the boat was sold in July 1930.