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(SS-31: dp. 3~ n., 1. 161'; b. 18'1" - dr. 1210t'; s. 14 k.

G-3 was laid down as Turbot 30 March 1911 by the Lake Torpedo Boat Co., Bridgeport, Conn.; renamed on 11 November 1911; launched 27 December 1913 at New York Navy Yard, and commissioned 22 March 1916, Lt. 1~. X. Gygax in command.

She spent the greater part of her entire career out of the submarine base at New London, Conn. She was constantly employed in the training of student officers in Block Island Sound and in Great Salt Pond Bay. In addition she carried out pioneering work that included: experimental submarine net operations off Port Jefferson, N.Y., use of the submarine rescue diving bell; experiments with reflector recognition lights; submerged sound and magnetic detection tests with patrol boats and submarine chasers; and u~e as target in approach anti attack problems that involved the testing of depth charges.

When German U-boats appeared off the eastern seaboard in the last year of World War I,G-3 conducted periscope and listening patrols in the submarine defense areas of New London.

After World War I, she continued her schoolship and experimental work in the New London area. She decommissioned 5 May 1921; was towed to the Philadelphia Navy Yard from New London 17 August; and was sold for scrapping 19 April 1922 to J. G. Hitner, Philadelphia, Pa.