The third USS Porpoise (SS-7) was an early Plunger-class submarine in the service of the United States Navy, later renamed as A-6. She was laid down on 13 December 1900 in Elizabeth, New Jersey at the Crescent Shipyard under the direction of shipyard superintendent, Arthur Leopold Busch. This craft was launched on 23 September 1901, and commissioned at the Holland Torpedo Boatyard at New Suffolk, New York on 19 September 1903, with Lieutenant Charles P. Nelson in command.