(SS-406: dp. 1,526 (surf.), 2,401 (subm.); l. 311'8"; b. 27'3"; dr. 15'3"; s. 20 k. (surf.), 9 k. (subm.); cpl. 81; a. 1 5", 1 40mm., 1 20mm., 10 21" tt.; cl. Balao)
A slender, mailed fish of the North Atlantic.
Sea Poacher (SS-406) was laid down by the Portsmouth (N.H.) Navy Yard on 23 February 1944; launched on 20 May 1944; sponsored by Mrs. J. H. Spiller, wife of Comdr. Spiller, hull superintendent at the Navy Yard; and commissioned on 31 July 1944, Comdr. F. M. Gambacorta in command.
Following underway trials, training, and shakedown in the Portsmouth, N.H., and New London, Conn., areas, Sea Poacher transited the Panama Canal and arrived at Pearl Harbor on 25 October 1944. Although her first two war patrols were unproductive, during the third, conducted in the Kuril Islands area, Sea Poacher torpedoed and sank a Japanese trawler and, four days later, sent two fishing boats to the bottom in a surface attack. During the latter action, three crewmen were injured when the 20 millimeter gun exploded. Due to the seriousness of their injuries, the patrol was terminated ahead of schedule, and the submarine returned to Midway.
After conducting her fourth war patrol off the eastern coast of Honshu and Hokkaido, Sea Poacher was undergoing refitting at Pearl Harbor when the war ended on 15 August 1945.
From 1946 to 1949, Sea Poacher was based at Balboa, Canal Zone, as a unit of Submarine Squadron (SubRon) 6 engaging in fleet exercises and antisubmarine training, and, on 1 June 1949, was transferred to Key West, Fla., as a unit of SubRon 4. In 1951, the submarine became the first Guppy IA conversion performed at the Charleston Naval Shipyard.
For the remainder of her 25-year career, Sea Poacher operated for the most part in the Key West, Fla., and Caribbean areas, providing services to various units of the Atlantic Fleet with time out for tours of duty with the 6th Fleet in the Mediterranean and various exercises with NATO forces. On 10 July 1952, while operating in the Key West area, the submarine had the unique experience of rescuing a blimp which had suffered an engine casualty and was floating helplessly in the water. The submarine promptly came to the aid of the stricken airship and proceeded to tow it the 40 miles back to its base at the United States Naval Air Station, Boca Chica, Fla.
In July 1959, Sea Poacher was transferred to SubRon 12, also based at Key West, and continued to serve as a unit of this squadron for the remainder of her active service. In the fall of 1962, Sea Poacher was deployed with other Atlantic Fleet units maintaining the quarantine imposed on Cuba during the missile crisis.
In 1969, Sea Poacher concluded her service with a three and one-half month deployment to the eastern and northern Atlantic areas to participate in antisubmarine training exercises with units of the Spanish and Portugese navies. Upon returning to Key West, the submarine operated locally and in the Caribbean until 20 October when she set sail for Philadelphia and inactivation. Sea Poacher was reclassified an auxiliary submarine (AGSS) on 1 November, decommissioned on 15 November 1969, and was assigned to the Atlantic Reserve Fleet at Philadelphia. On 30 June 1971, she reassumed the designation of a fleet submarine (SS). On 15 August 1973, her name was struck from the Navy list, and the submarine was sold to Peru in July 1974.
Sea Poacher received four battle stars for World War II service.