After service in the Atlantic Fleet out of Submarine Base New London, Connecticut, for half a year, Marlin departed New London 21 March 1942 for Casco Bay, Maine. She arrived the next day for duty with TG 27.1, training new escort vessels in antisubmarine warfare. She returned to New London 18 April, and operated in Long Island Sound through 1942.
On 7 January 1943 the submarine arrived in Casco Bay for further duty with TG 27.1 until 16 January. She then spent the next 2½ years patrolling and training ships off New London and Portsmouth, New Hampshire.
On 26 July 1945, while making a submerged practice approach on Chaffee (DE-230), she collided with SC-642 with slight damage to both ships. In September Marlin kept company with Chetco (AT-99) on one of her trips from Portsmouth, reaching New London 10 September.
On 20 October 1945 Marlin departed New London with Skipjack (SS-184) for Bridgeport, Connecticut, arriving that day. Five days later she continued on to Boston, Mass, arriving 31 October. She was decommissioned at the Boston Navy Yard on 9 November 1945. Marlin was sold 29 March 1946 to the Boston Metals Company of Baltimore, Maryland, for scrapping.
Marlin is the submarine prominently featured as the fictional Corsair in the 1943 movie Crash Dive, filmed at Submarine Base New London. Her sail at the time of the movie resembled Mackerel's; the forward portion was later cut back for a 20 mm Oerlikon gun platform.
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^ abcdefghijklmU.S. Submarines Through 1945 pp. 305-311
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