Caiman was decommissioned, struck from the Naval Register, and transferred (sold), 30 June 1972, under terms of the Security Assistance Program, to Turkey. She arrived on 23 August 1972 in Gölcük and was commissioned the following day as TCG Dumlupınar (S 339), the third submarine of that name.
Unfortunately, she too collided in the Dardanelles (Just 28 nmi (52 km). north from the point where the previous TCG Dumlupınar was lost) with the Soviet freighter Szik Vovilov. Luckily, her crew was able to ground the submarine on a nearby bank, thus preventing another tragedy.
