ARA Santa Fe was an Argentine Balao-class submarine that was lost during the Falklands War. Built by the US during the Second World War, the ship operated in the United States Navy as USS Catfish (SS-339) until 1971 when she was transferred to the Argentine Navy. She served until 1982 when she was captured by the British at South Georgia after being seriously damaged and subsequently sank along a pier, with just her conning tower (sail) visible above the waterline. The submarine was raised, towed out of the bay and scuttled in deep water in 1985.

The Balao class was a design of United States Navy submarine used during World War II, and with 120 boats completed, the largest class of submarines in the United States Navy. An improvement on the earlier Gato class, the boats had slight internal differences. The most significant improvement was the use of thicker, higher yield strength steel in the pressure hull skins and frames, which increased their test depth to 400 feet (120 m). Tang actually achieved a depth of 612 ft (187 m) during a test dive, and exceeded that test depth when taking on water in the forward torpedo room while evading a destroyer.