the Argentine Navy as ARA Santiago del Estero (S-12). Along with ARA Santa Fe (former ), she was used mainly for training. The conning towers of both submarines were later locally upgraded to improve hydrodynamics. Some years ago, Argentinian officials disclosed that a group of tactical divers had carried out an incursion on the Falkland Islands on board the Santiago del Estero in October 1966. The submarine was returned to US Navy custody, 1 September 1971, to be struck from the Naval Vessel Register and sold outright to the Argentine Navy, which therefore employed them only for training purposes. Both submarines were broken up in 1974 for use as spare parts. See also ARA Santiago del Estero for other Argentine ships named after Santiago del Estero Province References External links Balao-class submarines Ships built in Manitowoc, Wisconsin 1944 ships World War II submarines of the United States Ships transferred from the United States Navy to the Argentine Navy