The Abtao class were four submarines of the Peruvian Navy

Peruvian Navy

The Peruvian Navy is the branch of the Peruvian Armed Forces tasked with surveillance, patrol and defense on lakes, rivers and the Pacific Ocean up to 200 nautical miles from the Peruvian littoral...

. Initially known as the Lobo class, they were modified U.S. Mackerel class, 825 tons standard, 1,400 tons submerged.

Ships

(1954) Pennant number 6, from 1959 SS-1, from 1960 SS-41. Completed in June 1954, initially known as Lobo, but renamed Dos de Mayo in April 1957. Discarded 1999. (1953) Pennant number 5, from 1959 SS-2, from 1960 SS-42. Completed in February 1954, initially known as Tiburon, but renamed Abtao in April 1957. Decommissioned in 1998 and became a museum ship in 2004. (1957) Pennant number 7, from 1959 SS-3, from 1960 SS-43. Completed in July 1957, initially known as Atun, but renamed Angamos in April 1957. Discarded 1990. (1957) Pennant number 8, from 1959 SS-4, from 1960 SS-44. Completed in October 1957, initially known as Merlin, but renamed Iquique in April 1957. Discarded 1993.