History
Ordered	24 June 1970
Builder	Howaldtswerke Deutsche Werft AG
Laid down	15 March 1971
Launched	11 October 1973
Commissioned	29 August 1974
Homeport	Callao
Motto	Honor y coraje
General characteristics
Displacement	1,180 t surfaced 1,285 t submerged
Length	55.9 m
Beam	6.4 m
Draft	5.9 m
Propulsion	4 MTU Type 12V493 AZ80 GA31L diesel engines 1 Siemens electric motor 1 shaft 4,600 hp (3,400 kW)
Speed	11 knots surfaced 21 knots (39 km/h) submerged
Range	11,300 nm surfaced at 4 knots (7.4 km/h)
Endurance	40 days on patrol
Complement	7 officers, 29 enlisted
Armament	8 × 21 in (533 mm) torpedo tubes 14 SST-4 torpedoes

BAP Islay (SS-35) is one of two Type 209/1100 submarines ordered by the Peruvian Navy on 24 June 1970. She was built by the German shipbuilder Howaldtswerke Deutsche Werft AG at its shipyard in Kiel. She is named after the Battle of Islay which took place between naval forces of Peru and Chile on 12 January 1838. Following sea trials in the North Sea, she arrived to its homeport of Callao in 1974. After almost a decade in service she was overhauled in Kiel in 1983 for further use.

Sources

• Baker III, Arthur D., The Naval Institute Guide to Combat Fleets of the World 2002-2003. Naval Institute Press, 2002.
• Ortiz Sotelo, Jorge, Apuntes para la historia de los submarinos peruanos. Biblioteca Nacional, 2001.