Albacora-class submarine

The Albacora class was a diesel-electric attack submarine developed for the Portuguese Navy based on the French Daphné class.

In 1964, the Portuguese government ordered the construction of four of this class at the Dubigeòn-Normándie Shipyard to create the 4th Submarine Flotilla.

With the first submarine commissioned on 1 October 1967, the Portuguese Navy started to have a submarine able to operate in both coastal and oceanic zones, especially in the Portuguese exclusive economic zone.