[3] It is part of the Museo del Mar y de la Sal (Museum of the Sea and Salt).

[10] It is designed for to patrols against surface or submarine forces, attack on maritime traffic, ship recognition, naval mine distribution and special operations.

[citation needed] The Delfin-class submarine defense program (also called the S-60 series) was approved by the National Defense Board on November 17, 1964 by Minister of the Navy Pedro Nieto Antúnez comprised the first two submarines, later expanded to two plus[11] and financed by law 85/65 of November 17.

[13][1] Throughout its operational life, the Delfín participated in several international maneuvers together with ships from other countries, for example in June 1996 it participated in the Tapón ’96 maneuvers together with the Spanish ships Príncipe de Asturias, Santa María, Numancia and Baleares, the Americans USS Grayling and USS Conolly and the Greek destroyer Formion.

[15] In this naval parade, the Dédalo, Príncipe de Asturias, the Baleares-class frigates: Andalucía, Extremadura and Victoria, the Descubierta-class corvettes, Diana, Vencedora and Infanta Cristina, the submarines Delfín and Marsopa participated, among other smaller units; as well as representatives of other countries, among others, the French Foch, the Italian Giuseppe Garibaldi, the American missile cruiser USS Belknap and the Portuguese frigate Comandante Hermenegildo Capelo.

[19] Since then, she has been moored in the port of that town and is part of the Museo del Mar y de la Sal (Museum of the Sea and Salt).

[20][21] In 2015, the submarine participated in an international amateur radio transmission for 48 hours in an initiative that tried to put all the existing floating museums in the world in contact.