This was an AIP submarine with a hull diameter of 7.3 metres (23 ft 11 in) compared to 6.2 metres (20 ft 4 in) for the Scorpène family, a submerged displacement of around 2,990 tonnes versus 1,740 tonnes, larger rudder surfaces and a different fin position.

The new requirement called for a larger submarine with better endurance and land-attack missiles, which became known as the S-80A design. This shift was codified in guidance of January 2002 from the Chief of Naval Operations and in the strategic defence review of February 2003. This was soon overtaken by events, as the Armada (navy) became more interested in using submarines for power projection than in a more static, defensive role. A staff requirement for the S-80 Scorpène variant was completed in October 2001. The same year Spain started to look again at its requirements, and in 1998 they indicated that they would buy four Scorpènes, optionally with an air-independent propulsion (AIP) system for greater endurance when submerged. The end of the Cold War meant that funding dried up and the joint venture had to wait until 1997 for their first sale - to Chile - of the new design, which was designated the Scorpène class in export markets. This joint design was shown at Euronaval in October 1990. The firm Bazán (later Izar, and then subsequently, the Spanish state-owned Navantia ) started on a new design but when it started to look like the S-80, it was agreed to collaborate in a joint venture based on the French S-80. Meanwhile, Spain faced the same problem in replacing their Daphnés, known as the Delfín class in Spanish service, as part of Plan ALTAMAR.

DCNI then proposed a cheaper option called the S-90B, an S-70 Agosta-class submarine with limited improvements which was again rejected by the French but which was exported to Pakistan. The French shipyard DCNI ( Direction des Constructions Navales International) came up with an all-new design called S-80, with a teardrop hull and new weapons and sensors, which the French government ultimately decided not to fund. In the 1980s France began studies for the replacement of their S-60 Daphné-class diesel submarines. Galerna (S-71) and Tramontana (S-74) are still active. History Submarine Mistral (S-73) of the Agosta-class submarine (S-70). The S-80 class has also been offered for export. The remaining three boats are slated to be delivered in 2024, 20. The lead boat in the class, the Isaac Peral, the first unit in the series, was launched by King Felipe VI and his daughter, Princess Leonor, heir to the throne, on 22 April 2021 at the Cartagena shipyards, entered to service in 2023, after originally being targeted for 2011. The characteristics of this class of ships place them at a level close to those of nuclear propulsion. They will have an integrated platform control system that allows operation with a reduced crew complement and a high degree of automation with remote control. They are oceanic submarines of medium tonnage with the capacity to carry out long duration missions in scenarios far from their base, and to do so stealthily. On November 30, 2023, the first submarine of the class entered service with the Spanish Navy The submarines are as of 2023 slated to begin entering service in the same year. Due to problems with the design, it had to be extensively redesigned in the 2010s, and a Spanish government budget crisis forced additional delays. The class has its roots in the late 1990s, and Spain ordered the submarines into production in 2003. In common with other contemporary submarines, they feature air-independent propulsion. The S-80 Plus class (or Isaac Peral class) is a Spanish class of four submarines being built by the state-owned Spanish company Navantia at its Cartagena shipyard for the Spanish Navy. m Ħ × 533 mm (21.0 in) torpedo tubes with DM2A4 torpedoes and Harpoon missiles UGM-84 Sub-Harpoon block II.1 electric motor (3,500 kW), 1 AIP fuel cell unit (300 kW).Submarine with air-independent propulsion (AIP)

Who made first submarine