S-80 Plus class submarine Isaac Peral successfully sails at its maximum operational depth.

According to a press release published by Navantia on October 20, 2023, the S-80 Plus-class submarine Isaac Peral successfully navigated at its maximum operational depth.
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S-80 Plus class submarine Isaac Peral. (Picture source: Navantia)

This test was conducted with the collaboration of Navantia, the Navy, and the Ministry of Defence, indicating a significant step towards the submarine's final delivery post a series of further tests.

The venture of constructing four S-80 submarines, of which S-81 is a part, marks a technological leap for Navantia, the Navy, and the Spanish industrial sector. This programme has facilitated Navantia’s involvement in the new Technical Office (OTACV) aimed at introducing a new support methodology, as it becomes a Technical Design Authority.

Expressing acknowledgment for the efforts of all involved, Navantia's president, Ricardo Domínguez, noted that navigating at maximum operational depth is a symbolic achievement for the Ministry of Defence, the Navy, Navantia personnel, and the collaborating industry.

The successful navigation test of S-81 not only progresses Navantia's submarine construction programme but also reflects on Spain’s evolving defence capabilities and its industrial and technological base.

Technical data

The S80 Plus class submarine is characterized by a submerged displacement of 2,965 tons. It measures 81.05 meters in length, with a beam of 11.68 meters and a draught of 7.3 meters.

The propulsion system comprises a single shaft Etanol-AIP, three bio-ethanol engines, an electric motor, and an AIP fuel cell unit, interconnected through Vulkan couplings RATO-S G-561W.

The submarine has a surfaced speed of 12 knots and can reach up to 19 knots when submerged. It boasts a range of 8,000 kilometers, with an endurance of 30 to 55 days in immersion, indicating its long-duration operational ability. The test depth is marked at 460 meters.

The complement is set at 32 with an additional capacity for 8 troops. Armament includes six 533 mm torpedo tubes that are equipped with DM2A4 torpedoes and Harpoon missiles UGM-84 Sub-Harpoon block II.