Spain Unveils Indigenous 3,000-Ton Submarine Built for Silent Deterrence

Spain’s S-82 Narciso Monturiol, the second submarine of the S-80 Plus class, has begun sea trials to test its onboard systems under real-world conditions.

This includes assessments of propulsion and power generation systems, manoeuvrability, diving, surfacing performance, navigation, sonar, sensors, radar, weapons system, communications system and overall seaworthiness.

Built by Spanish naval builder Navantia at the Cartagena shipyard, the submarine is a part of the country’s S-80 Plus Submarine Program, which aims to replace the old Agosta-class submarines with a new class of subs.

The new submarine is 81 m long and displaces 3000 tons when submerged. It can accommodate 32 personnel and has additional capacity for special operations teams.

The S-80 Plus is armed with heavyweight torpedoes and anti-ship missiles, which can be launched through six 533 mm torpedo tubes, allowing it to engage both surface vessels and enemy submarines.

The submarine is designed for several missions like anti-submarine warfare (ASW), anti-surface warfare, surveillance and reconnaissance, interdiction, mine-laying operations, and the deployment of special operations forces.

Its combat management system, sonar suite, and low acoustic signature enable survivability in volatile and dangerous marine environments.

A striking feature of the country’s biggest defence project is the integration of an
indigenous Air-Independent Propulsion (AIP) system.

It extends underwater endurance by enabling submarines to remain submerged for much longer without needing to recharge the batteries frequently.

The ambitious project experienced years of delays after engineers found several technical issues with the design, which needed major modifications.

Despite this, the lead submarine of the class, S-81 Isaac Peral, was commissioned in 2023.