Suffren-class

France's modern nuclear attack submarine — a pump-jet propelled SSN that restores deep-strike capability with the MdCN cruise missile and introduces a special-forces lock-out chamber, replacing the Rubis class one-for-one.

Overview

The Suffren class (Barracuda program) is the French Navy’s first all-new nuclear attack submarine design since the Rubis boats entered service in the 1980s. Six boats are planned to reinvigorate the French SSN force with a modern, quiet platform that combines anti-submarine and anti-surface warfare, land-attack cruise missiles (the MdCN, a naval cruise missile with a range of over 1,000 km) and a dedicated lock-out chamber for special operations forces. The lead boat, Suffren, was admitted to active service in June 2022, and three boats are operational as of mid-2026.

Development

The Barracuda program was launched to replace the six aging Rubis-class SSNs with a larger, more capable boat designed for long-duration patrols and multi-mission flexibility. The first-of-class, FS Suffren, was rolled out of Naval Group’s Cherbourg shipyard and launched on 12 July 2019, entering active service three years later. The second hull, Duguay-Trouin, followed in 2024, and the third, Tourville, in 2025. Construction is well advanced on the fourth boat, De Grasse: its K15 nuclear reactor was started for the first time in December 2025, and the submarine began alpha sea trials in February 2026. The full six-boat programme is scheduled for completion within the decade, restoring the French SSN fleet to its intended strength.

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