French nuclear submarine Tourville returns to Cherbourg for unexpected technical modifications.

According to information published by Actu.fr on September 17, 2024, the French nuclear attack submarine Tourville has unexpectedly returned to Cherbourg for technical adjustments, just days after departing for trials in the Atlantic.
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French Barracuda-class submarine Duguay-Trouin. (Picture source: French MoD)

The vessel, built by Naval Group, had left Cherbourg following two rounds of summer trials, initially in July and again in early September. This latest testing phase, which had been kept confidential, was meant to validate operational capabilities in deeper waters, beyond what the English Channel offers.

Initially, the Tourville was not expected to return to Cherbourg and was slated to continue its journey towards Toulon, its future homeport, joining the ranks of its predecessors, the Suffren and Duguay-Trouin. However, like the Suffren—which had to return for similar adjustments in 2020—the Tourville encountered technical issues requiring it to head back to Cherbourg on September 17, 2024, for further work.

About the submarine

The Tourville (S637) is the third nuclear-powered attack submarine (SSN) of the Suffren-class, developed under France's Barracuda program. It is part of a fleet designed to replace the aging Rubis-class submarines. The submarine was launched by Naval Group in July 2023 and began sea trials in July 2024. These trials, known as "Alpha Trials," followed the commissioning of its nuclear reactor earlier in 2024.

The Tourville is equipped with advanced technology, including naval cruise missiles, F21 heavyweight torpedoes, and Exocet SM39 anti-ship missiles. It also has systems designed for special operations, including a divers' hatch and the potential for a dry deck shelter to deploy underwater vehicles and special forces.

In terms of size and capabilities, the Tourville displaces around 5,200 tonnes when submerged, has a length of 99 meters, and can dive to depths greater than 350 meters. It is powered by a nuclear reactor that provides substantial endurance and operational autonomy, allowing it to remain at sea for extended periods without the need for refueling.