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| Redoutable-class submarine | |
|---|---|
| Name | Redoutable-class submarine |
| Country | France |
| Builder | Arsenal de Cherbourg |
| Laid down | 1924–1931 |
| Launched | 1927–1934 |
| Commissioned | 1931–1937 |
| Fate | varied; losses World War II and postwar retirements |
| Type | Ocean-going submarine |
| Displacement | 1,572–1,572 tonnes surfaced |
| Length | 92.3 m |
| Beam | 8.2 m |
| Draught | 4.9 m |
| Propulsion | Diesel-electric |
| Speed | 18.6 kn surfaced, 10 kn submerged |
| Range | 10,000 nmi at 10 kn |
| Complement | 65 |
Redoutable-class submarine was a group of 31 French ocean-going submarines built between the late 1920s and mid-1930s for long-range patrols and fleet screening. Designed during the Interwar period under the direction of the French Navy (Marine nationale), the class reflected lessons from World War I and influenced submarine doctrine ahead of World War II. Units of the class served with the Free French Forces and the Vichy regime, participating in Mediterranean, Atlantic, and colonial operations.
The class originated from requirements set after the Washington Naval Treaty and the Kellogg–Briand Pact debates that shaped interwar shipbuilding, with design work influenced by prototypes such as the earlier L'Inflexible and lessons from Admiral Raoul Pontier-era staff studies. Naval architects from the Direction des constructions navales collaborated with shipyards at Arsenal de Cherbourg, Ateliers et Chantiers de la Loire, and Chantiers de Penhoët to produce a large cruiser-submarine capable of transoceanic patrols similar in concept to contemporary United States Navy and Regia Marina designs. Political pressures from the French Parliament and budgetary oversight from the Ministry of Marine shaped displacement limits and armament lists, while sea trials at Brest, France and acoustic testing near Île-de-Bréhat refined hull lines and diving systems.
Ships of the class measured approximately 92.3 metres overall with a beam of 8.2 metres and a surfaced displacement around 1,572 tonnes, enabling extended range for operations between Metropole and overseas bases such as Dakar, Senegal and Nouméa, New Caledonia. Habitability improvements reflected insights from officers posted to French Indochina and crews who had served aboard World War I submarines; bunks, ventilation and storage were upgraded during refits at Toulon and Cherbourg. Crew complements typically numbered about 65 officers and ratings drawn from École Navale, reservists mobilized under the General Mobilization of 1939, and enlisted sailors from ports including Marseille and Brest.
Propulsion combined large diesel engines for surface running and electric motors for submerged operations, components procured from firms with links to Société des Forges et Chantiers de la Méditerranée and tested against standards set by the Bureau Veritas. Surface speeds reached about 18.6 knots, while submerged speed was around 10 knots; endurance allowed roughly 10,000 nautical miles at economical cruising speeds, enabling patrols to Azores and the South Atlantic hunting grounds. Diving trials conformed to procedures exercised during maneuvers with task groups centered on capital ships like the Dunkerque and coordinated with naval aviation assets such as flying boats from Aéropostale-era squadrons and later with coastal reconnaissance from Fairey Swordfish and Savoia-Marchetti types.
Offensive armament concentrated on six internal bow and stern torpedo tubes plus external trainable mounts in some refits, employing torpedoes produced by firms linked to the Compagnie générale des matières nucléaires supply networks of the era. Deck guns—typically 100 mm pieces—provided surface fire capability against merchantmen and auxiliary vessels encountered near lanes used by convoys from Gibraltar to Suez Canal. Anti-aircraft armament was augmented during wartime refits in response to threats from Regia Aeronautica and the Luftwaffe, using light automatic weapons supplied via depots in Algiers and Oran. Sonar and hydrophone suites were basic by later standards but incorporated improvements influenced by research at the Service hydrographique et océanographique de la Marine and acoustic work with the Centre d'études de la marine.
During World War II, Redoutable-class boats operated under complex political circumstances, serving with forces loyal to Vichy France at bases such as Mers-el-Kébir and later joining the Free French Naval Forces for operations in the Atlantic Ocean, the Mediterranean Sea, and colonial theaters. Several boats participated in patrols against Battle of the Atlantic convoy routes, escorted Allied shipping, and undertook reconnaissance in cooperation with units from the Royal Navy and the United States Navy. Losses occurred in engagements with German U-boats, Italian naval units including Regia Marina destroyers, and aircraft from the Luftwaffe, while others were scuttled at Toulon in 1942 or interned after actions around Mers-el-Kébir and the Battle of Dakar (1940). Postwar survivors served in training roles before decommissioning amid modernization programs overseen by the Ministry of Defence.
Throughout their service life, several hulls were modified for specialized roles: some converted to long-range minelayers operating in coordination with squadrons from Pointe-à-Pitre and Dakar, others adapted as transport submarines to supply isolated garrisons in French Indochina and Sahara outposts. A few underwent experimental trials with snorkel systems inspired by Dutch and German developments and cooperative trials with the Établissement industriel de l'armement for battery and electric motor upgrades. Postwar conversions included static training hulks at naval schools such as École de plongée and accommodation ships used at Toulon Naval Dockyard.
The class influenced subsequent French submarine design, informing concepts embodied in postwar types like the Narval-class submarine (1957) and shaping tactics adopted by the Force océanique stratégique planners. Several boats became museum exhibits or were memorialized in naval museums at Toulon and Rochefort, while wreck sites near Corsica and off North Africa draw interest from researchers affiliated with institutions such as the Centre national de la recherche scientifique and diving organizations including Comité Régional de Plongée. The Redoutable-class remains a subject of study in naval archives at the Service historique de la Défense and among naval historians publishing in journals like Revue historique des armées.