The S-615 L’Inflexible submarine was the last built within the Le Redoubtable SSBN class, which were France’s first nuclear powered ballistic missile submarines. However, this submarine was designed to carry the new M-4 submarine launched ballistic missiles (SLBM), larger and superior in range and performance to the M-2 and M-20 SLBM missiles in service. Because of this and because it incorporated the most modern electronics, L’Inflexible boat was considered a class on its own.

L’INFLEXIBLE gallery and more info


Información adicional

Ficha Completa
Country of origin



DCN, Cherbourg


Ballistic missile nuclear powered submarine

Entered service




Displacement, (full load)

Surfaced: 8,080 tonnes – Submerged: 8,920 tonnes

Dimensions (length x beam x draught)

128.70 x 10.60 x 10.00 meters

Power plant

2 x Pielstick 8PA4V185 diesel engines, 750 Kw (1,019 hp) each, (emergency use only)
1 x 100 MW pressurized water nuclear reactor, 2 geared steam turbines, 16,000 shp

Power, (total)

16,000 shp + 2,038 shp

Shafts - Screws

1 shaft – 1 screw


Surfaced: 20 knots (37 km/h) – Submerged: 25 knots (46 km/h)

Diving depth, (maximum)

300 meters


4 x 533mm torpedo tubes with 18 DTCN L5 or DTCN F17 torpedoes

SSM launcher

Exocet SM.39 mod.2 (launched from torpedo tubes) anti-ship missile

SLBM launcher

16 x M.4 / M.45 missiles