OVERVIEW: The S 615 L *Inflexible* [Le Redoutable Class] is a ballistic missile submarine (SSBN) operated by the French Navy. Entering service in 1990, it represents a later iteration of the *Le Redoutable* class, incorporating improvements over its predecessors.

DETAILS:
The *Inflexible* represents the culmination of France's independent nuclear deterrent program, a cornerstone of its strategic defense policy. The *Le Redoutable* class, in general, was conceived in the 1960s and 70s as a direct response to the Cold War environment and the need for a survivable second-strike capability. *Inflexible*, however, incorporated modifications during its construction and service life to accommodate newer technologies and evolving strategic requirements, differentiating it somewhat from the original *Le Redoutable* vessels. This included enhanced acoustic silencing measures and potentially improvements to its fire control systems. The design philosophy behind the *Le Redoutable* class, including *Inflexible*, prioritized stealth, survivability, and reliability, allowing it to operate undetected for extended periods while maintaining a credible deterrent force.

The primary role of the *Inflexible* is strategic deterrence, achieved through its capability to launch nuclear-tipped ballistic missiles. While primarily an SSBN, *Inflexible* retains a secondary anti-submarine warfare (ASW) capability, as indicated by its suite of sonar systems. This provides a self-defense capacity against potential threats while on patrol. However, the vessel's primary mission dictates operational doctrine that prioritizes stealth and avoidance of contact, minimizing the use of active sonar except in critical situations. The *Inflexible* is not designed for anti-surface warfare (ASuW) or anti-air warfare (AAW) roles in any significant capacity.

The *Inflexible*'s effectiveness stems from the integrated sensor suite. The DUUX 5 Fenelon [TSM 2255] is a sophisticated passive ranging and intercept sonar system, providing long-range detection and classification of potential threats. The DUUV 23 system likely serves as a flank array sonar, complementing the bow-mounted DUUX 5. The DSUV 61A is a towed array sonar, providing extended range detection capabilities, particularly in noisy environments. The DRUA 33C Calypso III [TRS 3100] radar provides surface search and navigation capabilities. The ARUR 13 [DR 3000U] likely fulfills electronic support measures (ESM) duties, detecting and analyzing radar emissions from other vessels and aircraft. The DUUG 6 [M5] fire control system integrates sonar data to provide targeting solutions for its torpedoes. The generic submarine periscopes, both optical and LLTV (Low Light Television), provide visual situational awareness. The vessel is armed with M4/TN70 ballistic missiles, conferring a significant strategic strike capability, and 550mm torpedo tubes for self-defense.

SPECIFICATION: Length: 128.0 m || Beam: 10.6 m || Draft: 10.0 m || Disp: 6500 t

SENSORS: DUUX 5 Fenelon [TSM 2255] || DUUV 23 || DSUV 61A || DRUA 33C Calypso III [TRS 3100] || ARUR 13 [DR 3000U] || DUUG 6 [M5] || Generic Submarine Periscope, Optical || Generic Submarine Periscope, LLTV

ARMAMENT: M4/TN70 || 550mm TT || Signal Ejector