The M1 MSBS was the first French

submarine-launched ballistic missile A submarine-launched ballistic missile (SLBM) is a ballistic missile capable of being launched from submarines. Modern variants usually deliver multiple independently targetable reentry vehicles (MIRVs), each of which carries a nuclear warhead ...

Overview

In French, MSBS is the abbreviation for ''Mer-Sol Balistique Stratégique'', or Sea-Ground Strategic Ballistic Missile. It has two stages. It was deployed on the ''Redoutable''-class SNLEs (''Sous-marin Nucléaire Lanceur d'Engins'') (Device-launching Nuclear Submarine) or SSBNs from 1971 to 1975. It was replaced by the M2 MSBS in 1974–75.MSBS M1 at Astronautix.com
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References

Submarine-launched ballistic missiles of France Nuclear weapons of France Military equipment introduced in the 1970s {{France-hist-stub