Silence and secrecy. These are the watchwords that reign aboard France's four ballistic missile submarines, called SSBNs. With a crew of 110 on missions lasting on average two and a half months, hidden somewhere in the depths of the ocean, any one of these airtight vessels of mass destruction can launch a nuclear strike against an enemy within seconds, at the order of the French president. Trace the history of the exceptional machines and discover how they are operated and maintained, with 3D animations, interviews with engineers, captains, and sailors.

Silence and secrecy. These are the watchwords that reign aboard France's four ballistic missile submarines, called SSBNs. With a crew of 110 on missions lasting on average two and a half months, hidden somewhere in the depths of the ocean, any one of these airtight vessels of mass destruction can launch a nuclear strike against an enemy within seconds, at the order of the French president. Trace the history of the exceptional machines and discover how they are operated and maintained, with 3D animations, interviews with engineers, captains, and sailors.