Several unidentified drones overflew France’s nuclear submarine base on Thursday evening.
Several drones flew over the Île Longue submarine base (Finistère), home to France’s nuclear-powered ballistic missile submarines (SSBNs), on Thursday evening, December 4, the gendarmerie told AFP. Five drones were technically detected around 7:30 p.m. Thursday over the base, which borders the Brest harbor.
The unauthorized drone overflight of one of France’s “most secretive and heavily defended places” represents a serious security breach at the home port of the Force Océanique Stratégique (FOST), which forms the backbone of French nuclear strategy with submarines capable of launching nuclear-armed ballistic missiles.
The marine rifle battalion, which is responsible for protecting the base, fired several shots to neutralize the drones, according to a source.
France’s Nuclear Arsenal Headquarters
Île Longue, located in Brest Harbor in the Finistère department of Brittany, serves as the base for France’s four Triomphant-class nuclear-powered ballistic missile submarines (SSBNs): Le Triomphant (S616), Le Téméraire (S617), Le Vigilant (S618), and Le Terrible (S619).
The base houses approximately 290 nuclear warheads for deployment on submarine-launched ballistic missiles, with France typically maintaining at least one submarine on continuous patrol at sea carrying 16 M51-type SLBMs—each missile capable of delivering multiple nuclear warheads with a range of 4,000 kilometers.
Pattern of European Drone Incidents
The Île Longue overflight continues a troubling pattern documented across Europe:
- Scandinavia: Multiple airports in Denmark, Norway, and Sweden experienced repeated drone incidents forcing closures
- Germany: Munich Airport shut down twice due to drone sightings
- Poland and Baltic States: Unauthorized UAV operations near sensitive military installations
- France (September 2025): Drones sparked security alerts at the Mourmelon-le-Grand military base hosting Ukrainian soldiers training
French law strictly prohibits civilian drones from flying over military installations, with unauthorized flights over sensitive sites punishable by heavy fines or imprisonment. The systematic nature of European incidents suggests coordinated operations rather than isolated hobbyist violations.
