France’s Ministry of the Armed Forces is investigating an incident involving five unidentified drones detected over Île Longue, the primary operational base for the country’s nuclear-armed ballistic-missile submarines. Security personnel at the heavily fortified western French naval facility activated counter-drone procedures and opened fire on December 4, 2025. The origin and purpose of the aircraft remain unknown, with no confirmed neutralizations reported. This incident reflects escalating drone activity around sensitive European military and nuclear installations.