I 309

I 309 is a military bunker located near Île Longue, France, a strategic peninsula in Brittany that serves as the home base for France's nuclear submarine fleet. The site is part of the larger nuclear deterrence infrastructure of the French Navy, which operates from the nearby Brest naval base. Île Longue has been a critical component of France's nuclear defense strategy since the Cold War era, housing facilities for submarine operations and command and control systems. The bunker system is integrated with the broader French nuclear deterrent, which includes ballistic missile submarines and strategic command structures.