Inside America’s Fortress Protected by Massive Steel Doors – Cheyenne Mountain

Join us as we take you inside the Cheyenne Mountain Complex, one of America’s most secure and secretive military fortresses. Discover the impressive features that make this facility a marvel of modern engineering, including its massive 25-ton blast doors, and the immense springs designed to shield it from nuclear explosions and earthquakes. Click here to Subscribe USA Military Channel: Film Credits: U.S. Air Force and Space Force The appearance of U.S. Department of Defense (DoD) visual information does not imply or constitute DoD endorsement.