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.

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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.