
The complex was built under 2,000 feet (610 m) of granite on 2 hectares (5 acres). Fifteen three-story buildings are protected from movement, e.g. earthquake or explosion, by a system of giant springs that the buildings sit on and flexible pipe connectors to limit the operational effect of movement. A total of more than 1,000 springs are designed to prevent any of the 15 buildings from shifting more than 1 inch (25 mm). The complex is the only high-altitude Department of Defense facility certified to be able to sustain an electromagnetic pulse (EMP). There is a large quantity of cots for most of the personnel, including suites for high-ranking officers within the bunker. Amenities include a medical facility, store, cafeteria, and fitness centers inside and outside the mountain.
Source: https://en.wikipedia.org/wiki/Cheyenne_Mountain_Complex

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