Blast doors The 25-ton North blast door is the main entrance to another blast door (background) beyond which the side tunnel branches into access tunnels to the main chambers. Amenities include a medical facility, store, cafeteria, and fitness centers inside and outside the mountain. There are a large quantity of cots for most of the personnel, including suites for high-ranking officers within the bunker. The complex is the only underground Department of Defense facility certified to be able to sustain a high-altitude electromagnetic pulse (EMP). A total of more than 1,000 springs are designed to prevent any of the 15 buildings from shifting more than one inch. 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. The complex was built under 2,000 feet of granite on five acres.
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