Cheyenne Mountain Complex
The Cheyenne Mountain Complex is a deep underground military installation located near Colorado Springs, Colorado, built into and beneath Cheyenne Mountain at a depth of approximately 2,000 feet. Constructed during the Cold War under the direction of the US Army Corps of Engineers, it is the primary acknowledged example of a Deep Underground Military Base (DUMB) in the United States and serves as the home of the North American Aerospace Defense Command (NORAD) air defense operations center.
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Physical Description
The complex spans 5.1 acres and features six three-story-high, 40-foot-wide tunnels housing 15 three-story buildings constructed of steel plates — all on spring mounts to absorb the shock of a nearby nuclear detonation. The facility is designed to be self-sustaining and blast-hardened to survive near-miss nuclear strikes.
Construction Context
The Cheyenne Mountain facility was built in the 1960s. In a 1989 speech, Army Corps of Engineers Deputy Director Lloyd A. Dua referenced the Corps' involvement in Cheyenne's construction while acknowledging the existence of "other projects of similar scope which I cannot identify" — confirming that multiple similarly large classified underground installations exist but remain secret. This statement is cited as evidence that the Cheyenne Mountain facility is not the full extent of US deep underground military construction.
The facility is used by UAP Gerb as the baseline acknowledged DUMB to establish technical feasibility and financial precedent for the far larger alleged network of covert DUMBs focused on UAP legacy programs.