Cold War era underground government facility | The Government's Secret Underground Nuclear Bunker

One of the first publicly revealed underground facilities was the
Cheyenne Mountain Operations Center. Construction began in May,
1961, and was completed December, 1965. The main tunnel is a third of
a mile long and leads to a pair of 25-ton blast doors which are 50 feet
apart. Beyond the second door is an underground complex consisting
of a 4-1/2 acre area of chambers and tunnels nearly a mile long. The
main chamber consists of three areas 45 feet wide, 60 feet high, and
588 feet long, which are intersected by four chambers 32 feet wide, 56
feet high, and 335 feet long. Within the inner complex, there are fifteen
free-standing buildings– a one story, a two story, and 11 three-story
buildings.
Although the primary source of electricity is the city of Colorado
Springs (a back-up power source comes from six 1,750 kilowatt, 2,800
horse-powered diesel generators), it is essentially a self-contained
complex in that all the support services necessary to maintain the
operation is contained within, such as a dining facility, medical and
dental facility, pharmacy, two physical fitness centers, a base
exchange, chapel, and a barbershop. Water is stored in four excavated
reservoirs (three are for industrial purposes, and the other is the
complex’s primary domestic water source) which have the potential to store 1.5 million gallons of water.
This underground complex contains facilities for Air Warning
(providing aerospace warning and control for North America), Missile
Warning Center (for attacks against the United States or U.S. forces
overseas), and Space Control Center (to detect, track, identify and
catalog all man-made objects orbiting the earth).

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