At the risk of beating a dead horse, I thought of something I forgot to mention about Cheyenne Mountain Complex which I wanted to share. That led me to do some further research online:
Inside the mountain (one mile in and 2,000 feet below the peak) is a 5 1/2 acre campus consisting of 15 buildings. Most are 3 stories tall. These modular buildings sit on huge springs. The mountain is solid granite and will shield the bunker not only from a nuclear blast but also the resulting EMF (Electro Magnetic Field) which would normally disrupt electricity and computer operations. There are tunnels leading in to the bunker and two 23-ton blast doors can be closed very quickly when an alarm is sounded (they are actually recessed in side tunnels so they would not face a direct blast). The doors were last closed (other than for practice) on September 11, 2001. Facility tours have not been conducted since that date.
In addition to the buildings, there are 3 giant lakes inside the mountain. One, a 1.5 million gallon spring-fed fresh water lake, provides drinking water for the workers. Another 4.5 million gallon lake (of water) is used as a heatsink to absorb and dissipate the heat created by generators, computer equipment, vehicles, etc. A third lake (of undisclosed size) contains diesel fuel for the vehicles and generators used inside the complex.