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Mountain complex in colorado springs opened 25 ton doors. it took years and a million and a half pounds of dynamite to blast through thousands of feet of solid granite. cheyenne mountain is the most fortified military installation in north america. conceived and constructed during the cold war when a soviet nuclear attack was a chillingly real possibility. as americans learned to prepare for the worst-case scenario of all-out nuclear war. >> first, you duck, and then you cover. reporter: the army corps of engineers was busy hollowing out a cavern deep inside cheyenne mountain, erecting inside ...

Installation, the cheyenne mountain complex in colorado springs opened its 25 ton doors. it took years and a million and a half pounds of dynamite to blast through thousands of feet of solid granite and build this complex. today cheyenne mountain is still the most fortified military instation in north america, conceived and constructed during the cold war when a soviet nuclear attack was a chillingly real possibility. as americans learned to prepare for the worst-case scenario of all out nuclear war -- >> first, you duck, and then you cover. >> the army corps of engineers was busy hollowing ou...

Each rests on massive springs, shock absorbers shoe the building, people and equipment can rise out any seismic event, including shock weighs from a nuclear detonation. >> this was born out of the fears of the cold war and nuclear attack, right? >> it was. early design, concepts were developed in the late 50s with construction starting in 61. >> the idea is that you have a for tres in here inpenetratable from the outside. no electromagnetic pulse, nuclear attack. >> correct. designed to survive and endure all of those types of threats. >> the hundreds of people that work here commute through a...

Hits of the year. >> it's spencer tracy as you have never seen him before. >> the nation mourned the death of a major star from hollywood's golden age, spencer tracy. and the cheyenne mountain complex in colorado springs opening its 25-ton doors. took years and 1.5 million pounds of dynamite to blast through thousands of feet of solid granite. cheyenne mountain is the most fortified military installation in america. conceived when a soviet nuclear attack was a chilling possibility. as americans learn to prepare for the worst case scenario of all-out nuclear war -- >> first you duck and then yo...