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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...