Beneath the rocky surface of Cheyenne Mountain in Colorado , US , lurks a colonization prim for Armageddon . The Cheyenne Mountain Complex was build up at the height of the Cold War , and , when it pulls out all the layover , can withstandnuclear , electromagnetic , and biological attacks .

What is the Cheyenne Mountain Complex?

The dugout - on - steroids is one of America ’s most unattackable military installations , shielded beneath 760 meters ( 2,500 feet ) of granite . Having been blasted into the sight , the entrance archway is overshadow by Cheyenne , feeding a burrow whose curved design would airt any offending material right out the other death .

What kind of impact can the Cheyenne Mountain Complex survive?

Since the 23 - net ton bang door wo n’t be on the receiving last of any good time impact , the setup is estimate to keep the Cheyenne Mountain Complex secure even in the human face of a30 - megaton atomic bomb . That means it would get along well against a atomic bomb like the B41 , also recognise as the Mk-41 , which was made by the US during the Cold War era .

But against the 50 - megatonTsar Bomb , the most brawny atomic weapon ever make and tested ? Well , it does n’t bear thinking about .

When does the Cheyenne Mountain Complex close?

The doors on the ultra - inviolable military facility were slammed shut on 9/11 , and will do so again in the event of a serious threat , such as an identified projectile launching , or “ button - up scenario ” Mandrillus leucophaeus . Worthy threat for such a lockdown may be electromagnetic – from weapon system or the Sun – chemical , biologic , ornuclear , and any lingering fabric from these onslaught is maintain out thanks to a pressurized air system that protect the 300 - or - so citizenry walled up inside the Cheyenne Mountain Complex .

How did they build the Cheyenne Mountain Complex?

A staggering693,000 tonsof granite had to be shifted to make way for the Cheyenne Mountain Complex whose 15 spring - mounted building sweep 5.1 acres ( 2.1 hectares ) at a height of 2,915 meters ( 9,565 feet ) . Since it first became in operation on April 20 , 1966 , it ’s remained fighting , occupy , and prepared for emergencies of the apocalypse kind .

The stronghold houses a variety of military and civilian trading operations , including strain and outer space surveillance , ballistic missile Defense Department , emergency operations , and intelligence analysis . As such , if the son of a bitch hits the proverbial lover , it must stay on running to ordinate and communicate military intercession .

![cheyenne mountain complex blast door](https://assets.iflscience.com/assets/articleNo/73393/iImg/74906/cheyenne mountain complex photos.png)

The blast doors were closed on 9/11.Image credit: USAF photo,Public Domain, viaWikimedia Commons