At the height of the Cold War, the United States and Soviet Union had thousands of Intercontinental Ballistic Missiles trained on one another. In this video, we get a tour of a Titan missile silo, and learn exactly what would happen when the order came down to launch an attack.

Veritasium has been posting some interesting videos about science, and this latest one takes you through the step-by-step process that airmen would have had to go through in order to prepare and launch a missile against the Soviet Union. They head over to the The Titan Missile Museum of Green Valley, Arizona to see what it was like.

What’s really interesting is the way the design of the silos are the designed to prevent a single person from launching a missile by themselves: there’s numerous fail safes built into the actual mechanics of pushing the buttons, turning the keys, to even the distance between launch keys.