As the five men crane their necks a plane comes into view overhead - and drops a nuclear bomb right on top of them.

This Cold War-era video by the U.S. Air Force was supposed to reassure the public that nuclear power was safe at a distance, yet does anything but.

The five men - who incredibly were all volunteers - cower in shock as a thunderous explosion cracks through the sky, causing the ground to shake violently.

Screaming 18,500 feet above them were two F-89 jets, one of which fires off a two kiloton nuclear missile with an atomic warhead inside it.

The men are given no protection and only have their desert fatigues to stop the deadly effects of the blast.

Only one of the five even has sunglasses.