In 1945, the first atomic bomb was set off during the Trinity Test in the New Mexican desert. This marked the birth of the Atomic Age, a period of nuclear experimentation that would alter the world on a sociocultural level, not to mention an elemental one.
Today we know the danger of exposure to atomic bombs. First there is the initial fiery explosion, caused by the splitting of an atom. However, the arguably more dangerous effect of the atom bomb is its radiation, both from the original blast and the residual radioactivity left in its wake. This can spread over a miles-long diameter, but is most concentrated at ground zero, the point directly underneath the detonation. Hence why this video of five men standing directly beneath an atomic bomb test is a bit disturbing.