July 16, 1945.
This is a description of the first atomic explosion in New Mexico. Oppenheimer and Fermi were there, and had a $50 bet on whether or not the explosion would set the atmosphere on fire! Oak Ridge facility in Tennessee had used 10% of the total electricity in the USA to refine enough material to make the bomb.
"Time: 0529:45 The firing circuit closed; the X-unit discharged;the detonators at thirty-two detonation points simultaneously fired; they ignited the outer lens shells of Composition B; the detonation waves separately bulged, encountered inclusions of Baratol, slowed, curved, turned inside out, merged to a common inward-driving sphere; the spherical detonation wave crossed into the second shell of solid fast Composition B and accelerated; hit the wall of dense uranium tamper and became a shock wave and squeezed, liquefying, moving through; hit the nickel plating of the plutonium core and squeezed, the small sphere shrinking, collapsing unto itself, becoming an eyeball; the shockwave reaching the tiny initator at the center and swirling through its designated irregularities to mix its beryllium and polonium; polonium alphas kicking neutrons free from scant atoms of beryllium; one, two, seven, nine, hardly more neutrons drilling into the surrounding polonium to start the chain reaction. Then fission multiplying its prodigious energy release through eighty generations in millionths of a second, tens of millions of degrees, millions of pounds of pressure. Before the radiation leaked away, conditions within the eyeball briefly resembled the state of the universe moments after its first primordial explosion."
from The Making Of The Atomic Bomb ~ Richard Rhodes