On August 6th, 1945 a weapon unlike any other was unleashed on the Japanese city of Hiroshima. Four days later, the Japanese surrendered, having been subjected to horrors and devastation previously unknown and unimaginable. A team of scientists and experts from the Manhattan Project was ordered by President Truman to investigate the facts of what really happened when the atomic bomb exploded over Hiroshima. Revealed is what happened moment by moment in those first 24 hours.

Bonus program: Secret history of the atom bomb.