At 8:15 AM, Everything Changed: 43 Seconds That Destroyed Hiroshima and Changed History ForeverAt 8:15 AM, the US atomic bomb turned Hiroshima into a symbol of unimaginable destruction. In just 43 seconds, thousands of lives were lost, leaving behind a painful legacy of survival, memories and a world changed forever. This is the story of the 43 seconds that changed history forever. From Ruins to a Global Monument of PeaceDespite the destruction, Hiroshima managed to recover in the coming years. The Long Shadow of Hiroshima: Health Effects That Continue Generations LaterThe impact of the Hiroshima bombing did not end with the explosion.