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*Warning:* This video contains historical scenes of violence that may shock an unprepared audience. In the early morning hours of August 6, 1945, the American bomber Enola Gay flies over Japan with the deadliest bomb ever dropped in its cargo bay. It was about to carry out the first nuclear attack in history. La Grande Explication tells the story of this ultimatum that changed the course of history, killing 70,000 people in a split second. An episode that allows us to better understand the reasons that pushed President Truman to take this unprecedented decision and the consequences of this indelible drama.