How many people were killed by the atomic bomb that was dropped on Hiroshima ?
The Nagasaki mission is described , showing the two plants that were the basic targets , and the valley that they planned to bomb , and then shows the mushroom cloud , " The baptism of the aggressor nation " At the end , the film takes a rather sober view of the future of atomic power , showing an " atomic shadow " of someone in the Hiroshima blast , saying that this could be someone of any race or creed , and that the future of atomic power could help mankind , or destroy it , depending on how people use it .