Shot of a B-50 bomber in flight. Inside of the airplane, the pilots and crew inspect their instruments. A crew member counts off time by his watch. The pilot wears and oxygen mask. Shot of the bomb bay doors opening and the bombardier getting ready to aim the bomb. Shot of a hand on a dial. The crow puts on dark goggle. Shot of several observers on the ground sitting and wearing goggles. The bomb explodes on a target on the ground and a nuclear explosion results. Shot of the mushroom cloud expanding.