During World War II, the United States dropped two atomic bombs on Nagasaki. Why did one of them fail to explode?

"Little Boy" and "Fat Man".

On August 6, 1945, "Little Boy" was dropped on Hiroshima, Japan.

On August 9, 1945, "Fat Man" was dropped on Nagasaki, Japan.

However, the first question that needs to be clarified now is: Was the United States dropping one atomic bomb on Nagasaki that year or two?

A private document later disclosed proved that the "possibility" of dumb bombs existed, or was a fact. Because the person who provided this "private material" was none other than Groves, the official head of the "Manhattan" Project and later retired Army General.

On July 24, 1945, Groves drafted four targets for the use of atomic bombs against Japan in his report to General Marshall. They were Hiroshima, Nagasaki, Kokura, and Shinbo. . At the end of July, three goals were finally determined. Groves' memoirs wrote: "Hiroshima was the first target, Kokura Arsenal and Kokura were the second targets, and Nagasaki was the third target." For this reason, Groves served as the Air Force's target for the drop mission. The 509th Flying Group prepared three atomic bombs.

When Hiroshima was bombed on August 6 and Truman issued an ultimatum to Japan, the Air Force actively prepared to bomb the next two targets.

The second atomic bomb attack on Japan was scheduled for August 9. At 3:49 this morning, two "B-29" bombers each carried a "Fat Man" ("Fat Man" was Churchill's nickname to refer to the implosion atomic bomb) and took off from Tinian Air Force Base in the United States. It was accompanied by two reconnaissance aircraft.

When it flew over Kokura, the clouds were rolling in and the smoke was thick, making it impossible to observe the target with the naked eye. Bad weather saved Kokura and thousands of its citizens.

After 45 minutes of ineffective efforts, the "B-29" had to divert to its second target—Nagasaki. It was still cloudy and foggy here, making it difficult to identify the target, so it was decided to use radar-guided bombing instead. But at this moment, a cloud of mist suddenly opened in the sky, revealing a large clear hole. Through the big hole, the crew could clearly see an airport runway... They did not hesitate and pressed the switch decisively, and the two "fat men" with parachutes pounced down with a shrill roar; then they rowed out A flash of lightning formed a huge fireball...