An atomic bomb mushroom cloud over Nagasaki. 9th August 1945. The plutonium爄mplosion-type燽omb (Fat Man) was dropped off a Boeing B-29 Superfortress named Bockscar; which had come from Tinian. An area about 2.3 miles by 1.9 miles was destroyed but other parts of the city were saved from the blast. The number of deaths might have been more than 75;000. Nagasaki was a major shipbuilding city and a large military port. But it was not a favoured target as it had been bombed five times in the previous twelve months. On燗ugust 15; just days after the bombing of Nagasaki and the燬oviet Union's燿eclaration of war; Japan announced爄ts surrender爐o the Allies.