The bomb dropped from 9600 metres of altitude to explode around 500 metres from ground.
Three days after hHroshima, the 9th August at 11h 02, two B29 bombers, that had flown over the peninsula of Shimamara, arrived above Nagasaki coming from North-East and launched the second plutonium bomb in the North of the city. Paul Tibbets the pilot of the Enola Gay who drop the bomb, considered in the USA an hero at the time, never expressed during his long life much regret on the death of thousands of innocent victims. The uranium bomb was dropped on Hiroshima on the 6th August 1945. This enabled him to tell Stalin that the United States had a new and terrifying weapon against Japan. President Truman received the news at the Potsdam Conference, which was being held at the same time.
It was estimated that the energy of the explosion was divided as follows: 35% as heat, 50% for the blast and 15% in the form of radioactive energy. The strong expansion of the air around the epicenter generated a blast. A huge fireball was created immediately after the explosion accompanied by a wave of heat and extremely high radioactivity. The energy of the plutonium bomb dropped on Nagasaki, nicknamed FAT Man, was estimated at 21 kilotons of TNT.