Towards the end of the 2nd World War, on the early morning of 6 August 1945, a ball of fire appeared over the Japanese city of Hiroshima.

 

Rising to a height of 9000m, the large mushroom-shaped cloud of smoke and debris claimed 150 000 lives with most of the city. ​This was the first atomic bomb ever released.

 

So powerful the effect that only shadows of the people caught in the blast was left...

 

How was this explosion produced?