It was the training site of the 509th Composite Group, the B-29 unit that dropped the Hiroshima and Nagasaki atomic bombs.

Charles Sweeney, 84, pilot of Bockscar, the B-29 that dropped the Nagasaki atomic bomb.

In comparison, Fat Man, the Nagasaki bomb, was 22 kilotons, one-third as powerful.

The resulting explosion is estimated to have a force of 26 kilotons, slightly more powerful than the Nagasaki atomic bomb.

The Jesuit Pedro Arrupe was a witness of the Nagasaki atomic bomb in 1945.

Explode with such violence as to make the Nagasaki bomb seem like a popgun?

A very similar mishap happened less than two weeks after the Nagasaki bomb, claiming the life of Harry Daghlian.

(The Nagasaki bomb was 20 kilotons).

Of those, only the B Reactor, which made plutonium for the Nagasaki bomb, is being proposed for eventual year-round tourism.

The Nagasaki bomb, Fat Man was also an implosion device.