It was the early hours of 16 July 1945, and Robert Oppenheimer was waiting in a control bunker for a moment that would change the world. Around 10km (6 miles) away, the world's first atomic bomb test, codenamed "Trinity", was set to proceed in the pale sands of the Jornada del Muerto desert, in New Mexico.
Oppenheimer was a picture of nervous exhaustion. He was always slender, but after three years as director of "Project Y", the scientific arm of the "Manhattan Engineer District" that had designed and built the bomb, his weight had dropped to just over 52kg (115lbs). At 5ft 10in (178cm), this made him extremely thin. He'd slept only four hours that night, kept awake by anxiety and his smoker's cough.
