The invention of the atomic bomb was known as The Manhattan Project, with research and design led by Robert Oppenheimer.

Young American scientist Bill Wilcox was part of the team which helped make the bomb, he told Louise Hidalgo about his top secret work which began in 1943.

He recalls the “privilege of being part of a remarkable group of people”.

This programme has been updated since the original broadcast.

(Photo: The first atomic bomb test in the United States. Credit: Getty Images)