This film documents the building of Chicago Pile 1, which produced the first self-sustaining nuclear chain reaction. Constructed under Stagg Field at the University of Chicago in the fall of 1942, this is one of the seminal achievements of the Atomic Age. If atomic energy is the genie that came out of the bottle, this is the story of how the first bottle was built. The many problems faced by the scientific pioneers who built CP--1 and the importance of their work in developing the atomic bomb are explained through film, photographs and interviews with Arthur Compton, General Groves, and other key participants. USA, 1959, B&W/Color, 29 minutes.