It's a docudrama of the historical Manhattan Project, the creation of the atomic bomb. The premise is a film buried with the time capsule to be opened in the 25th century. It tells the political story as well as the actual research and manufacturing of the bomb. It's more revealing than I expected for those post-war times. The science is not explained that well. I doubt that the layman of those days would come close to understanding the science anyways. As a movie, it's functional and that's more than enough.
Review of The Beginning or the End
