If you plan to watch Oppenheimer, then be sure to watch this absolute gem of a documentary, which features many interviews with the Nobel Laureates who worked under Oppenheimer during The Manhattan Project, to have the proper context. For my money, there is nothing more valuable than the original source, even it is a bunch of really lovable old men.
Pay close attention to the fact that Leslie Groves ignored all the gossip around Oppenheimer and fought to assign him as the leader of the project. This critical decision by a legendary general and even more legendary manager is a beacon for our time: the character and capabilities of people are infinitely more important than their perceived politics. Groves was perhaps the greatest judge of character.
Peripherally, the documentarty revives the ultimate debate between which is harder, science or engineering. All the scientists interviewed in this film agree that the atomic bomb was conceptually simple, and its realization was a matter of mere engineering. Who wants to dive in?