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How Did The Apollo 11 Documentary Get Film Of The Upper Stage Ignition?

An 11-minute video by Scott Manley about spaceflight, on the Space shelf. It came up in r/space, in a thread called “If you haven't seen it, check out last year's «Apollo 11». It's all archival footage from 1969, restored to 4K in mind-blowing quality. The level of presentation, editing, and score make it feel like a dramatic sci-fi epic. I did not expect to cry at a "space documentary"”.

Scott Manley, Video, 11 min, 2019, on the Space shelf

How the Apollo 11 documentary obtained film of the upper-stage ignition.