The Night Before Challenger: Engineers Said Don't Launch

On the night of January 27, 1986, the engineers who designed the Space Shuttle booster seals told NASA not to launch Challenger in the cold. Before midnight their own company reversed them, and the next morning seven people died. This is how a room of careful, competent people chose wrong without feeling they were choosing wrong: the O-ring erosion known since 1981, Roger Boisjoly's memo six months early, the launch constraint waived six times, the half hour on mute, the four votes, Feynman's glass of ice water, and Diane Vaughan's 'normalization of deviance'. CHAPTERS 0:00 Go with throttle up 0:25 The night before the launch 1:10 One rubber ring 2:25 Warnings since 1981 4:02 Six waivers in a row 4:29 The memo: 'loss of human life' 5:43 January 27, 1986 6:35 The teleconference 7:50 The question flips 8:48 Thirty minutes on mute 10:38 The man who refused to sign 12:03 The coldest launch 12:56 Feynman's glass of ice water 14:32 What happened to the engineers 15:25 The normalization of deviance 16:50 Columbia, 2003 17:33 The question for you SOURCES Report of the Presidential Commission on the Space Shuttle Challenger Accident (Rogers Commission), 1986, vol. I chapters I-IX, and vol. II Appendix F (R. P. Feynman, 'Personal Observations on Reliability of Shuttle'). Testimony of Roger Boisjoly, Allan McDonald, Lawrence Mulloy, Jerald Mason and others, as quoted in the Rogers Report, ch. V. NPR: 'Remembering Roger Boisjoly' (2012); '30 Years After Disaster, Challenger Engineer Still Blames Himself' and 'Your Letters Helped Challenger Shuttle Engineer Shed 30 Years Of Guilt' (2016); 'Remembering Allan McDonald' (2021). AmericaSpace, 'A Catastrophe of the Highest Order' (2012). Literary Hub, on Feynman and the commission. Diane Vaughan, The Challenger Launch Decision (1996), via the SAGE Encyclopedia of Criminological Theory entry. Columbia: NASA and the Columbia Accident Investigation Board, as summarised in public sources. Where sources disagree (the exact wording of 'next April?'), the video says so. CREDITS Archival audio: original NASA launch commentary and crew walkout commentary, 28 January 1986 (public domain). Original pages of the Rogers Commission Report shown from the 1986 printed volume (scan via archive.org). Public domain: NASA photographs and films (STS-51L launch film and 'Space Shuttle Challenger Accident Investigation', 1986, via archive.org; NASA Image and Video Library); figures from the Rogers Commission Report (U.S. government publication); Allan J. McDonald, 2012 (NASA / Sean Smith). CC0: Richard Feynman's Los Alamos badge photo (Los Alamos National Laboratory, courtesy AIP Emilio Segre Visual Archives). HOW THIS VIDEO WAS MADE Illustrated images were generated with AI (Ideogram) and show anonymous people, not real individuals; diagrams and animated graphics are ours. The narration is a synthetic voice; quoted words of real people are read, not recorded. Music generated with an AI music model. Facts come from the documents under SOURCES. Spot an error? Tell us in the comments.