Challenger: Why Thiokol Engineers Opposed Launching in the Cold

The night before Challenger launched, engineers warned against flying in the cold. The recommendation changed. What happened to the warning? On January 28, 1986, seven people died aboard Space Shuttle Challenger. This documentary follows the O-ring problem, the earlier signs of damage, Morton Thiokol's launch-eve recommendation and management reversal, and the objections that never reached key launch officials. Through original NASA footage, primary documents and a clearly labeled technical reconstruction, we examine how a warning became permission to launch—and what changed afterward. Behind the Blunder tells the stories of what went wrong, and why. Subscribe for more:    / @behindtheblunder   WATCH NEXT Hyatt Regency Collapse: How a Design Change Became a Disaster    • Hyatt Regency Collapse: How One Design Cha...   CHAPTERS 00:00 The warning 00:26 Seven people, a working mission 01:22 A seal that had to move 02:27 The earlier warnings 03:21 The night before 04:26 What changed? 05:17 The missing information 06:04 Seventy-three seconds 06:54 What remains REMEMBERING THE CREW Francis R. “Dick” Scobee, Michael J. Smith, Judith A. Resnik, Ellison S. Onizuka, Ronald E. McNair, Gregory B. Jarvis, and S. Christa McAuliffe. SOURCES & ARCHIVE Report of the Presidential Commission on the Space Shuttle Challenger Accident (Rogers Commission): https://ntrs.nasa.gov/citations/19860... NASA's implementation report and redesigned joint: https://www.nasa.gov/history/rogersre... NASA Challenger film record: https://ntrs.nasa.gov/citations/19940... NASA STS-26 return-to-flight record: https://ntrs.nasa.gov/citations/19940... Archival footage and photographs: NASA/Kennedy Space Center, NASA/Johnson Space Center, and the STS-51L Photo and TV Analysis Team. STS-51I transfer via the National Space Society; investigation and STS-26 transfers via the Internet Archive. Archival source sound is excluded. NASA analysis replays and simplified reconstruction are identified on screen. Commission report-release footage: Courtesy Ronald Reagan Library; White House Television Office, June 9, 1986, Master Tape 529, National Archives ID 77442994. https://www.reaganlibrary.gov/galleri... Arlington Challenger memorial photograph: NASA/Keegan Barber, January 25, 2024. Thumbnail: NASA, 51L-S-156. Map data: Natural Earth. Archive use does not imply endorsement. MUSIC “Katabasis I” and “Signal to Noise” by Scott Buckley — released under CC-BY 4.0. www.scottbuckley.com.au https://www.scottbuckley.com.au/libra... https://www.scottbuckley.com.au/libra... https://creativecommons.org/licenses/... Includes the official no-piano-melody mix of “Signal to Noise.” Excerpts were edited, equalized, faded and mixed to follow the narration. #Challenger #SpaceHistory #BehindTheBlunder Thumbnail artwork: original labeled seal illustration with an archival-photo derivative. Photo: NASA, image 51L-S-156. https://images.nasa.gov/details/51l-s... Photo: U.S. government original/public domain. Foreground is illustrative.