On January 28, 1986, the Space Shuttle Challenger broke apart 73 seconds after launch, killing all seven astronauts aboard, including schoolteacher Christa McAuliffe. The film reconstructs the countdown and the freezing Florida morning that preceded liftoff, using archival NASA footage, mission control audio, and news broadcasts from the day. Engineers at Morton Thiokol had warned that cold temperatures could compromise the O-ring seals on the solid rocket boosters, and the film traces how those warnings were overridden in the hours before launch. Investigators and former NASA officials describe the Rogers Commission inquiry that followed, including Richard Feynman's public demonstration of a rubber O-ring stiffening in ice water. The film lays out the chain of technical and managerial decisions that turned a known risk into a catastrophe broadcast live to schoolchildren across the country. It closes on the program's long recovery, grounded for over two years while NASA rebuilt both its hardware and its safety culture.