The Most Watched Disaster In Human History | What Went Wrong: Countdown to Catastrophe

In 1986, the space shuttle Challenger exploded 73 seconds after launch due to a failed O-ring seal in the solid fuel booster. The explosion resulted in the tragic deaths of seven astronauts, including teacher Krista McAuliffe, and raised doubts about NASA's management of the complex Space Program.

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Survivors and first responders recall some of the greatest disasters of modern history and how engineering errors were frequently responsible for the traumatic events.

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