In October 2008, an Airbus A330 cruising over the Indian Ocean suddenly pitched itself into a violent nosedive, twice, throwing passengers and crew into the ceiling and injuring dozens. The autopilot was off, the skies were clear, and nothing the pilots did seemed to explain why the jet kept trying to fly itself into the water. This episode reconstructs the emergency aboard Qantas Flight 72 through cockpit accounts, passenger testimony, and animated recreations of the aircraft's flight data, tracing investigators' hunt for a cause back to a single faulty angle-of-attack sensor feeding bad data into the plane's flight control computers. Captain Kevin Sullivan's decision to divert to a remote airstrip in Learmonth, Western Australia, with dozens of injured on board, anchors the back half of the film. The investigation that follows exposes a software flaw capable of overriding pilot input on a modern fly-by-wire airliner, and the fixes Airbus made afterward to stop it from happening again.