On Christmas Eve 1971 a 17-year-old fell two miles into the Amazon rainforest still strapped to her airline seat, the sole survivor of 92 people aboard Lansa Flight 508. This episode dissects the story of Juliane Koepcke and the physics and psychology of surviving the impossible.

We examine how a lifetime of wilderness training carried her through the aftermath of being the only one to walk away.

• Her upbringing at the Panguana research station, where her zoologist parents taught her jungle survival.
• The scheduling pressures and Lansa's poor safety record that placed the family on the doomed flight.
• The physics of her survival, from spinning seats and thunderstorm updrafts to the forest canopy.
• Her eleven-day trek through the jungle following moving water despite severe injuries and infestation.
• The ...