X-Ray Earth shows that the largest volcano on the planet lies beneath Yellowstone National Park. It has erupted many times before - on a scale so big it has plunged the earth into a volcanic winter. No one alive has ever witnessed such a catastrophic event. Now the race is on to find out what could trigger a future eruption and how much warning we would get.

Originally released by National Geographic, 2020. Streaming video file encoded with permission for digital streaming by Infobase on January 05, 2023.