Deep beneath the geysers of Yellowstone lies a hidden terror: a magma chamber 50 miles long. This documentary investigates the catastrophic potential of a Supervolcano, an eruption 1,000 times more powerful than Mount St. Helens. You can now become a History Hit member right here on YouTube! Join...
50 min - Disasters & Survival - Spark
More: Earthquakes, Volcanoes & Tsunamis documentaries