The beauty of America's Yellowstone National Park masks one of the rarest and most destructive forces on Earth - a supervolcano.
A two-part 91Èȱ¬ factual drama asked: 'What if Yellowstone erupted?'
Elsewhere in Supervolcano
Supervolcano
Read about the programmes, including the behind-the-scenes documentary 'Supervolcano: The Truth About Yellowstone'.
The world's biggest bang
Mass starvation could follow a super-eruption, if the Asian Monsoon rains fail as experts predict.
Photo gallery
See dramatic scenes from the programmes and download desktop wallpaper for your computer.
How would you respond to a disaster?
Play an interactive game where it's your job to handle an eruption of the fictional Mount Spur in Bluebear County.
