Under the bubbling hot springs and geysers of yellowstone national park is a supervolcano. Most people don't Know It's there. The caldera is so large that it can only be seen from a plane or satellite. It just could be o...Under the bubbling hot springs and geysers of yellowstone national park is a supervolcano. Most people don't Know It's there. The caldera is so large that it can only be seen from a plane or satellite. It just could be overdue for an eruption, which would change the landscape and climate of our planet.