On May 18, 1980, Mount St. Helens erupted — it was the "deadliest and most economically destructive volcanic event in the history of the United States," according to the National Oceanic and Atmospheric Administration, generating “about 500 times the force that the atomic bomb dropped on Hiroshima,” it killed 57 people and thousands of animals and lopped 1,300 feet off the top of the mountain.

Still, there's another volcano that is much more concerning to volcanologists. On this episode of America's National Parks, Washington’s Mount Rainier National Park, and its namesake volcano’s potential for mass destruction.