Colorado generated a lot of dangerous nuclear waste during the cold war. It came from a nuclear trigger factory at the Rocky Flats Plant -- near Denver. Now, that waste sits deep underground in New Mexico in America's only permanent solution to dispose of radioactive nuclear waste for the long term. But how do you warn people of the danger that lies underground for the next 10,000 years? That's how long it takes for radioactive plutonium to disappear and it's the subject of a documentary called "Containment," being featured at the Denver Film Festival.

Peter Galison and Robb Moss are the filmmakers behind "Containment." They spoke with Ryan Warner.