Though digital filmmaking is ascendent, America’s motion picture history and heritage is preserved in film. And that film is preserved in the Library of Congress’ Packard Campus in Virginia.

But it’s not sitting in any old archive. It’s in a nuclear bunker originally built during the Cold War to house the President in the event of a nuclear exchange.

Great Big Story explores the facility and the work of archivist George Willeman who is tasked with preserving the most volatile and dangerous of the old reels–the nitrate film. Enjoy.