Deep beneath Greenland's ice sheet lies a secret nuclear-powered city that the U.S. military tried to bury forever. Camp Century was sold to the world as a peaceful research station, but declassified documents reveal it was actually a test site for Project Iceworm—a terrifying plan to hide 600 nuclear missiles under the Arctic ice. Now, as climate change melts the ice, the toxic legacy they left behind is becoming a modern environmental crisis. This is the complete story of Camp Century: the cit