NASA scientists have rediscovered an abandoned U.S. nuclear base buried beneath Greenland's ice sheet since the Cold War.
During a research flight over the Arctic Circle last spring, the team detected a vast network of tunnels and structures hidden deep within the ice.
The site was later identified as Camp Century, a military outpost built as part of Project Iceworm—a secret Pentagon project which aimed to build nuclear-missile launch sites beneath the ice that could target the Soviet Union.