During the Cold War, the US Army studied the feasibility of launching ballistic missiles from within Greenland’s ice sheet. When the project was done, engineers buried biological, chemical, and radioactive waste in the ice thinking it would be preserved for eternity. Shame they didn’t know about global warming.
Camp Century-aka "Project Iceworm"-was a "city under ice," according to the U.S. Army, a "nuclear-powered research center built by the Army Corps of Engineers under the icy surface of Greenland," as Frank J. Leskovitz more specifically explains.
In 1959, the US Army began building an immense complex underneath the frozen surface of Greenland. It would be a center of research, to the benefit of mankind! It would also be a great place to launch Cold War nukes.