In 1960, the United States Army launched a program called "Project Iceworm", a plan to build launch sites for nuclear missiles under the northern Greenland ice sheet, to provide the missiles with closer access to the Soviet Union. To test the feasibility of this concept, the Army established a base called Camp Century, a functioning military site consisting of tunnels and chambers carved directly into the ice. However, the site's engineers soon found that the glacier that the base was built into isn't a stable mass of ice, but instead flows at a slow rate, deforming the base's tunnels. This resulted in Camp Century's abandonment in 1966.
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