Inside the secret US military base hidden 100ft beneath Greenland’s surface.

President Donald Trump has spent his first weeks in office calling for the U.S. to buy Greenland while refusing to rule out the possibility of military force — even as officials declare the country isn’t for sale.

Trump claims the U.S. needs to own Greenland in order to address national security concerns — and it’s not the first time the country’s strategic importance has been the focus of the U.S. military.

More than six decades ago, the U.S. Army Corps of Engineers was hard at work on a project in Greenland: Camp Century.

The project itself, set in a military base with two miles of tunnels, wasn’t entirely classified. Journalists were invited to visit the area, and the army advertised it as a nuclear power base, National Geographic reports.

But hardly anyone knew the truth: Camp Century was also developing Project Iceworm, a network of complex tunnels and railway tracks that could house and transport some 600 nuclear missiles. These missiles could then be shot over the north pole toward the Soviet Union.

Now, new information on the mysterious base has come to light.

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