Not sure if already covered but I thought it of interest

Greenland's receding icecap to expose top-secret US nuclear project

Camp Century – part of Project Iceworm – is an underground cold war network that was thought to have been buried forever

“They thought it would never be exposed,” said Colgan.

"Project Iceworm, presented to the US chiefs of staff in 1960, aimed to use Camp Century’s frozen tunnels to test the feasibility of a huge launch site under the ice, close enough to fire nuclear missiles directly at the Soviet Union."

"From 1964 Camp Century was used only intermittently, and three years later it was abandoned altogether, the departing soldiers taking the reaction chamber of the nuclear generator with them.

They left the rest of the camp’s infrastructure – and its biological, chemical and radioactive waste – where it was, on the assumption it would be “preserved for eternity” by the perpetually accumulating snow and ice."

https://www.theguardian.com/world/2016/sep/27/receding-icecap-top-secret-us-nuclear-project-greenland-camp-century-project-iceworm