Camp Century

Camp Century was an Arctic United States military scientific research base in Greenland.[1] It is situated 150 miles east of Thule Air Base. It was part of Project Iceworm to install sites for launching nuclear missiles in Greenland. Powered by a nuclear reactor, the camp operated from 1959 until 1967. The base consisted of 21 tunnels with a total length of 9,800 feet (3.0 km).

> nuclear powered btw

https://en.wikipedia.org/wiki/Camp_Century

https://youtube.com/watch?v=-DPQ15EgyTY