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likely: NOTABLE
Project Iceworm and the under-ice labyrinth
In 1959 the US Army began building a network of tunnels under the ice in Greenland's remote north-west.
The tunnels were to house a military base, and form an under-ice labyrinth connected by railway tracks.
The US Army plan, known as Project Iceworm, was to stash nuclear weapons in the ice tunnels, which were within striking distance of the Soviet Union.
In the event of nuclear war with the Soviets, the weapons could be moved undetected under the ice via the railway, popping up to launch in a kind of nuclear Whac-A-Mole.
The staging post was Camp Century, an under-ice base powered by a portable nuclear reactor, that the US claimed was purely an Arctic research station.
In the end, around 3 kilometres of tunnels were built — falling far short of the ambitious hundreds to thousands of kilometres slated in the plan. There was a kitchen, dormitories, cafeteria, theatre, chapel, and library, as well as the power station.
The nuclear weapons never made it, nor was permission sought from the Danish government to go ahead with the nuclear plan, declassified documents show. But some good science did actually get done.
https://www.abc.net.au/news/science/2023-07-21/greenland-ice-core-secret-us-army-base-reveals-dramatic-melting/102609654