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Nuclear engineer/amateur reactor historian here. Camp Century found here was famously powered by a small Army nuclear reactor called PM-2A. There's a really great documentary about it from the 1960s here: https://youtube.com/watch?v=28NYczAuXl4

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Correct me if I'm wrong, but wasn’t there a similar reactor on the other side of the globe, in Antarctica, around the same time?

You're correct. The one in Greenland was the PM-2A. The one in Antarctica was the PM-3A. List of these, with even more small Army microreactors, with videos for all here https://whatisnuclear.com/slides/reactor-history.html#/2/16!

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