Once upon a time the US Navy went on a scientific expedition based upon the theory of a hollow earth. They murdered swaths of innocent people and the commander went insane, beating and kidnapping most of his own crew.
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sources:
https://www.sil.si.edu/DigitalCollections/usexex/
https://archive.org/details/seaofgloryameric00phil
https://www.chimuadventures.com/blog/2016/08/charles-wilkes/
