[kach22i]

I thought Byrd was at the North Pole and conjured the hollow Earth theory.

I've read different stories over the years, all very entertaining.

I'm not sure what to make of it, but it is fascinating.

EDIT: found this.

http://exopolitics.org/did-us-navy-battle-ufos-protecting-nazi-antarctic-sanctuary-in-1947/

Admiral Byrd’s statements were published in the Chilean Press but never publicly confirmed by US authorities. Indeed Byrd did not speak again to the Press about Operation Highjump, leaving it for researchers to speculate for decades over what really happened, and why Byrd was silenced.