I'm not sure whether there is anything about Admiral Byrd in the links I sent or not. I watched them awhile ago and I don't remember offhand. I sent you everything that I have. There is a lot of good stuff in there about the Nazis and their underground facilities.

Yes, Byrd would be a good rabbit hole to go down.

In a nutshell, it's been said that there are underground ice caves formed due to thermal waters. The Nazis created underground bases which are supposed to be quite temperate. Supposedly, remains of ancient civilizations were found, along with some aliens or reptilians living in the warm caves.