Has anyone else come across this? Its Documented in US History archives admiral Richard E Byrd attended the south pole "Operation High jump" and he came across an advanced race or technology in the Antarctic.
Is there more too this than i have researched or/and has anyone considered a quest to find out more? Possibly the most dangerous quest on the planet and it could be a one way trip...
BBNWR, when you say "researched" do you mean that you've just watched a whole load of conspiracy documentaries on YouTube?
As it happens, I'm pretty fascinated by conspiracies. Not the loony ideas themselves but rather the mentality/mental illness that causes them.
There's a good documentary on Netflix called "Beyond The Curve". It turns out that most Flat Earthers are just sad lonely people who want to feel a part of something big and will deny reality if it doesn't fit what they want it to be, and the higher figures in the movement are attention-loving frauds who get off on having some sort of authority (even if that authority is only over sad, lonely people who want to feel a part of something). It's almost the exact same mindset as religion actually.
I don't think there are any documentaries about people who think that advanced civilisations live inside the Earth though. But give it time! :D