I offer a pretty thorough explanation of this in the youtube video linked in my NOSTR profile.

Given the content of this thread, I think the whole episode is pretty applicable. I know it's long, but it's worth it, I promise.

It's really hard to TLDR that content but I'll try.

Because the 2nd topic can be a little doomy gloomy, I start things off with a white pill and some alternative history.

Then, I cover declassified US Air Force research from the 1940s and a book that was classified by the CIA in the 1960s on the same subject. This subject explains how some ancient lost civilizations were lost, as well as a number of other Earthly enigmas and legends.

Then I cover roughly 100 year old research on an ancient lost civilization that mutually validates several other important but not well known works.

Suffice to say, I'm so deep into this stuff that I even know that sarcophagi were not just stone coffins for Egyptian elites back in the day. They had another function that was leveraged for 2 separate purposes.