[Paul T]

hard to say whether or not advanced civilizations really existed, however, there is plenty of evidence of prior mass extinction events such as a pole shift that wiped out huge portions of the population, probably 99%. These events have also been written about for thousands of years in just about every civilization over the world. Things like Frozen mammoth with undigested food in its stomach that was not known to grow anywhere near where the bodies were found frozen. Coral, fossilized fish and evidence of prior docks on a mountain 2 miles above sea level. Tons of examples abound. Many think these things happen every 6000 years or so and that we are ripe for another one very soon. Who knows?

EDIT: If you go to cia.gov and search for The Adam and Eve Story, there is a very short document there that details what this may look like. Interestingly, this entire paper was classified for decades, and is now out there partially declassified. My guess is the still classified parts are where the safest places would be for a future event, which is where all the secret bunkers probably are. I’ve read a few books on the subject also, it’s pretty interesting to consider. Most of my existence is at or near sea level so I’m an instant goner!

EDIT2: There are some seemingly random stuff (newspaper articles) for some reason embedded in the .pdf at cia.gov, not sure why.