I have no idea what possessed my brain, I know this material backwards, but the above statement is an error.Posted by Mark (Star Mariner) (here)
I have long theorised these 'ultra-terrestrials' are indeed not alien but pockets of Atlantean civilization that survived their ancient apocalypse. I think I pointed it out elsewhere, but that date of 70,000 years ago corresponds exactly with the date Cayce gave for the first (of three) Atlantean disasters.
The first Atlantean disaster occurred at 50,000 BC (50,700 BC to be exact), not 70,000 BC. The second disaster is dated at 28,000 BC, the third and final one that resulted in the total destruction of the remaining cluster islands was in 10,600 BC.
There was however a major cataclysm approximately 70,000 years ago (which I was reading about recently and may have confounded my error). This was the Toba event, an eruption of a supervolcano that devastated the planet, plunging it into a volcanic winter. Some estimates claim the global human population dropped to as little as ten thousand.