We haven't caught up with antediluvian technology. We are just barely getting to the point where we can guess at what they had. We still haven't figured out the pyramids, and I'm not talking how they built them, I'm talking what they did. I have one theory, but don't know for sure it is correct and don't know if it isn't merely one of many things the pyramids were doing. For the most part, that technology is beyond our reach. All we have left is myths.Well, I'll tell you....... if our civilization suddenly goes down, if the satellites are wiped from the skies and there is enough time lapsed before anything of substance rises again, anything on "hard copy" (aka paper) will be gone. All of our information will be floating around in the air with no means to grab it. And anything that is developed to grab information from the cloud will not be anything like what is currently used, so our technology will be forever inaccessible and - gone. It is quite possible that mankind has reached the level where we are now before. And of course they didn't write all of their information in stone. So.........if they had technology, it's gone.
Now, if the technology was truly only a 1000 years old, as they say those Hindu temples are, then we would still have the technology. 4000 years ago the Egyptians made monatomic gold, and we still have that, we know how to make it. Nothing like super high technology was lost from 1000 years ago, it simply didn't exist in Vietnam 1000 years ago. They had mud huts deep in the jungle. They fished in the rivers by hand. I don't think they had a network of satellites and the ability to poured molten stones into giant molds and build giant complexes with modular sections weighing 100 tons; all highly crafted sections and then assemble them perfectly in alignment to the solstices. Deep in the Vietnam jungle? 1100 years ago? It is sheer lunacy.
Yeah, the ice cap was broken up, evaporated and rained back to earth some 400 feet of mean sea level. That's going to erase all civilization. 10,000 years is going to turn everything back into dirt... except the stone. It is amazing that myths survived. We found a satellite still in polar orbit. Our satellites all fall back to earth, they don't last very long, not the ones down low under the magnetosphere. And we haven't been able to achieve a polar orbit yet. Which... that's a way better orbit for mapping the earth. There was probably a bunch of those; hence, the perfect alignment of all these antediluvian structures.
Places like Stonehenge, were probably observatories. the temples and pyramids were also calendars, that's why they were perfectly aligned N,S,E,W. But there was much more going on there and the math they used to build them... it was way beyond geometry.
Basically, modern man is akin to a planet of apes inheriting the earth from some pretty sophisticated humans that were all drowned like rats. Atlantis and Mu both went under the waves. It takes thousands of years to build up technology, once you lose it... you have to start over.