[hutzlibu]

I think for steam engines and laser tech, there would have to be some sort of evidence to be found. The only slightly "plausible" theory might be, if a advanced civilisation would have had psychic powers (quantumnwaves something) and no need for conventional tech, then there is a reason nothing can be found today. And then of course there was a global mage war, with all the psychic powers burned out of the minds of human.

(I do recommend the Illuminatus! Trilogy from Wilson and Shea, for interesting alternative history fantasy and all kinds of crazy stuff)

[ulizzle]

I made that up about the psychic powers because I thought it was funny but that’s why people doubt Hancock. An advanced civilization, whether here or in space, leaves debris.

If we can find the Titanic we should be able to find the Atlanteans. Maybe.

[hutzlibu]

Well, I am not an expert in obscure experts, but I know that on 2 occasions people told me in all seriousity the idea of a psychic advanced Atlantis and mentioned a name who discovered it, but no Idea if that was Hancock.

And that lost civilisations existed, I have no doubt.

But likely not with laser tech.

[midoridensha]

>An advanced civilization, whether here or in space, leaves debris.

Not really. Just look at abandoned places today, and you can see how quickly nature takes them over and erases them. Sometimes traces can be found, like ancient cities that are sometimes found in the jungle of central America, but that's after ~500 years or less. On much longer timescales, nature and geology bury or destroy most evidence. If you're really lucky, something might be dug up, but that's rare. The only reason so many prehistoric fossils (dinosaurs etc) have been found is because there are SO many of them: they existed for hundreds of millions of years, all over the planet, so we've captured a tiny slice of what lies beneath the surface.

Perhaps there's some evidence of a past advanced civilization buried somewhere, but we haven't found it yet.

The Titanic is barely over 100 years old, so of course it's (partially) still there.