There's a lot of myth and ancient legends insinuating that we're only building our world on top of pillars built by "those who came before", but that's quite ex

There's a lot of myth and ancient legends insinuating that we're only building our world on top of pillars built by "those who came before", but that's quite expected considering that there are abandoned human settlements spread all over the globe. Every generation has seen more and more of those abandoned settlements as time has passed, and so those legends were born. That doesn't mean we _know_ there's been civilizations that were wiped out during the last ice age, though. All evidence is circumstantial at best. It would be awesome if those bots found something, though.