It's kinda insane how so much of our technology is dependent on a tiny number of company, like that one in The Netherlands that sells ultraviolet lithography to all the major chip fabrication plans (TSMC, Samsung, Intel). It wouldn't take much serious war or natural disaster to set our plant back a decade or two if it occurred in the wrong place.

Are you familiar with Göbekli Tepe or the Richat Structure in Africa? There are a growing number of people who think human civilization goes back past 12k~13k years. Göbekli Tepe is the oldest stone mason structure found, and the Richat may be the footprint of Atlantis. Many ancient societies have a story of a world ending snake (Quetzalcoatl, the serpent from the Bible, etc.) and a comet would look like a "sky snake." So these flood/snake stories could be about a comet breakup that may have caused a global cataclysmic at the end of the Younger Dryas period.

So there may have been a civilization of humans, that was at least at the stone age, or maybe even the metal age or beyond, that's now completely wiped out with very little trace of its existence.