Have you read The Apocalypse of Yajknavalkya? They describe (with lots of annotations and references) a meteor storm scenario around 15000 years ago that led to a massive amount of steam and dust and around 1200 years of extreme cold and then another 1200 years of relative cold, and this all coincides with "the stone age".

There's so much they reference in there it's ridiculous. I was referred to it by Mark Jeftovich, the Bombthrower former shitcoiner EasyDNS now bitcoiner guy, who had one of his other bloggers publish an excerpt from it about the pizzagate and related things.

As for "they" should do anything. The Bulgarian government forbade further excavation in the oldest known continuously occupied human settlement, Plovdiv, formerly known as Phillipopolis. And the most ancient gold artifacts were found in Varna. The whispers I picked up on in my time living in Bulgaria were pretty interesting, as was my intuition about the place. I never saw such a big mountain as Rila, also, it was so big as I rode in a car towards Blagoevgrad I had one of those trippy movie moments where the sheer scale of the mountain was like it smacked me in the face.