“The facts point to at least one advanced civilization existing up to the Younger Dryas (sic) No need to go diving in Cuba necessarily.”
Yes but... If this by a long shot turns out to be true, it would have to be hundreds of thousands of years old. That is a pretty significant difference...
For the last million years, the earth has been cooling a long time with perhaps 20,000 warmer years in roughly 130,000 year cycles. I wonder how many times in that million year hominids/humans have made significant advances in development, only to have them destroyed or forgotten or hidden under water when the probable disaster that initiated the next cold cycle began? I wonder how long before we have before the next start of the long, long cold cycle?
Looking at charts of the up and down temperatures over the past million years, you can see a significant drop at about 74,000 years in our cycle. That is the time when the south Asian volcano Toba erupted leaving a crater around 16 by 65 miles in size. In contrast the recent large eruption of Pinatubo left a crater 3 miles in diameter. Other rather large craters (at least 10 miles in diameter) have been left in places like Japan and Italy in relatively recent prehistoric times. These were prior to Firestone et al’s strongly argued boloid strike(s) in North America which started the thousand year+ Younger Dryas cooling around 13k years ago. That initial event may also have left flash frozen mammoths in Siberia with buttercups in their stomach content.
I met an archaeologist/anthropolist(?) who had moved from California to the east coast around 40 years ago. She said she and some colleagues had found human remains in CA which were at least 100k old, and were facing nastiness from their conventional minded colleagues. This was when Clovis first was still the accepted view. She came east in frustration. So, I think there are still many interesting long shots to be found, and now more people are looking—death to Clovis first. ;-)