The ocean levels rose 400 feet in an instant....Plato puts the destruction of Atlantis at 11,700 years ago....The sphinx water erosion is at minimum, 9,000 years old but Boston University Robert Schloch believes it's a minimum of 15,000 years old....Most of these civilizations are underwater.....
I could be sold on a meteor as the cause for the Younger Dryas but on human civilizations prior to and during the last ice age, I am not (yet).