I totally agree. I wonder what is hidden under the mud of the Missippi delta. The delta would have had a mild, favorable climate during the last ice age and would have been a natural location for a villages and cities. When the last ice age ended 9000 years ago the sea levels rose 300 feet and the Mississippi River would have covered them in sediment.
I imagine, in a Lovecraftian sort of way, a massive ruined city under the sea where the Hudson Canyon drops off to the abyssal plain.