I saw that. Very interesting.
I think this is a very good summary of the problems with ever documenting this:
The difficulty is that nearly all of the land that might contain traces of human settlement or activity -- the critical proof for archaeologists -- is now under water.
Not just under water, Under lots of very cold, very deep, very murky, water.
Here in Northern California, you can have a couple hundred feet of water under your hull, and only be a quarter mile offshore.
Farther north, water temps are so cold they require special diving gear.
The water visibility is not good anywhere in the these latitudes.
It would be a lot easier if we were looking in the warm, shallow, clear waters of the Caribbean