[blam]

"That's yet another field that deserves more study. 13,000 years ago, at the height of Wisconsinian glaciation, the coastline of western Florida was about 90 miles west of present-day Tampa Bay. I often wonder what's buried under the waves."

I have a theory that the Gulf Of Mexico was blocked off from the world's oceans across Yucatan, Cuba and Florida during the last Ice Age.
The Gulf Of Mexico would have dried up and essentially become a big lake. That's the only explanation I have for the underwater structures off the Cuban coast. They were built there on dry land during the Ice Age and were flooded 7-12,000 years ago when the 'dam' was broken...similar to the Black Sea flood in 5,600BC.
It could be a good site for Atlantis.(?)

[Renfield]

"....I have a theory that the Gulf Of Mexico was blocked off from the world's oceans across Yucatan, Cuba and Florida during the last Ice Age...."

NO, impossible. The maximum drop of sea level during the height of glaciation was about 300 feet, give or take a few yards. There are trenches into the Gulf of Mexico that are more than 10 times that deep. See if you can download some bathymetry charts for the Gulf. It's been open to the Atlantic for at least 65 million years.