I'm of the opinion that there is more to ancient histroy than we know.
This is the general location of what Edgar Cayce said was the continent of Atlantis ... Cayce was a "psychic", but he nailed an amazing number of things in the teens, 20's and 30's ... He also nailed the structures off the coast of Bimini including the year they were discovered.
I've read most of Cayce's "readings". I don't recall the specific nails you refer to, but I do recall:
Cayce predicted that Atlantis would "rise" and to "expect it in 1968 and 1969". [See 958-3, Par. R5.]
As for the location, Cayce placed Atlantis; "between the Gulf of Mexico on the one hand - and the Mediterranean upon the other... the Pyrenees and Morocco on the one hand, British Honduras, Yucatan and America upon the other ... The British West Indies or the Bahamas ... Bimini and in the Gulf Stream through this vicinity..." [See 364-3, Par. R2]
Imho, that covers quite a chunk of territory, hardly a "nail".
USA Today Published Nov. 27, 2000
The road to Atlantis?...The Bimini Road part of the debate dates back to the 1930s, when Cayce went into a hypnotic trance and predicted evidence would be found near the island in the 1960s.
As the date neared, so did the searches for Atlantis, and several private pilots reported seeing what appeared to be a man-made anomaly in the waters off Bimini.
In the 1970s, David Zink, an amateur geologist who was formerly an English professor at the U.S. Air Force Academy, took samples of the stones to a Houston psychic, who concluded they were part of fallen pillars from a sacred temple built around 28,000 B.C. The temple was built primarily by Atlanteans, Zink concluded, and their subcontractors were aliens from the star cluster Pleiades.
More scientific expeditions have been conducted in the area with inconclusive results. Skeptics say the Bimini Road is a natural formation of native beachrock and, indeed, seemingly similar formations can be found along the shorelines of North and South Bimini.
Others have suggested the rocks are ballast dumped from sailing ships...