Hi Ellsters.
I read an interesting book about Atlantis several years ago. Can't remember the title but the premise was Atlantis was a large mid-Atlantic continent that bordered all the way from the Azores to Bermuda and the Carribean islands. Not woo woo but highly advanced mainly agricultural civilization. It did perish/sink overnight. Caused by an earthquake or volcano? Can't remember.
The remains are the the mid-Atlantic ridge and islands mentioned above. The Mayans, Egyptians and Basque are the direct descendants. Also the intriguing theory that the destruction of Atlantis allowed the shifting of ocean currents which allowed the Gulf Stream to end the Ice Age