Graham Hancock made a case for Atlantis being on coastal Antarctica. I do find it interesting that a National Geographic expedition identified long, artificial roads and pyramidal structures ("artificial" was their description of the images they captured) under 1/2 mile of water, off the coast of Cuba.

Either they were wrong, or those structures were 1/2 mile higher during human history. The latter would imply cataclysmic geological shifts, for which Hancock's Netflix special Ancient Apocalypse and a Phys.org paper both make a case, circa 10,800 BC.