Atlantis could have been real. When ocean levels were low in the Ice Age, sub-ocean highlands could have emerged as (extended) islands. Perhaps it could have been in the enlarged Azores or enlarged Canary Islands. Or in the Sargasso Sea. Or on the Mid-Atlantic Ridge, as a result of some volcanic activity.

But could there have been early human habitation? Or even a high culture, as reported by Plato? There could have been several waves of unknown ancient civilizations, in ice ages or interglacial periods, whose evidence has been totally erased by catastrophes such as floods. Human populations would have undergone severe bottlenecks or near-extinctions.

That is why so little is known about this possible pre-history. Yet myths and legends may indicate some ancient knowledge that somehow got through. There may have been several Adam-Noah cycles. We are the descendants of the multiple Noahs. Will the cycles be repeated?