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Yes, I remember Plato's description of the concentric waterways, though it has been a long time since I read this. And I remember his description of how thick with mud the ocean was after the final sinking, so thick that the exit from the Mediterranean into the Atlantic was impenetrable, for years as I recall. And he was clear that Atlantis was the direct precursor of Egyptian civilization, which certainly seems unlikely to have burst forth in full flower 3,000 years B.C. with no period of ascendancy. And he referenced a source for all his claims, gave the names and the line of communication. And he said, as I recall, that much of Greek mythology, including that about the Titans, was in fact Atlantean history. But what could have been the purpose of the concentric waterways? I'm thinking... ...

"so thick that the exit from the Mediterranean into the Atlantic "

Ah ha! Nothing was said about the mud being in either the Mediterranean or the Atlantic, only that the waterways were impassable from the mud.. Also, I believe that Solon was told by the Egyptian high priests that this all occurred 9,000 years before their time.