Atlantis the Antediluvian World

At the center of Donnelly's thesis are a set of similarities between widely separated cultures. This he interpreted as evidence that all civilization diffused outward from a central point (a now sunken continent in the mid-Atlantic). He cites mythological, linguistic, ethnographic and other evidence for this theory, which at the time seemed to add up to an airtight case. Donnelly proposes a literal interpretation of Plato's account of Atlantis. He also ties Atlantis into the global flood myth-complex. These, until recently, have been two of the most compelling unsolved puzzles of history. What was Plato writing about when he described the prehistoric civilization of Atlantis, which disappeared overnight in a great catastrophe? Was this an actual historical account, or a philosophical fable? And why do widely separated cultures on every continent, Australia, the Americas, Europe and Asia all have a similar myth of a great flood from which only a few humans survived to restart civilization?