Atlantis is a made up place that Plato used as an allegory for arrogant nations. People who mistake older ancient and renaissance era writings as historical are either mistaken or engaging in pseudoscience. Even if there was some weird now submerged piece of land around 9000 years ago, that wouldn't imply the people writing about it would have even been referring to that. It's just a fun story that later writers picked up on.
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