Atlantis is a myth in response to a truth. Plato picked up the Atlantis material himself, psychically.

In his dialogues Timaeus and Critias, the Greek philosopher Plato [427?-347? b.c.] described how the fabled island continent of Atlantis sank beneath the ocean west of the Pillars of Hercules–the Strait of Gibraltar–some 12,000 years previously. Looking backward in time, Plato heard the story of Atlantis from his maternal uncle, Critias the Younger, who was told about it by his father, Critias the Elder, who heard about it through the works of the Athenian statesman and lawgivers, Solon, who had lived two centuries earlier [ 640-559 b.c.); and Solon got the story of Atlantis from Egyptian priests, who got it from—-? Whether Atlantis actually existed in historic terms, its location, the time of its suggested demise, and so forth, are of course points strongly contested by scholars, scientists, and others.