[Chrysaetos]

Have you read Plato's Timaeus, Critias en Republic?
Socrates was concerned with the ideal state. Atlantis, for all we know, could be made up.

Was Plato's cave a real place as well? No, it was an allegory.

It's also possible Atlantis was a combination of this ''ideal state'' and real events (Santorini).
Santorini gets as close as it gets if you're looking for an explanation.

All the other worldwide 'structures' under the sea are either natural, or not well investigated. If Atlantis was elsewhere we should see traces and stories elsewhere about it.

All the channelled messages are based on culture that is already familiar with Plato's account. So the one that receives these channelled messages already has beliefs prior to the experience. If Plato never wrote it down, we all would never heard the name Atlantis. Makes sense to me at least.

Lemuria is supposed to have been a continent, which is geologically impossible. Unless of course it was some place many millions of years ago, which is not supported as humans were not around yet.

Sorry if this may come across as harsh, but I see no point in believing in these old myths (same as El Dorado, Eden). If there were such places on earth, there would be evidence. And also important, we would have many traces and myths elsewhere about it. But there is not, despite some people cleverly using river flood tales (which many tribal people have experienced) as proof of Atlantis or Noach, which is of course preposterous.