Zero possibility of any truth. ALL FICTION.
Could there be lost cities? Of course. But NONE of them are Atlantis. Atlantis is fiction. Pure 100% fiction. All the way through.
“Zero possibility”? There could have very well been a place called “Atlantis” and it sunk into the ocean. Except it certainly would not be anything like Plato described, or Edgar Cayce. Those stories I believe are pure fiction. Any civilization that advanced would have left evidence and even survivors from some catastrophe, and they would probably have colonized other places. So, maybe not entirely “ALL FICTION”.