It’s the story of the eruption of the volcano Thera (now called Santorini) in 1650BC.
Archaeologists in recent decades have uncovered the remains of an ancient settlement there belonging to the then remarkably advanced Minoan civilization.
Among the ruins they found a map. It shows a palace on an island in the middle of volcanic caldera (a large volcanic crater).
The fallout of the eruption, and its subsequent tsunamis, are believed to have triggered the collapse of the entire civilization as it engulfed much of northern Crete.
Into the ruins marched tribes of Greeks - the predecessors of the great nations of Sparta, Corinth and Athens.
So the idea that the disaster that destroyed the Minoans may have somehow wound its way through the centuries down to Plato certainly seems enticing. Though unsubstantiated.