Plato created the myth of Atlantis, an island of the ancient world which he used as an allegory of aggression and superior force. Plato presented his story as a history, wherein the fictional locale was reputed to have a strong navy which threatened the Greek city-states, and was finally defeated by Athens, Plato’s home, due to its superior style of government. At the end of the story, Plato asserts that the island fell out of favor with the gods, and was submerged beneath the seas. Later authors have depicted Atlantis as an ideal utopia, which became obsessed with its advanced technology, which eventually destroys them.
Astrologically, Atlantis represents being overwhelmed or “flooded”, including actual maritime or natural disasters involving water. There can be a sense of warning or impending doom, and it relates to improper use of knowledge or technology, with its attendant risks and negative outcomes.