Tell me abouthe the myth Atlanta?

A LONG time ago the philosopher Plato wanted to express his views about the ideal society. Now he didn't want to be a bore about it so he made up an interesting story about an island kingdom called atlantus. It was the first Utopian story a thousand years or so before the term was invented. To give his story a dramatic ending he had the whole island utterly and throughly destroyed by a tsunamie, buried beneath the sea. His rendition was so heart-rending that people have been using Atlantus as colourful additions to their own stories. The undersea kingdom of the mer-maids and such rot.