Actually incorrect. I dont claim to know the true origin of the story, but Plato got it from the egyptians. Then him and a bunch of others spread it. There is most likely basis to the legend (although like any legend, heavily exaggerated) and there are events during the time period matching such a disaster. And people with heavy imaginations, as used to be in that time matched the disaster to their beliefs. For example, Cousteau thought the minoic stuff fit the bill.