German geologists believe a tsunami recorded by the ancient historian Herodotus did indeed protect a Greek village from Persian invaders.
They say they have found evidence in northern Greece that the event in 479 saved the village of Potidaea.
Herodotus recorded that huge waves had killed hundreds of Persian soldiers during the siege of the village.
The scientists from Aachen University warn the area may experience another massive marine event.
Subscribe to The Iranian newsletter
Sign up for our daily newsletter to get the top news stories delivered to your inbox.