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.

They say that northern coastal regions should be included among the Greek regions prone to tsunamis.