Helike was affected by a tsunami.
Helike ( [ ˈhɛlᵻkiː ] Ἑλίκη , pronounced [ heˈlikɛː ] , modern [ eˈlici ] ) was an ancient Greek city that was submerged by a tsunami in the winter of 373 BC . Modern research attributes the catastrophe to an earthquake and accompanying tsunami which destroyed and submerged the city .