Claim: Helike was impacted by a natural disaster.
Evidence: Helike -LRB- -LSB- ˈhɛlᵻkiː -RSB- Ἑλίκη , pronounced -LSB- heˈlikɛː -RSB- , modern -LSB- eˈlici -RSB- -RRB- was an ancient Greek city that was submerged by a tsunami in the winter of 373 BC.