Premise: Helike ( [ ˈhɛlᵻkiː ] Ἑλίκη , pronounced [ heˈlikɛː ] , modern [ eˈlici ] ) was an ancient Greek city that was submerged by a tsunami in the winter of 373 BC .
Hypothesis: Helike was submerged by a tsunami in 373 BC.
Label: ENTAILMENT