10 Ancient Mysterious Underwater Cities

Many snorkelers and divers have already explored the ruins of the ancient city of Olous. It is believed to once have been on the northeastern end of Crete. It was reportedly home to between 30,000 and 40,000 people.
One ancient outer wall remains above water level. In fact, floors, murals, and coins have also been discovered there. The research team thinks that an extremely powerful earthquake may have caused the city to drop beneath the waves.
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