What was thought to be an underwater, lost city is actually a naturally occurring geological phenomenon.
Pipe-like, disc and doughnut-shaped structures discovered by underwater divers near the island of Zakynthos, Greece, were originally believed to be ruins of an ancient city, such as remnants of paved floors, courtyards and columns.
Now researchers have found that the "ruins" are in fact geological formations, the results of a natural phenomenon that took place in the Pliocene epoch, up to 5 million years ago.

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