Underwater city was built by microbes, not people

The structures in Greek waters reveal geologic rather than archaeological past

MICROBE MADE  Odd underwater formations near the Greek island of Zakynthos are the millions-of-years-old remains of natural hydrocarbon vents, not a lost Greek city.

University of Athens

When snorkelers discovered what appeared to be ancient stonework off the coast of the Greek island of Zakynthos in 2013, archaeologists sent to the site thought the odd rocks might be the ruins of an ancient city.