Photos such as this one that show a cobble-like pavement give further credence to the theory that these structures are the remains of an ancient civilization. However, this is not the case.
Professor Julian Andrews explained in a statement, "The site was discovered by snorkelers and first thought to be an ancient city port, lost to the sea. There were what superficially looked like circular column bases and paved floors. But mysteriously no other signs of life ”” such as pottery."
Hmm. Surreal. Yet this looks so much like a man-made road! What happened?
This structure, for example, definitely looks like it's made of cement. Could this cement have formed naturally? Well actually, it sort of did. It's a process known as "concretion." The cement is actually dolemite, which is rare to find underwater but can commonly be found in areas with microbe-rich sediments. But because of the erosion of the water, this hunk of dolemite began to look like something made by humans. Unbelievable.
Isn't the shape of this structure just so neat!? Professor Andrews explained, "We found that the linear distribution of these doughnut-shaped concretions is likely the result of a sub-surface fault which has not fully ruptured the surface of the seabed."
To put it more simply: These structures form this way when gasses ”” mainly methane ”” escape from the ocean floor.
This map shows the site of this scientific wonder off the coast of Greece ””specifically off of Zakynthos's Alikanas Bay. It was discovered by tourists during a dive in 2013 and is between 6 and 16 feet underwater.
In case you were still holding out some hope that the structures were made by humans, their age was measured using geochemical dating techniques, and they were found to be over five million years old ”” much older than the human race.
This underwater city may look like it was built by humans, but, in fact, it was created by a geological phenomenon. The specifically shaped structures were created from the mineralization of hydrocarbon seeps in the sea floor.
So it's not a man-made city. But it is something just as cool! Science created its own underwater city.
8. Although One Theory Has Been Tragically Unexplored