May 20, 2014
Like Croatia states:
During last year’s routine underwater mapping, 28 perfect round shapes were discovered in the underwater vicinity of Dugi Otok Island. Each of them has 50 meters in length, and the circles are 300 meters away from each other. They consist of unexpectedly rough terrain, devoid of any floral life, as if some Godzilla-like being walked the Adriatic’s bottom, leaving its circular footsteps in the underwater grassland.
“At first we thought it was some sort of photo manipulation, so we dived at one of the locations, and sure enough, the circles were there. They had a perfect edge, as if someone pulled the Posidonia out with a corkscrew.”
Thanks to: http://missiongalacticfreedom.wordpress.com