In the summer of 2011 a circular object was found on the bottom of the Baltic sea. The circle is 60 meters in diameter, on the seafloor behind it is something resembling drag-marks about 300 meters long, it lies on a depth of 85 meters. It also has a hole almost in the middle of it about 1,5 - 2 decimeters wide.
In summer 2012 the team that made the find, dove down and tried to salvage the "circle" but this was unsuccessful due to weather.
http://www.dykarna.nu/storys/images/1344_large.jpg - picture taken from the boats sonar.
http://instruktoren.se/wp-content/uploads/2012/06/sonarbilden.jpeg - also a sonar picture
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