In 2011, Maritime biologists created a baffling discovery—more than one,three hundred virtually perfect circles scattered over the Mediterranean Sea ground off the coast of Corsica. These formations, some 67 ft wide, sparked plenty of theories: had been they volcanic craters, WWII bomb scars, or a little something even stranger? https://medium.com/@perfectseoservice2017/the-thriller-of-one-three-hundred-best-circles-on-the-mediterranean-seafloor-science-unveils-the-f6327a72d07b