In 2011, Maritime biologists made a baffling discovery—more than 1,300 just about perfect circles scattered across the Mediterranean Sea ground off the Coastline of Corsica. These formations, some sixty seven feet vast, sparked plenty of theories: had been they volcanic craters, WWII bomb scars, or a thing even stranger? https://medium.com/@perfectseoservice2017/the-thriller-of-one-three-hundred-best-circles-on-the-mediterranean-seafloor-science-unveils-the-f6327a72d07b