National Geographic
January 28, 2025 at 06:39 PM
In 2011, marine biologist Christine Pergent-Martini was hunkered down inside a small research vessel, mapping the Mediterranean seafloor off the coast of Corsica. Then, something truly bizarre scrolled into view: a perfect circle, then another, and another. They were all about the same size—around 67 feet in diameter—with a distinct outline and striking symmetry. Learn more about these mysterious rings, their origins, and the unusual species discovered hiding among them: https://on.natgeo.com/4geX6S5
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