While mapping the Mediterranean seafloor in 2011, Nat Geo Explorer Laurent Ballesta and his team discovered over 1,300 perfectly formed rings etched into the ocean floor. Equally astonishing was the abundance of marine life nearby, including underwater caves, soft corals, squat lobsters, and more colorful creatures. Learn more about this underwater world and Ballesta's work studying these mysterious rings at the 🔗 in bio.