In the heart of the Mediterranean Sea, off the coast of Cap Corse, a group of scientists makes a surprising discovery: over a thousand perfectly round rings etched into the sandy seafloor, more than 100 meters deep. What are they? Who or what created them?

To find out, diver and naturalist Laurent Ballesta leads an extraordinary scientific expedition. Using cutting-edge technology, he and his team live and work underwater for three weeks, exploring an unknown and fascinating environment. This documentary follows three years of research, stunning imagery, and unexpected discoveries that reveal a unique ecosystem and help us better understand our planet’s past. An exciting journey into the hidden secrets of the Mediterranean.

Wow, great film. Finally thankfull to my french teacher.