The flooded Diros Caves are found on the Mani Peninsula in Greece’s southern Peloponnese, 11km south of Areopoli. You’ll find their entrance on the beach and fishermen will take you through the underground caverns in their boats. There are more than 2,500 waterways and the caverns extend 15km into the rocks!
By the torchlight, you’ll see hundreds of jagged stalactites reflected in the clear water lit by fishermen’s torches. The caves have not been completely explored, but it is known that they date back to Neolithic times.