With the multitude of perpendicular cliffs and submerged caves, Sardinia makes for atonishing cave dives. The big caves of Nereo and Falco are the most famous, and most frequented, mainly due to the fact that the areas are so large it could take three dives to see all of Nereo. Even more spectacular are the caves of Portico, Belvedere and Cerianthus in the area of the holed island, Foradadda, famous for its enormous cave passages. The caves of Tunnel and Sifone are in the Sommergibile, or "Submarine" area, a 35meter deep rock projection gaining its name for its resemblance to a sunken submarine. The coral cling to the cave rooves and canyon walls of this area, and one can find the typical mediterranean marine life: barracudas, breams, groupers, octopi, tuna, scorpion fish, parrotfish, etc.