Open in the rock, it is 5 meters wide, this real natural siphon begins at 10 meters deep and then emerges in a larger chamber on the 30 meters area, with an exit that gives on a rocky bottom populated by murène, groupers and polyps of considerable size, it is not uncommon to meet lobsters peeking out from their lair. A little further on the left is a small cave where thousands of caveman shrimps take refuge during the day.