The name of the site is inspired by a recess that is located in the emerged rock face. Under the buoy there are about 18 meters of water.
At about 20 meters two large boulders form a spectacular vault, large enough to pass underneath. It is completely covered with yellow madrepores (Leptopsammia pruvoti) and encrusting sponges, among which it is often possible to observe small nudibranchs of many different species.
Continuing the dive you can see on the seabed several specimens of Pinna nobilis.
Numerous boulders scattered almost everywhere offer shelter to many groupers and the possibility of varying the turn every time.