Ustica Secret Cave, among the many caves is little known even by the Usticesi, who gave it the name of the site where it opens, Murazzu (derogatory of the wall). Name adopted by the first settlers for that short stretch of cliff, the Spalmatore, which rises steeply above the sea, just like a wall. The coast forms a characteristic acute angle at the first curve going from the Old Tower towards Sidoti Cove and in the contiguity of the Cove under the Tower which is wedged in the southern corner of the Ustica Island Protected Marine Area where bathing is allowed. Enhanced and protected by the Marine Reserve, it was definitively called Secret Cave or Rosata Cave. The name Rosata derives from the abundant and spectacular cover of an encrusting calcareous alga that gives this color to its terminal section. The cave has three entrances: two from the ground, one from the sea. The first, on the top of the Murazzu, is a depression about a couple of meters deep, easy to access, for the most part dug by the sea which leads into a slightly sloping lava tube, about thirty meters long; the second from the edge of the cliff; the third entrance is underwater, from 0.60 m to 5.5 m deep, but it is not possible to enter as there is a ban on bathing, outside and inside, as the Secret Cave is in full zone A of integral reserve. The formation of the cave is undoubtedly subaerial and only later was it submerged by the sea. The Secret Cave is not easy to identify, let yourself be guided by a guide, or go looking on the cliff, if you find it you will witness an exceptional show.