Submerged world of Conca dei Marini is all collected around Smeraldo Grotto, a partially submerged cavity famous for its internal water colour and it is open to tourists thanks to rafts which go around the inner basin. Inside the grotto, where it is not possible to do dives, it is visible a submerged crib located in the deepest point of the cavity and that every year is visited on Christmas time.

The external natural environment of the cavity has interesting geological and naturalistic elements, also because the area is protected against strong currents thanks to the typical conformation of the bay. In ancient times the bay of Conca was famous for red Mediterranean coral fishing, whose manufacturing occurred in loco for the production of “paternoster”, the forefathers of rosary beads.