The uncontaminated navy reserve of "Isola dei Ciclopi” offers splendid depths for the underwater immersions.
There are many centres of immersion that manage this activity from years, allowing also to the amateurs to admire Acitrezza's marine beauties.
We can find lava depths until to approximately 30 metres, then are sandy and, beyond 50/60 metres mostly become argillaceous, sometimes, there are presences of circular lava blocks. Marine flora and fauna, especially up to 30/35 metres of depth, give the possibilities of numerous underwater routes suitable for the underwater photographies. You can see various kind of green seaweeds like Cystoseria or Sargasso. The grasslands of Posidonia, instead, particularly are situated between Lachea island and the coast. Beyond the 35 metres of depth and until approximately 50/60 metres there are calcareous red and violet seaweeds (Melobesie). Equally interesting is the rich fauna of vertebrated and invertebrated living the depths of Acitrezza. About fishes, we can find groupers, conger eel and moray nest inside the gorges or admiring lots of young  “monacelle” that will become brown. Other species most common are: anchovy and various fish of depth living in green seaweeds and posidonie like serrani, girelle, labridi, sargos, ope, salpas and many others. Among the most important crustaceans are common the hermit crab, the crab and more depthly, in front of the “Lachea”, the lobsters. It is an enjoyness for the photographers superficial walls colonized to hundred of yellow or rose corals or small grassland of fluctuating white “idrozoi” by the undulatory movements. In the small channels of the Cyclopean rocks there are yellow and red “gorgonie”, sponges and colonies of red “briozoi” of Miryozoum (false coral) and the most delicate rose “trine” of the Retepore islands. The depths of Acitrezza are famous for their molluscs: from delicious and appreciated “occhi di bue” (Haliotis), to imposing Fins, to the rare and precious for the collectors shells of “Mitra zonata” and “Coralliophila sofiae”.