Episode of a naturalistic film series shot at the aquarium in Naples. Under the waves, there is an unknown and wonderful world; the intense life of thousands of creatures, so fascinating to study, is in full swing. Here, among the seaweeds, hundreds of shellfish with elegant shells, strange crustaceans, shoals of small silver fish dart and slither in all directions; a little further, a myriad of small crabs or annelids with pretty shapes hide in the sand; colonies of corals form a delicate embroidery among the rocks. And all these creatures live, love and die.