Cave Diving

To dive in public parks, for example those in Bonito, one must be adequately certified by an agency recognized by IBAMA - Instituto Brasileiro de Administração do Meio Ambiente, a federal organ. For cave diving in Mariana a cave diver certification will be required.
Sardinia Italy
In the north west of Sardinia, close to Porto Conte bay, Alghero territory, there is the most important cave diving site in the Mediterranean Sea. Thanks to the huge limestone cliffs of Capo Caccia and Punta Giglio there are more than 300 caves above and below water, with about 30 large, and many smaller, underwater sea caves. The Nereo Cave is the most important and it is considered also the largest in the Mediterranean Sea. On the east side of Sardinia there are many underwater cave systems starting from the Gennargentu Mountains, with underwater rivers which arrive at the sea by different, lengthy routes. Here one of the deepest fresh water caves exits at more than 110 m (360 ft) depth.