Cave diving is a type of technical diving in which specialized SCUBA equipment is used to enable the exploration of natural or artificial caves which are at least partially filled with water. It is an extension of the more common sport of caving, but is much more rarely practised because of the skills and equipment required, and because of the high potential risks.
In Brazil there is cavern diving in Chapada da Diamantina, in Bahia state; Bonito, in Mato Grosso do Sul state; and Mariana, where there is also cave diving (visiting Mina da Passagem), in Minas Gerais state.
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.
Source: Submundo Dive