Mal Pais Divers The underwater marine life of the east pacific ocean in Costa Rica counts more than 650 different kind of fish. About 300 of them inhabit the rock formations close to the shores. And scuba diving and snorkeling in the Mal Pais Bay offers more than reef fish: within a few nautical miles from the shore the sea bottom drops to over 1000 m depth, so that many pelagic fish can be seen as well...