About 150 species of fish have been found in Saba's waters. A main draw for divers are the pinnacle dive sites, where magma pushed through the sea floor to create underwater towers of volcanic rock that start at about down and rise to about beneath the surface. The waters around Saba were designated as the Saba National Marine Park in 1987, and are subject to government regulation to preserve the coral reefs and other marine life. The Saba Conservation Foundation has operated a hyperbaric chamber in case of diving emergencies, since 1991.