Cota Cero Buceo is a PADI Resort and dive center in Las Grutas, Rio Negro, Patagonia, Argentina, founded in 1996. It offers Discover Scuba experiences, open water and advanced courses, and specialty training under PADI, SSI and ACUC systems. The center runs boat dives to natural reefs around Las Grutas (Isla Mejillon, El Buque, El Sotano, La Escondida, La Salvadora and others) with sightings of salmon, groupers, sea lions, dolphins and, seasonally, southern right whales and orcas. Its fleet includes several dive boats for excursions along the San Matias Gulf coast.