A cenote is a natural pit or sinkhole resulting from the collapse of limestone bedrock that exposed groundwater underneath. The Yucatan consists of over 3,000 cenotes that are all connected. They range from cenotes that are caves with very few openings to "The Pit", a clandestine hot spot for scuba divers that is predominantly underground with the exception of a wide opening where you can jump from 25 feet in the air into the cold water. My fantastic guide Nick at Avatar Adventures was extremely knowledgable, not only about the Mayan culture that so heavily protects the Dos Ojos cenote, but also the ecological future of these limestone wonders. As you snorkel through the underground cave, it is a meditative experience where you see the truly stunning power of mother nature.