Diving the Cenotes What's it All About
For the certified scuba diver, cenotes offer a truly unique underwater environment. Visit any popular cenote such as Dos Ojos, and you'll find small groups of visitors including North Americans, South Americans, Europeans, etc. Elitists all over the planet haave somehow gotten the word that the next great dive adventure is here and now! Ask any diver about their cenote  experience and they will reply with words like "magnificent," spectacular" and of course "unforgettable." For first-time visitors, whether snorkeling or diving, cenotes are an experience that is unforgettable. 
There are many reasons why this special environment is so attractive. The sum total of these characteristics make this the most appealing cave diving in the world. These included easy access and proximity to many different cave systems; diving conditions not affected by weather; shallow depths of 40 to 60 feet; moderate water temperature of 75 to 77f; barely discernible currents; and huge, non-claustrophobic caverns and passages. However, what really makes this experience so special is awesome  underwater visibility and spectacular cave decorations.  
Groundwater that enters the caves if filtered though limestone. Further filtration occurs as the horizontal flow slowly moves towards the sea, resulting in water so completely sediment free that visibility is a constant 200-feet plus. It is only the sensation of water against your skin that keeps you from believing you are swimming in air. Invisible water is the window through which you view an infinite variety of sensational cave decorations the single most impressive characteristic of the cenote dive experience. A thousands Michelangelos working over the course of human history could not produce anything more beautiful than these nature sculpted caverns. 
After caves are created by dissolution, and while thy are still relatively dry, the process reverses and a reposition of material occurs..  Groundwater trickling into caves caries minuscule amounts of calcium carbonate. With each rainfall, a small mineral coating is left behind. Over a vast period of time, nature's paintbrush produces an endless variety of cave formations known as spelleothems: ablactates, stalagmites, dada straws, columns, flowstone, draperies, bacon strips, rim pools and more. The subsequent flooding of the caves provides the finishing touch. Today, the caverns are a submerged art gallery of mammoth proportions. Intricate designs dazzle your senses with intense feelings of wonder and awe.
Diving the Cenotes How to do it.
Cenote diving is divided into tow distinct forms. One is cavern diving, define as staying in sight of the entrance of a cave within the realm of natural sunlight. The other is cave diving, swimming into a cave beyond the limited of natural light. 
To safely dive the cavern zone, scuba diver must be trained and certified as a cavern diver or participate in a cenote dive with a qualified professional cavern diving guide. Most accessible cenotes have a permanent line installed serving as a reference to a circuitous tours. All necessary equipment for open water diving is required, plus tow battery lights and a line reel.  Special attention and training is give to  monitoring air supply,  buoyancy control, body positioning, emergency procedures and the environment. The cavern tour is the safest and most popular way for open-water divers to experience the splendor of the centos. 
Cave diving in the cenotes is also safe and accessible, providing all requirements are met and followed. However, additional training equipment and techniques are natural prerequisites to diving in overhead environment beyond the reach of sunlight. 
Cavern diving courses involve a minimum of two days instruction and four dives. A full cave-diving course is tough over six days or more with a minimum of 14 cave dive. Specialized training agencies included the National Association of Cave Divers and the Cave Diving Section of National Stereological Society.

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