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cave diving training Alessandro Reato

“Il Filo di Arianna” is located in Chemuyil, in the center of Riviera Maya, surrounded by “cenotes” and cave systems, making it the world’s top place for cave diving.

Chemuyil is in the Mexican state of Quintana Roo, on the east coast of Yucatan Peninsula, 40km south of Playa del Carmen and 18km north from Tulum.

To better understand the origins of the unique scenery, we need to know that this vast area of caverns and “cenotes” has a very particular geological history:   the whole Yucatan peninsula, was a submerged limestone platform (corals and marine sediment) that is now up to 2300 meters thick. This platform initially formed in the Cretaceus period (145 - 65 millions of years ago), when over 1300 m of limestone strata were formed, then continued in the Tertiary period (65 - 1,5 millions of years ago) with an additional 1000 meters of carbonate sediment deposited.

The formation of the caves and caverns, of the systems crossing the Yucatan Peninsula, has taken place in the recent Pleistocene, between 600,000 and 10,000 years ago. This depended upon three independent yet complementary mechanisms:

  1. The whole Tulum surrounding area receives approximately 1.5 meter of rain water per year. This absorbs the atmosphere’s carbon dioxide, enabling the formation of carbonic acid. The terrain’s permeable structure makes it practically impossible for river and lakes to form. Water penetrates the terrain and finds its way to the oceans via the fractures in the limestone structure.
  2. The fluctuation of the sea levels occurring during any of the glacial eras, provided the second l3ever of the mechanism. As the water froze at the poles, the sea level in the equatorial area diminished considerably. This in turn drained away the galleries and the highest caves.
  3. As the water drained away, it wasn’t able to sustain the cavern’s structure any longer, and they consequently collapsed. This event opened up the “karst windows” (or the Mexican call them, cenotes) along the cavern systems. During the glacial eras, acid rain continued to infiltrate the limestone, dissolving it and slowly depositing it inside the caverns. This slow, dripping process b uilt the stalactites and stalagmites structures, amazing features of this area that can be easily accessed and viewed today.

About 10,000 years or so ago, at the end of the last glacial era, the sea level raised about 100 meters, submerging again the caverns and caves system. In the deeper passages, we can still find sea water, above which rain water layered. The rain water floats on the surface as it is less dense. And it is this rain water that, as it makes its way to the sea, continues the limestone erosion process.