It was February 2018 when I decided to venture alone to the High Risk cave system, a poorly documented karst complex in the Sierra Norte of Puebla. I had been exploring caves for three years, but this would be my first completely solo expedition in an unexplored system.
Access to the main cave required a 45-meter rappel through a perfectly circular doline. As I descended in the dawn twilight, the air humidity indicated there was an active water system below. The sound of water intensified with each meter.
Upon reaching the bottom, I found myself in a room about 30 meters in diameter with ceilings that disappeared into darkness. Three galleries opened like hungry mouths. I chose the one with the strongest air current, a sign that it connected to the outside.
The main gallery descended gradually for almost 200 meters. The formations were spectacular: several-meter stalactites, perfect columns, and calcite curtains that shone like silk under my lamp light. I documented each formation with photographs and precise measurements.
But the real challenge began when I reached a sump. The passage completely submerged under a lake of crystal-clear underground waters. Without diving equipment, I had to make a difficult decision. I decided to try a passage through a lateral conduit that seemed to continue beyond the water.
That conduit led me to the most beautiful part of the system: a cathedral room 60 meters high with a perfect mirror lake. The silence was absolute, broken only by the constant dripping that had sculpted this natural temple for thousands of years.
I returned after 8 hours underground, but I knew I had barely scratched the surface of this system. Three months later, I returned with a complete team and diving equipment. What we found beyond the sump redefined my understanding of speleology: a gallery system of more than 3 kilometers connecting with other entrances several kilometers away.
That first solo exploration taught me that speleology is not just about conquering dark spaces, but about reading the signs the cave gives you and respecting its limits. Every drop of water, every air current, every formation has a story to tell if you know how to listen.