The accident occurred on the second day of our expedition to the Hoyos de Río Grande system in Oaxaca. We were a team of six experienced speleologists exploring a new branch of the system at -180 meters depth when Carlos slipped on an internal waterfall and fractured his ankle.
We were in the most complicated technical zone of the cave: consecutive pits that required advanced rope techniques for descent and ascent. With Carlos immobilized, we had to improvise a rescue that would normally require specialized surface teams.
The first step was to stabilize Carlos and make a complete medical assessment with our basic first aid equipment. His ankle was clearly fractured, but there were no signs of internal trauma. The real problem was getting him out of a 40-meter pit with multiple ledges and restrictions.
While Elena and Miguel stayed with Carlos providing care and body heat, the rest of the team began preparing the rescue system. We used our dynamic and static ropes to create a pulley system that would allow us to raise Carlos in a controlled manner.
The operation took 14 hours. Each pit required a complex assembly of anchors and deviation systems to prevent Carlos from hitting the rock walls. In the main 40-meter pit, we had to create three intermediate deviation points and use a human counterweight system.
The most critical part was maintaining constant communication. With Carlos sedated with the painkillers we carried, we depended completely on team coordination. Each maneuver required verbal confirmation before execution.
In the most technical pit, at -120 meters, Carlos got caught on a ledge. Miguel had to descend in parallel to free him while the rest of us maintained system tension. They were the longest 45 minutes of my speleological life.
Finally, after almost 15 hours, we emerged to the surface. The rescue helicopter was waiting for us - we had managed to communicate with surface using a satellite phone from an intermediate room.
Carlos recovered completely after three months. That experience changed my perspective on speleology. I learned that the most important equipment you can take to a cave is not technical, but human. Trust, communication, and teamwork are the tools that really save your life underground.
Now, every expedition includes specific rescue training and detailed emergency protocols. Because in the depths, we are all we have.