The entrance to a horizontal mine shaft, which we could ride our mountain bikes into, was music to our eyes. The stone opening to the Porfirio Diaz Tunnel sat solemnly and quietly on a hillside in the middle of a barrio in Batopilas, Mexico. Sure, it’d been abandoned for 70 or 80 years. But that was of no consequence to us at the current time. The entrance was circular and about 12 feet in diameter, larger than we’d envisioned. A flat dirt surface/pathway —perfect for mountain bikes —led into the darkness. Even though the place had the ominous appearance of being almost eaten by the solid rock, its persistent beckoning won us over.
I was part of a group of four the first time I ventured in. We were down in the Batopilas/Copper Canyon area, guiding a group on a mountain biking adventure, when the mine-riding event occurred. The mine team included one of our Outpost Wilderness Adventure guides, Drew, me, and a couple, Chris and Sara, both experienced adventurers, and serving as volunteer guides for the trip. Each of us was skilled at mountain biking, but, more importantly, everyone was game for such an adventure. Note: I’ve realized that being game for such things and being willing to venture toward the unknown often play a significant role in compelling adventures.
The four of us had been out riding with our group earlier that day. That evening, while having supper at a local cafe, and before the beer-drinking even started, the topic of the mine came up, and we decided riding into it that night would be cool. I’m not entirely sure how the idea arose or how the plan developed. It was likely a speculative theory that often comes up in discussions of various adventures. While most of those make for intriguing conversation but never become reality, a few do- and this was one of those.
I’d heard tales about the old mine for years, although I had never seen any part of it. But earlier that day, we happened upon the entrance and, like kids finding an Easter Egg, became enamored of what we saw. Locally, it’s known simply as “la mina.” Bits and pieces of history and legend say its various shafts were last owned and operated by the US industrialist-owned Batopilas Mining Company toward the end of the 19th century. And that the mine tunnels weave beneath the local canyons and arroyos for great distances. For us, the possibilities of what couldn’t be seen were endless.
It’s a fact that none of us had any experience riding into abandoned Mexican mines. And it’s also true that the mine last operated in the 1920s. But we didn’t let either get in the way of our decision-making or planning. After deciding to go in, we all returned to our hotel rooms and prepared for the night’s excursion. Once it became a reality, I began to question the idea. But as I hovered over a pile of personal mine-riding gear, I suddenly realized that perhaps a stash of forgotten treasure had been left inside. That, coupled with fuzzy visions of scenes from the old Journey to the Center of the Earth and Mummy movies, dominated the part of the brain where common sense and pragmatism should’ve been. And it provided me with reasons for going in, other than “that sounds fun.” I had to see what was in there and had an enthusiastic group of friends to egg me on. And so, one thing led to another, my apprehensions disappeared, and the whole thing gained unstoppable momentum.
As I prepared, I repeatedly went through my extensive personal gear checklist: “bike, headlamp, helmet, gloves, daypack with stuff inside, headlamp, helmet, daypack with stuff inside, bike, and gloves.” The lists of my companions were similar, and apparently, we each made the conscious decision to forego specialized repair materials or tunnel exploration equipment, as we took none. We were all into the concept of light and fast travel, probably because we’d read about it somewhere. And in this case, it jived with our desire to get going sooner rather than later. If there’d been an equipment malfunction once we got inside, we would’ve had to deal with it with whatever we had on hand, and that wasn’t much.
Back in those days (the early ’90s), the mine entrance was unobstructed and unregulated. The mine shaft had a nice, hard-packed dirt surface and plenty of headroom. And to top it all off, from what we’d heard, there were miles of tunnels that could lead anywhere, and, according to some of the locals, were full of untold riches. I remember thinking at the time how lucky we were to have the situation present itself as it did. There were no guards, no locked gate, and no one to tell us not to do it. And we had plenty of time, bikes in reasonably good condition, and an eager, gung-ho group. At the time of the ride, it almost seemed too good to be true. I kept thinking about how fortuitous it was to have things align as they had.
We weren’t oblivious to the possibility of there being poisonous gas. However, I don’t think we ever considered it a real possibility. As much as anything, we were probably just plain old lucky to get away with it all, and I take solace in the fact that at least we were wearing helmets.
The entrance was in the middle of a neighborhood of sorts. With daylight dwindling, we maneuvered our bodies and bikes along passageways, through gates, and around houses. Finally, we arrived at the concrete-and-rock entrance just before dark.
Suddenly, we were there, straddling our bikes and ready to go in. We were on the same ground that some 80 years before had been the setting for all kinds of drama that didn’t involve bicycles. Back then, that place dominated the lives of hundreds, both in good and bad ways. And now, we were at the main entrance to that same underground maze of silver mining tunnels and thinking of it as just a big hole in the rock, mixed into a barrio in a remote corner of rural Mexico, where we could ride our bicycles.
After a few final moments of contemplation and preparation, we moved forward. In the world outside the tunnel, it was nearly dark. And we soon saw that inside, it was even more so. Progress was tentative initially, as we dodged “human bullets” on the ground and got our bearings. We focused our headlamps on the dirt-riding surface from the very start. While there were plenty of unknowns and questions, it was first things first, and we were initially concerned most about the ground surface. What we were riding on was critical, and we were relieved to note that for as far as we could see, it was flat and hard-packed with only a scattering of fist-sized rocks strewn about. We soon determined the riding surface was suitable and, for some unknown reason, assumed the entire mine would be like that as well. So, the fundamental riding part was settled.
While we didn’t have actual bike lights, we did have headlamps. At first, we shone them down onto the ground and out in front, but within a few moments, we were shining them at other places, including the walls, up at the ceiling, and into the distance ahead. As for myself, once I’d determined that the riding surface was good, my immediate curiosity was regarding the shaft ceiling. I was relieved to see it looked solid and stable. For as far as the lights would shine, all we saw was dull and dusty rock, the single tunnel we were in, and the dirt floor. I continued to hope that some treasure—perhaps old tools, Spanish armor, or a bag of coins—would be sitting in the middle of the main tunnel. My first moments of disappointment in that regard were relieved when I realized we hadn’t come to the treasure, probably because we hadn’t gone far enough in.
Our initial movements were tentative, but the pace gradually increased as we became more comfortable with our new world. From what we could tell, the shaft was in good shape, and there was little inside to give us pause. There were no disconcerting cracks or rotting timbers, or at least any that we could see. So, we just kept going further in and with growing confidence. As far as we were concerned, there was just solid rock with a big hole cut through it, a great riding surface, and miles of forgotten tunnels filled with treasure. The more we rode, the more excited we got. Moab, be damned, I remember thinking, we have “the mine.”
From the beginning of the ride, there was no discussion about how far we would go. I guess everyone figured we’d keep going until we stopped and turned around, but it was never clear when that would be. I think we all assumed the moment’s circumstances would dictate the stopping point, and that the turning around part would happen when it happened.
Our pace continued accelerating, and after only a few hundred yards of riding, we were moving at what we assumed was average mine mountain biking speed. We rode in a single file, partly because that’s how we always rode and partly because the mine shaft’s actual geometry dictated it. Surprisingly, there wasn’t much dust stirred up as we rolled along, and eventually, we reached our maximum cruising speed. That lack of dust was more critical than we realized at the time. We had no idea how hard it would be to see or breathe in a tunnel filled with choking dust. My only thought regarding the whole matter was about poisonous mine dust, and I knew we wanted no part of it.
Everyone intently looked ahead at the trail and into the darkness as we rode. We were careful to keep our focus forward, and not back or to the sides. But after only a few minutes, we could stand it no longer and stopped to look around and see just how dark it was. Curiosity ultimately took control of our senses. We turned off our lights and instantly noticed a small dot of light emanating from the distant entrance. The dwindling evening light outside the mine was still far brighter than the pure darkness we were traveling into. What we didn’t see was profound and definitively defined the word “dark.” As we stood there, straddling our bikes again, the drone of mine riding banter paused as we each pondered it all. The experience was utterly profound.
After a moment or so of silence, we all got antsy to move. And so, we got back up on our bikes and began riding. With each pedal turn, we headed deeper into the black hole. Within moments, we were back up to cruising speed and riding in close formation. Thoughts of getting lost, poisonous gas, cave-ins, and darkness kept creeping into and out of my mind as I rode. But mostly, I kept thinking about how neat the riding was and speculating about which of the others might “blink” first. I remember not even considering the possibility that I might be the blinker, which is quite disconcerting now that I think about it.
As I kept riding, I struggled to recall the protocols for Mexican mine riding. And I also found myself continually working out the details for a potential television mystery show. One where a man thinks he’s leading a group of riders only to stop, look back, and realize he’s all alone.
I stayed optimistic about finding something of significant value as we went deeper and farther. That thought was likely shared by the other three as well. However, no treasure, skeletons, or mining artifacts ever appeared. All we continued to see was the pathway, rock walls, and the ever-present distant darkness, which stayed just beyond our most powerful light.
Eventually, the shaft began gently curving to the right. There were still no intersections or anything that seemed out of the ordinary. There was just the sweeping turn, the rock, and the darkness. As we moved along, there were no choices to make, no decisions to ponder, nowhere to go—but forward. So, we just kept riding.
As the big curve continued, I felt the pace begin to slow. The leg motions were the same, but the speed, energy, or something else differed. Just my perception of the slower pace was enough to dampen my enthusiasm. And where was the bag of coins, the bars of silver, or at least some sort of sword or something, I wondered? We kept moving, but the uneasy feeling grew, and our progress slowed.
My mind wandered wildly. I was losing my focus. “Is it some sort of mine gas?” I wondered. I had the profound feeling that the darkness was somehow getting darker. “How dark is total dark?” I silently speculated. We talked about it as we rode and ultimately concluded we had to see (or not)) for ourselves. And so, we came to a second stop. By that point, we were somehow sure we were almost a mile inside. But that was only a guess—we’d never know. Based on our various other mine mountain bike rides, we were confident that we’d at least gone “pretty far.”
Once we rolled to a stop, each of us put a foot down on the ground. Then, we found the switches to our headlamps, turned them off, and it was instantly dark, really dark. The curve had separated us from the entrance, and there was no visible light. Among other things, our brains were suddenly without a reference point. I looked down at where my hands should’ve been, and they didn’t seem to be there. I heard Drew talking about how dark it was, but I couldn’t even make out his silhouette. I wondered if a person spoke in total darkness and was invisible to the eye, were they actually there? Of course, I knew we were all standing in a group when the lights went off, but I soon started to doubt even that undeniable fact. By this point, the strange new world had begun absorbing us.
And then it happened.
I don’t know who started it—maybe it was a simultaneous motion by the whole group, but I don’t think so. Abruptly and seemingly in one connected motion, we flipped on our lights, turned the bikes toward the entrance, and began riding for the exit. It was borderline pandemonium. Within moments, we were up to tunnel panic cruising speed. We each rode hard, making constant spur-of-the-moment riding decisions. Rocks rushed past, even the hardpack stirred, and dust began filling the tunnel. “Get to the entrance fast,” permeated my thoughts, “but don’t crash.” There was yelling about something I wasn’t sure of, strange groaning, and heavy breathing. A lot was going on as we rushed to get out. It seemed like we were all there riding in a clump, but it was more of a feel or a sense rather than a confirmable fact. Nowadays, I wonder what we would’ve done had one person crashed or someone been unable to keep up. I like to think that one of us would stop and render aid in such a case, but I’ll never know because it didn’t happen.s
As the penlight at the entrance began to grow, the confusion of the exodus intensified as unidentified objects suddenly appeared in the air, seemingly racing us toward the exit. There were tens, maybe even hundreds, of them. And they were darting past overhead and through our ranks, going much faster than we were. They were everywhere and joined our frenzy. Initially, I just felt their presence. But soon, it dawned on me that they were bats. At that point, we didn’t have the luxury of worrying about flying mammals since, for some unknown reason, we had to get out quickly. There wasn’t time to think about them or anything else besides getting to the entrance, so we just rode hard.
For several moments, the confusion continued. But then I realized the yelling, groaning, and heavy breathing had changed to hootin’ and hollerin’. In an instant, we had gone from bolting for the exit in vampire horror to excitedly riding with the bats. We were headed to the entrance as fast and recklessly as before. But now, we were relishing the fact that we were doing it with a bunch of bats and were participating in their daily routine.
Nothing had changed except our perception. Our exit went from fear, confusion, and pain to pure joy and wonder. We rode with the bats as they swooped, darted, and rushed to get out into the night air, where they would hunt and eat their fill before heading back inside the following morning.
The penlight soon became a floodlight. Then, it filled the tunnel as we headed down the homestretch without regard for whatever might be on the ground and burst through the entrance into the night air along with scores of bats. We came to an immediate stop. The flying mammals flew on out and away. Their mass exit continued for a few more moments, but eventually fizzled to a halt. At that point, all was calm. We’d made it back out unscathed, the mine hadn’t collapsed, and no one had even crashed. Dogs barked in the distance, a warm wind howled, and bats hunted. On the little flat spot in front of the entrance to the Porfirio Diaz Tunnel, four people straddled their mountain bikes, telling their own stories about what’d just happened. There was no blood, but there was laughter and chatter as everyone did their best to describe what they’d seen and felt as they rode fast through a Mexican mine in the middle of a cloud of bats.
And that’s where the story should end. But it doesn’t.
Some years later, it happened again. This time, the group was a little larger, with five of us mine-riders, rather than four. As before, we picked our way around fences, through gates, and across yards to reach the entrance. After a few minutes of leading our bikes, we arrived at the same small flat clearing in front of the entrance to the Porfirio Diaz Tunnel. Like before, it was just as sundown gave way to twilight. We intended to be deep inside the mine when the bats came to life and flocked to the exit. Or at least that was the hope. We were each prepared to re-create the bat-riding part from the first trip and anticipated that this time would be even better than before because we planned to go farther. The members of the second group had heard tales from that first trip. And each wanted to be a part of the story. Perfect, I thought. The stars were aligning. And once again, there were adventurous people to egg me on.
This time, we were better prepared for mine-riding, which included having actual bike lights in addition to our headlamps. Except, that is, for our local mine-riding expert, Arturo, who had only a headlamp. Also, as mentioned, there were five of us instead of four this time. An improvement in numbers, I decided, although I’m still not sure what the benefit of that was. Since we planned to go further in, had a better idea of what to expect, and more light, all of us anticipated an even more astounding “riding with the bats.”
Without much hesitation, we entered the tunnel in single file. I led. And since Arturo was the only one in the group without a bike light, he rode in the middle of the pack to take advantage of other people’s lights.
“How did we ever get by last time with just headlamps?” I wondered. The first part of the tunnel was the same as I remembered. Nothing about it had changed. We quickly got up to cruising speed and seemed to be moving faster and smoother this second time around, primarily because of the added light, I speculated. I was excited by the prospect of the bat ride. But almost equally so by the possibility of going further in. I can’t help but wonder about the reasoning we used for determining just how far “going further” would be. In many ways, our turnaround plan for the second trip was similar to the one we used on the first mine-ride. We had no real idea how far we’d gone that first time. And I know that for the second trip, there was no discussion of turnaround time or any set distance measured by a cyclometer that would indicate “further.” So, we just rode, with a vague notion that we’d keep going forward until we stopped and turned around.
Riding in the mine was as I remembered. Gears shifted, chains clacked, and riders moaned, groaned, and laughed as everyone was intent on keeping up while savoring the ride. We pushed the pace, although we could’ve certainly gone faster. “No need to crash here, have a flat, or a mechanical issue,” I kept thinking as I made a concerted effort to ride conservatively.
After the tunnel began bending, I recalled we’d only gone a short distance beyond that same point on the first trip before stopping and bolting for the entrance. But I kept riding this time, so we were then venturing into new territory.
After the bend, the tunnel straightened out for a distance, and we rode up on something new. The “narrowish” hole we were riding through suddenly opened into a big room. A three-foot-tall pile of rock debris sat right in the middle of our path. The room formed a four-way intersection, with side tunnels branching off at right angles. A significant vertical shaft went straight up from above the pile of rocks and dirt— an air shaft, I figured. I probably should’ve been concerned about there being a pile of rocks and dirt to begin with, but once I saw a rideable route over the top, I picked a line and just kept going.
We kept to what seemed to be the central tunnel and quickly regained our speed once past the pile. At about that point, I began hoping, once again, to ride up on some lost treasure or relics. I looked around intently. And I listened hard for the beating of a distant drum or something to indicate we were closing in on a lost civilization. But still, there was only the noise of our bikes and bodies doing their best to keep going. Nonetheless, I continued hoping a bag of gold nuggets, stacks of silver bars, or old guns would be in there somewhere. By this point, I sensed we’d gone “a good way in” and figured it was only a matter of time before we came upon something of value.
We kept moving along and soon passed through another intersection. Like the other, it also had a debris pile and a vertical shaft. And once again, there was a route over the top. This time, I didn’t even hesitate as we rode over it, and we continued along our way.
After the second intersection, there was just more rock and tunnel for a while. And then, we hit it. In an instant, the air went from poor but tolerable to poor, stale, and hot. For a short time, we rode on into the rancid air. Up until then, no one had crashed or dropped dead from poisonous gas, so I determined that luck was on our side, and things could be worse. But since none of us wanted to find out what worse entailed, we stopped right there.
We hadn’t found any gold, mining tools, or Spanish armor. And we’d heard nothing off in the distance that we could attribute to a mysterious forgotten civilization. But we were still mindful that we had the bats. And our disappointments were overwhelmed by the prospect of riding with the bats.
We stopped and turned our bikes around, and as before, everyone was curious to see what the darkness was like. So, with great anticipation, we turned off our lights. During the build-up to the event, I envisioned us arriving at this point, turning off our lights to witness the dark, and executing the exit process in a planned and organized fashion. The plan was to stop, turn around, and point our bikes toward the exit. At that point, we’d switch off our lights to get a sense of the total darkness, esoterically discuss the meaning of “dark.” And then begin the exit in a controlled and orderly manner. “I have experience with this sort of thing,” I reasoned. “And this time I’m going to keep a panic from happening.” Hmm.
We didn’t exactly follow the exit plan. We did turn our bikes back toward the entrance, turned off our lights, and talked for a moment about how dark it was. But then, the plan collapsed. Orderliness and control vanished. Someone or something started the panic, and in an instant, we were all moving and riding as fast as we dared toward the exit.
I could feel and hear the utter commotion as we rode hellbent on getting out. I had no real clue what was happening, but I assumed one of the others knew something I didn’t, so I just did what everyone else was doing.
We did share the same goals as we rode. Everyone’s number one was apparently to move fast. Next was to avoid crashing. And finally, and probably most importantly, to get out. We each also had “riding with the bats” on our minds, for better or worse. And so, we kept scanning above while focusing on the riding surface as much as possible.
Everyone with bike lights had turned them on instantly out of necessity, so our immediate riding area was well-lit. From the start of the panic retreat, we kept the lights focused on the ground while our headlamps scanned the bat flying zone.
In retrospect, we were riding a little faster and more recklessly than we should’ve been. Since Arturo had no bike light, he relied on staying close enough to the rider directly ahead to see the trail’s nuances. Initially, the ride into the mine was enough under control for that to work just fine. But now things were happening more quickly. Everything was moving faster, and he allowed the bike immediately in front of him to get farther ahead than he’d hoped. And that effectively decreased his vision of the riding surface. Then, just as he realized what was happening, our riding mass came to one of the debris piles. Slowing slightly and with all the light I had to work with, I was able to pick a line over it and heard a couple of riders behind me doing the same.
But then, I heard brakes grinding and wheels running into rock, followed by a thud as someone hit the ground. Then I heard groaning, Arturo saying something about the rocks, then telling us he was okay. With all the chaos, I slowed, glanced back, and somehow sensed him running and jumping back onto his bike. So, his words were a definitive confirmation of his okay condition. I was relieved he was moving again and that his fall had not been more severe or time-consuming, but I wasted little time getting back up to maximum speed.
I kept looking for the bats. I was ready and mindful of the whole bat-riding part this time. I knew the creatures were in there somewhere and kept assuming there’d be even more this time around. Somehow, I combined the urgency of the escape with the bat riding and settled into a sort of excited anticipation.
I was almost giddy about what lay in store, but only a few of the winged mammals soared past. I was hoping for more—in fact, there was no doubt in my mind we were about to experience the most astounding “riding with the bats” ever. “So, what’s the issue?” I thought. We weren’t doing much differently this time around. The time of day was even better; we’d gone further in and had better light. And it was about the same time of year as the last time, there were more of us, and we’d made plenty of noise. I wondered what was different, and then recalled that the first time I was riding at the back, while this time I was at the front. Maybe, I thought, the same number of bats were there, but my vantage point was simply different.
I was disappointed about the bats up to this point. But I clung to the idea that I might just be missing something because of my position in the riding group. I was hopeful that maybe everyone else was experiencing something profound that I wasn’t because of their own perspectives. All the while, I kept pushing the pace. We were undoubtedly outriding our lights and abilities. Even though we all knew better, none of us were concerned about crashing enough to consider the possibility of slowing down or riding more carefully. Getting out into the open was our first order of business, and riding with the bats was a close second. Style, control, or caution were not priorities.
We soon came to the second debris pile. This time, we were all ready. I slowed down and picked my way over and through. I made a slight bend around a massive rock, caught a momentary glance of the riders behind, and noted there were four. “Good,” I thought, “Arturo is with us this time.”
It was smooth sailing after we passed the last debris pile, and our speed increased. A mysterious and unseen force seemed to be pushing me from behind to keep going faster. There was a brief, meager attempt at hootin’ and hollerin’, but it didn’t last, and mostly, there were just moans, groans, and bike sounds.
I saw the opening getting bigger and brighter. Suddenly, we burst through the entrance into another star-filled night, and the fresh outside air slapped me in the face.
Each of us turned and looked up and back. There were only a few bats. But we could see that all five of us humans were there. Thank goodness we’d all made it out. I was disappointed about the bats, but only temporarily. There would be other times for bat riding down the road, but we’d only had one chance to get out of the mine unscathed on that day, and that part had been a success.
We paused in silence for a moment to absorb what had happened. And then everyone began telling their own story about the events. After a while, the talk turned to what we’d do next time. I’m sure each of us had our own variety of takeaways. As for me, I learned to value multiple light sources and concluded that turning out the lights in a mine always leads to panic. And I’m still trying to figure out why five in a group is better than four. But beyond that, and perhaps most importantly, I realized that amazing rewards are sometimes found in the darkest of places.
