Home page
Caves beneath the dunes?
The summer selection
Descriptions, maps and adventures
Dahls are delicate and dangerous
Whatever's been published and more
Post your announcements, questiona and answers

THE CAVE THAT BECAME A QANAT

2005 by John and Susy Pint  --  Updated September, 2013

 

     We moved to the Guadalajara area of western Mexico in 1985 and the very first cave we explored was located in the low hills above La Venta, the little town closest to our new home. We were standing in the hardware stJohn and Susy Pint measuring the high entrance to the Azoodore looking over hundreds of items hanging from nails on the wall: everything from horse collars to hand-made, galvanized sprinkling cans. While I was absorbed in selecting pipe fittings and the like, my wife Susy stepped out into the street and exclaimed, "John, I can see a big black cave entrance up there." Little did we suspect that what awaited us in those hills was an enigma that would take ten years for cavers, geologists, archeologists and historians to unravel.
We picked up our caving gear and made our way up rolling hills dotted with oaks and pine trees to an impressive entrance seventeen meters high and five wide. To our surprise, the cave walls were not of rock but the hard-packed volcanic ash known as jal, from which the Mexican state of Jalisco gets its name.


     We stepped into a large, single room in whose high ceiling we could see a perfectly round hole about two feet in diameter. Not far from it, we found another very similar hole. When we came upon a third such opening -- perfectly aligned with the other two -- we knew there was definitely something strange about La Cueva de La Venta. The room ended about 70 meters from the entrance in an enormous collapse of loose jal, far too crumbly to climb. Sticking out from under this huge heap, which nearly reached the ceiling, was a pipe, from which water was trickling. Apparently the cave continued beyond the collapse.


SEVENTY-FIVE ENTRANCES


qhole.jpg (110293 bytes) Upon the scene came Henri de St. Pierre, a French geologist with whom we had caved in Arabia. Henri, Susy and I headed up to the mesa above the cave. This was a wide, flat area planted with corn and other crops. Here we located the collapse, which, on the surface appeared to be a hole twelve meters around and filled almost to the top with loose jal. We started to walk away from the collapse and to our amazement, we found a string of small holes, at first perfectly aligned and approximately 11 to 12 meters apart. We immediately began surveying and by the end of the day counted 75 holes forming a gigantic Y on the mesa.


YECH!

     We plumbed one of the holes and found it was about 22 meters deep. A rappel seemed the only way to enter this part of the cave, but we wanted to have some idea of what we might encounter down below: an underground river? a sea of mud?
Henri and his all revealing probe "This," declared Henri, "we will clarify by casting down a probe." We felt honored to participate in such a scientific approach to caving and put together the required materials: a length of 1 inch pipe with holes drilled at one end and a long piece of cord which is tied through the holes. "Attention below!" shouted Henri as he dropped his missile down the shaft. It made neither a clatter nor a splash when it hit bottom, just a solid THUNK, so we watched in silence as Henri drew the pipe back up to the surface. I had my camera ready to capture the historic moment. What would the core sample reveal?
     Henri carefully examined the end of the pipe and suddenly twisted his nose in revulsion. "Merde!" he cried and suddenly there were no volunteers for rappelling.
     One day we returned to the mesa and climbed down a cable ladder to the top of the great jal collapse. A small opening between the cave roof and the dirt pile revealed a long slope heading downward. Here was an easy way to check out the main portion of the cave and a convenient escape route in case we ran into anything disgusting. What we found was, once again, totally unexpected. We were in a long, narrow, fissure-like passageway whose floor was dry and which was anything but repulsive.

GOLDEN COLUMNS

qnarrow.jpg (80788 bytes) The scene before our eyes was extraordinary. Through the curious holes in the high ceiling shone beams of golden sunshine which deposited bright circles of light on the dark floor. Suddenly, one of our friends on the surface disturbed one of the holes and particles of dust floated down the sunbeam, dancing like fairies and creating the illusion of a shimmering white column appearing out of nowhere.

Beam me up Susy In this part of the cave we found broken pieces of old-style water tubes and two rectangular brick structures, all of which led us to believe that this was -- as the local people asserted -- an old system for collecting water and channeling it down to the village below. What we were not prepared to believe was that the cave had been dug by human hand. Instead, it seemed that the local people had taken advantage of a natural fissure where water often collected. To bolster this theory, our friend Henri had theorized that the roof holes could have been caused by the intersection of the long, straight, natural fissure with shock waves from a strong earth tremor, producing weak points where surface water would drip, removing jal from the ceiling, one grain at a time. To us it sounded plausible.

ATTACK FROM THE BLACK

Chris Beekman and old brick structure When two U.S. cavers, Ray and Cindy, visited Guadalajara, we naturally wanted them to take a look at what we were touting as "the world's only 76-entrance cave."
The three of us were on our way back from a visit to the nearby town of Tequila when we decided to stop off at La Venta for a quick look at the cave. Susy wasn't along and, in fact, seems to have a special talent for not joining expeditions where disaster is poised to strike. On this occasion, we had no proper caving gear with us, only one good flashlight plus Ray's feeble throwaway, which was emitting a feeble brown glow. "No hay problema," I exclaimed confidently as we made our way down the dusty dirt pile, "there's plenty of light in this section from all those holes in the ceiling."

Qanat hole seen from below The four-meter wide fissure we were in quickly narrowed to a maximum of 1.5 meters at shoulder level and a mere 30 cm on the floor. Right at a spot where there was no shaft of light coming from above, Ray, who was bringing up the rear, suddenly began yelling bloody murder at the top of his voice. His shouts had such a tone of genuine panic that Cindy and I literally leapt into the air and jumped forward while Ray jumped back.
Up until this moment, we had assumed there were only three of us in that cave, but, from a point halfway between us, we could hear inhuman noises that made our hair stand on end. "John, shine the flashlight over there, down on the ground!" And we had our first look at the creature with which Ray had been doing a tango in the dark.

IT

There in that narrow slot, the bright beam of my light revealed the coils of a two-meter long snake, type unknown. It was obviously enraged, crazily striking left and right and putting on a terrifying show. As Ray so aptly expressed it, "That sucker was hissin' and' spittin' an' jumpin' all at the same time." And with good reason. Apparently, I had woken it up, Cindy had stepped right on it and Ray was left to make the apologies.

BACKS TO THE WALL

Slippery walls make progress difficult in some parts of the qanatHow do you get past an incensed serpent in a narrow crack? Even when we moved further away, we could see it lunging at every shadow. It had a good 75 cm reach and there was no way we were going to slip by it. The possibilities of chimneying up and over it were not too bright, for a little experimenting showed us that one of the side walls was extremely slippery.

While Cindy and I pondered our situation, Ray left the cave to hunt up a long stick. We decided he would used it to hold down the snake's head while we zipped by. Cautiously Ray reached out with the pole... "Keep the light on it, John! Keep the light on it!... Ah! Got him!"
There ensued a wild thrashing of rippling coils. Hoping Ray had the right end pinned down, Cindy scrambled over, feet on one wall, hands on the other. "EEEEEK!" I'm slipping!" It could have been a scene from an Indiana Jones movie. However, Cindy didn't slip and I took a flying leap, which resulted in my going right over the top of Ray, who was squatting on the floor. Of course, as I flew over him, there was no more light on the snake. "Run for it, Ray!" I shouted and believe me, we didn't hang around to find out how fast that snake could move. Apart from not carrying proper lighting, we had also failed to consider that a cave with 75 holes in the ceiling is 75 times more likely to contain extraneous objects than a single-entrance cave.

NASTY WATERS

Feisty snakes are not the only things people like to toss into holes in the ground. At the far end of the ever-narrowing passage we came upon a great heap of trash on the floor. This was very close to a ranch house up above and it seemed the ranchers had decided to use one of those convenient holes as their garbage can. They were also using a second hole as a toilet, but what they had decided to do with a third hole really amazed us. Unbelievable as it may seem, they had run a pipe down this one and through it they were pumping up the very water they had contaminated. A large stone reservoir was their source of water both for irrigation and for drinking.qtrash.jpg (73142 bytes)

For the next few years, we used the better-smelling parts of the cave for training novices in rappeling and chimneying as we watched the level of the floor fluctuate as much as one meter, depending on how much water was flowing and whether or not it was damned up. There seemed to be a battle going on between the ranchers on the mesa and the people in the town and rumor had it that the collapse (which gradually shrank as time went by) had been caused by dynamite. As for the true origins of the cave, we were still in the dark until 1994.

UNNATURALLY ERODED

This was the year that an archeologist named Chris Beekman walked into our house and introduced himself, saying he had been working in the jungles of Guatemala and -- when he mentioned he would be going to Guadalajara -- had been told to drop in on the Pints. How he ever found us, without a phone number or an address, in a city of six million, is a mystery to me, but apparently a trifle for an archeologist. In no time we became friends and enjoyed following Chris through the underbrush of desolate canyons and mesas. "Look at this!" he would shout, eyes aglow. "This was a corral and here are the foundations of a house." I would look as hard as I could at where he was pointing, but somehow, I never saw anything more than a few old rocks.

One day, it occurred to us to take Chris to La Venta Cave. An archeologist, we figured, might just spot something that a caver wouldn't notice.

Chris Beekman walked up to the cave entrance and stopped dead. "Look! Flat-edged pick marks! They go right up the walls to the top. This is a man-made tunnel!" Trying to hold our own, we pointed at the ceiling. "Check that out. It's a hole that only goes partway up and stops. It must have been a drip hole that dried up, proof that erosion..." but Beekman cut us off. "Wait a minute. Take a look at one of your completed holes. If it was 'naturally eroded' what are all those hand and foot holds doing there?"

We didn't have to get very far into the passage before we threw in the towel. Everywhere, our "cave" showed signs of having been carved by human hand, signs that even a non-archeologist couldn't miss (once pointed out).
But the whys and wherefores of this curious underground passage fully came to light when Beekman and I returned to the cavern with Phil Weigand, an archeologist with many years of experience in Mexico.Archeologists Phil Weigand and Chris Beekman in the azood or reservoir

THERE QANAT BE A DOUBT

This is neither a cave nor a mine," declared Weigand. It is a well preserved qanat and it is going to provide a major contribution to our knowledge of such irrigation systems in the New World... in fact, until now, no other qanats were known to exist in western Mexico."
Now, qanat is an Arabic word, which means that the first letter is not like our "qu" but represents a kind of glottal stop you should make as far down your throat as possible. If this makes you feel like you're choking rather than talking, just say "ka-NOT". But what was an Arabian qanat doing in Mexico?
In a paper written for the Mexican Anthropology Society, Weigand explains that a qanat or kariz is a subterranean conduction device for bringing water from one place to another. One end of the gently sloping (about two degrees) tunnel is located beneath the water table, often below the surface of a hill, while the other end reaches a community where water is scarce or not available at all. The string of shafts is dug to provide ventilation, light and easy access for excavating and later maintaining the qanat. Once the system is operating, the holes are sealed with capstones, several of which were soon found alongside the shafts on the mesa overlooking La Venta.John Pint investigates a qanat in western Saudi Arabia still supplying water to a nearby farm
Some historians postulate that qanats have their origin in Armenia, where tunnel digging for mining is extremely ancient. Qanat engineering, however, was brought to perfection in Persia, and modern Iran still has over 160,000 kms of qanats, the longest system containing some 27 kms of tunnels. This technology was spread far and wide through the Middle East and Africa and is thought to have been brought to Mexico by the Spaniards, who may have received the techniques from Morocco. Weigand relates that qanats have been described in several parts of Mexico, including the Tehuacan valley, Tlaxcala and Coahuila.

While living in Saudi Arabia in the late 1990's I learned that qanats were widely used there in the past and that the technology is still greatly appreciated and applied in modern times. Underground aqueducts would appear to be ideal for hot, desert lands where eqfarm.jpg (78895 bytes)vaporation must be kept to a minimum. There is even evidence that a qanat once saved the city of Jeddah from invasion by Portuguese warships in 1516 AD. The Portuguese believed they had cut off Jeddah's water supply and waited in vain for capitulation, little suspecting that a qanat sixteen kilometers long was supplying the town with all the water it needed.

MASTER DIGGER AT WORK

Just how did the qanat builders go about excavating their underground irrigation system? In a paper submitted to Mexico's Collegio de Jalisco, Chris Beekman describes the techniques used by Persian professionals:

The master digger decides where the mother well (a misnomer as this is not actually used as a well) should be dug. This vertical shaft is dug at or near the top of an alluvial fan and is meant to determine the depth of a permanent and reliable deposit of ground water. Once this depth is reached, a calculation can be made as to where the mouth of the channel should be located and, hence, how much land can be irrigated from the projected qanat. If deemed desirable, the excavation of the channel can begin... Shafts between the source and mouth of the system can be started either before or at the same time as the excavation of the tunnel. Armed with picks, shovels, baskets and small lamps, the diggers begin either to link up wells and/or extend the tunnel from the mouth toward the mother well.

qdiagram.jpg (212586 bytes)
As the channel is small, the master digger does most of the actual excavation, aided by a few workers behind him to haul away the spoil to the nearest shaft. On the surface, other workers haul up the spoil from the excavation below, depositing the material in a circle or crescent around the shaft's entrance, which keeps surface water from running into the hole. The shafts are often dug ahead of the channel's course, thus immediately facilitating both access and air flow into the tunnel as it progresses toward the mother well. Shafts are spaced from 15 to 150 meters apart (though always at fairly regular intervals) and are most frequently less than a meter in diameter. The deepest ones are over 100 m.

Luis and Yunuen Rojas surveying Qanat La Venta String alignments and levels are all that most master digger engineers need to keep the channel at the correct angle of incline, the maximum gradient being around 1:1000 to 1:1500 meters, and thus nearly horizontal. Channels are kept as straight as possible to facilitate both the construction and water flow, once the qanat is completed. The tunnels are seldom more than one meter wide and 1.5 meters high and their ceiling is arched to help prevent collapses. Aside from cave-ins and suffocation, the most dangerous moment for the excavator comes when the water table is actually entered. Flooding is then added to the list of hazards.

160,000 TONS

La Gotera Qanat, located near La Venta Qanat, is barely high enough for Beekman to stand up in.Studying aerial photographs, Chris Beekman estimates that La Venta's qanat system was originally 7.8 kilometers long, representing a radiation network meant to tap ground water from at least three sources and conduct it to an old estancia at La Venta where it probably played a major role in the early agriculture of the area. He calculates that up to 160,000 tons of jal (enough to fill the sumptuous cathedral of Guadalajara to the roof) were removed, most of it caused by the tunnel floor being lowered or eroded over the years. Water from the qanat would have allowed year-round farming in an area with a six-month dry season, where the water table is fairly low and the porous jal soaks up surface water like a sponge. This particular qanat could be a good 400 years old, since Guadalajara was founded in 1540.

So successful was this unusual irrigation system that, according to a local rancher, around the year 1911, water from the qanat was still being channeled down to a cistern -- still to be seen alongside the railroad tracks at La Venta -- to fill the boilers of early steam engines.

A long qanat requires a long map

As a result of cooperation between cavers and archeologists, local historians have become interested in sifting through old records for information that might indicate who built the qanat and when. They have also expressed interest in cleaning it out and protecting it. Should they succeed, the day may come when even tourists will enter that curious passage to gaze in awe at the shimmering columns of light piercing the darkness of the ex-cave we now call Qanat La Venta.

qprofile.gif (180301 bytes)
_______________________


Parts of this article appeared in the NSS News, October, 1996, pp. 227-282. For more information on qanats in Mexico, see Old World irrigation technology in a New World context: qanats in Spanish colonial western Mexico by Christopher S. Beekman, Phil C. Weigand & John J. Pint, ANTIQUITY, Volume 73, Number 289, June 1999, pp. 440-446.

 

John J. Pint