Later, I don't know where I crawled, because the trend of the snake cave is too weird, and the depths have already made people even blur the direction, the only good thing is that the snake cave I am in at the moment has become relatively wide, and people no longer need to crawl on the ground with their whole body in it, they can crawl on their knees, and when necessary, they can turn around directly.

After crawling for a long time, the joints of my limbs were bent for too long, and they all seemed to be stiff, and just when I couldn't support it and wanted to stop and catch my breath, suddenly, I heard a very slight movement.

I said that my ears are very smart, and the movement is very small, if Wang Zehai and others were in this environment, they would definitely not be able to hear, but they couldn't escape my ears.

After listening carefully for a while, I was surprised to find that it was actually the sound of water!

In this snake cave, how can there be the sound of water?

I was startled, and I didn't forget my tiredness for a while, and immediately continued to crawl forward along the entrance of the cave, the further I went, the wider the snake cave became, and finally, the whole snake cave suddenly expanded to a full height of one person, and at the same time, I felt the soil under my feet become very hard, because it was crawling, so this hard feeling was obvious, and it hurt to kneel on it.

I pulled the ground with my hands, and a thin layer of dirt was peeled away, revealing the rocks below.

I was stunned for a moment, I knew that the yellow sand of the desert is only the surface layer of the weathered rocks, generally speaking, there is a small amount of soil under the desert, and then the lithosphere, and in deeper places, it is said that there are 'ancient underground waterways', but I didn't expect that I had actually climbed to the lithosphere?

At this time, I also discovered the source of the sound of water.

The end of the snake cave has finally arrived, and at the end is a circular hole**, about three meters in diameter, all of which are rock structures, and the most important thing is that this hole**, you can already see obvious artificial traces, because there are many carved murals on it.

On the ground in the center of the hole, there is also a hole, straight up and down, and the light can't see the bottom, and the sound of water I heard before came from this vertical hole that went straight up and down.

Except for the vertical hole in front of him, there were no other holes around, and even the giant python was gone.

I was stunned for a moment, thinking: Is that python still under this vertical hole? Could this vertical hole be connected to groundwater? Tan Blade: What about them? Is it down here? Who made this 'snake hole'?

I was so confused that I thought it was so strange that I couldn't help but look at the pattern carved in the rock. Perhaps from these patterns, you can see some clues.

The pattern on this rock looks extremely ancient, because the lines and drawing methods are very simple and primitive, and I feel that there is no technical content, and for this reason, I can't recognize many things depicted on it.

This is supposed to be a rock art of a recorded nature, and the specific time is not shown, but according to the above content, it is revealed that this oasis, including a large area around the oasis, was once the territory of an ancient civilization, and due to a very serious disaster, a 'water' campaign was carried out at that time. To put it bluntly, it is to dig up groundwater.

Gurbantunggut, belongs to the semi-fixed and semi-mobile desert, it is not like the Taklamakan Desert is full of grass and sand sea, on the contrary, there are still many plants such as Halaxon on the ground, and the depth of sand content is far less than that of the Taklamakan Desert, that is to say, its actual formation time is not long, so the various resources under the desert are still very rich.

Han Zitong is engaged in geological research, along the way I heard her talk about the state of the desert, in fact, the investigation of Gurban, began before 1949, but for some reason, it was suddenly interrupted for a period of time, and Wang Zehai's father Wang ** Guo did the investigation at that time, which was the early stage of the recovery of desert investigation.

At present, Gurbantunte has a large oil field, and sand control and forest protection are also actively carried out, and the effect is very significant. However, among the results of many investigations, there is very little information about paleogroundwater. Han Zitong didn't mention this matter at that time, and he didn't expect that in ancient times, someone had already started the idea of fighting ancient groundwater.

I can't help but speculate, could it be that those caves are actually the products of the ancients' 'drawing water'?

But this petroglyph looks very old, if the cave is the product of the ancients, why hasn't it collapsed yet? You know, the position I am in is actually not deep, so the surface sand structure is soft, even if the hole is drilled, it is impossible to maintain the hole for too long if it is not reinforced.

Could it be that the caves I see were not dug by the ancients? If it was excavated by today, then who made such a big project?

The cave ** I am in at this moment, and the 'snake hole' I climbed when I came, are obviously two styles, which makes me more sure of this guess: the snake cave and the current hole** were not dug by the same group of people. The cave ** I am in now should be a 'water' hole dug by the ancients**, and the snake cave when I came here is likely to have been dug by someone else in recent years.

In this way, the strange structure of this 'snake hole' can be explained, and with modern technology, it is not too difficult to excavate such a hole, and it does not even take too long.

The situation in front of me is beyond my comprehension.

Who would dig such a hole? And this hole happens to be connected to the 'water outlet' dug by the ancients, which is obviously not a coincidence.

Could it be that the real goal of the people who dug this hole is this 'water outlet'?

I didn't dare to waste any more time, so I took my eyes off the petroglyphs, climbed to the vertical hole, and turned the lights down.

It's still a black hole, you can't see anything, you can only hear the sound of water, judging from the sound, the groundwater connected under this vertical hole should be very abundant. There was no other entrance or exit to this place, and both the giant python and Tan Jian were gone, and it was obvious that they must have gone down to the bottom of this vertical hole.

What's next?

I don't know, but since I'm here, I can't just go back, and I haven't seen the shadow yet.

I untied the rope around my waist, strapped a portable searchlight for lighting at the end of the rope, and put the rope into the hole.

The length of this rope is about 12 meters, and the small searchlight used is a concentrating type, although it is discounted because of its size, but the lighting distance is several levels higher than that of an ordinary flashlight, and the light is out, and a small cluster of straight light can shine to 30 meters away.

But just now, I used this small searchlight to hit down, but I couldn't see my head, so now I can only add another ten meters of rope to probe the situation below.

Soon, the rope was lowered to the bottom, and the searchlight was already close to forty meters underground.

This depth is quite amazing.

The harder the rock formations are closer to the interior of the earth's crust, and the deeper the groundwater, the higher the quality, and until now, even in modern times, the higher the quality of the groundwater, which has not been exploited until now. But in ancient times, people dug such a deep hole to extract groundwater to fight the drought.

How did they do it?

The diameter of this vertical hole is about one meter, straight up and down, and if people go down, they must use ropes or hanging baskets and other things. I think it's very strange, if it is for drawing water, then the structure of this vertical hole is not convenient for taking water at all, since the ancients had the ability to dig out this water inlet, why not just make stone steps or water wheels and other things?

At a depth of more than 40 meters, from where I was, I couldn't see the details clearly, but I still didn't see it to the end.

My heart cooled.

With such a deep inlet, if Tan Jian and the others fell, they would definitely fall into the groundwater.

If groundwater is flowing, then they are likely to be washed deeper into the ground.

Oh, my God.

It suddenly occurred to me that the chances of them surviving were too low.

This great possibility was like a basin of cold water pouring down, making me cold from head to toe.

What now?

Go down and have a look?

But how deep is this spout?

My rope is clearly not enough now.

If I wanted to go down, I would have to go out and get the ropes, and as soon as the thought came to me, it occurred to me that even if all our ropes were combined, they would not be enough. Because we are going into the desert, not for mountaineering expeditions or anything, the ropes we carry are not the kind of long professional climbing ropes, but the kind of ropes that tie things and buckle them. Even if I go out now, I won't be able to make up forty meters if I deduct the rest together.

What's more, this vertical hole is obviously more than forty meters.

I became agitated, couldn't help but scratch my hair, and felt a wave of weakness and mania.

How can I save someone?

Those five words swirled around in my head.

I forced myself to calm down and think of a solution, and in the middle of nowhere, a cacophony suddenly sounded.

The sudden sound of this voice made me feel excited.

The sound also came from the vertical hole, but this was different from the sound of water, it was the whistle, that is, the signal whistle that each of us wore around our necks!