Marching in a one-meter-five-wide tunnel, at the beginning, Gao Chao still squatted and moved forward, but it was really tiring, it was better to lie on the ground and crawl forward, and then everyone simply crawled and walked, and the speed was a lot faster.

Fortunately, there is no water in this tunnel, it is very dry, and strangely, the temperature in this tunnel is not low, it is quite warm, and the humidity is just right, although it is dark all around, but it makes people feel quite comfortable.

Going further, I found that there were also many small branches in this tunnel, about 40 cm in diameter, Xia Qing saw these branch pipes, and suddenly thought of the reason, and couldn't help but sigh.

"I didn't expect the Yinshan civilization to reach such a height!" Xia Qing looked very excited.

When the fat man saw Xia Qing like this, he couldn't help but ask, "Xia Qing, what do you see again?" Could it be that there is some other high-tech in this tunnel? ”

Xia Qing nodded and said, "This is simply high-tech, I finally know what the purpose of this tunnel we are in is." ”

Gao Chao and the fat man looked at Xia Qing with expressions a little helpless, but Xia Qing didn't pay attention to their feelings, but said excitedly: "This passage is part of the air conditioning system in the entire ancient city. ”

Gao Chao was stunned for a moment, and then sighed and said, "Isn't this a bit exaggerated?" Where did this air conditioner come from? ”

Xia Qing said: "The air conditioning I am talking about is not the air conditioning used by modern people, I am talking about the air conditioning system, which is pure natural and the embodiment of human wisdom, which is like many ancient cities in Europe, a large area of reservoirs will be set up, which are set up to change the environmental humidity, and now the channel we are in is also like this, you know, the geothermal resources in Gaoligong Mountain are abundant, so these channels can well transmit the underground heat energy to some of the rooms above, as long as the room is equipped with an air outlet, That results in hot air that is both warm and humid, which is nothing short of genius design. ”

The fat man was speechless, Gao Chao was cold-eyed, the two of them obviously had no interest in this kind of genius design at all, they only cared about whether they could help Xia Qing finish her research work quickly, and then quickly withdraw from here.

Xia Qing also saw their thoughts, so she had to sigh secretly, Gao Chao had no choice but to accompany her to squat in this air conditioning pipe, but the fat man had already crawled forward impatiently.

Xia Qing carefully studied the composition of the pipes, and then saw if she could remove some of the debris from the pipes and put them in her backpack, and she told Gao Chao that with this evidence, she might be able to write a paper and maybe publish it in Nature, the best academic journal in the United Kingdom, which would be a great thing.

Gao Chao didn't care, he watched Xia Qing struggle to find the fragments on the inner wall of the pipe, and in desperation, he had to take out Jiang Ji's long knife from his waist, and then easily pry a piece of fragments for Xia Qing.

Xia Qing was very happy, she opened her backpack, and then put the fragments in, just about to open her mouth to say something to thank Gao Chao, at this moment, in the tunnel in front of her, suddenly came the fat man's shout.

"Lao Gao! Come on! Here's the situation! ”

Listening to the fat man's voice was very anxious, Gao Chao didn't dare to slack off, inserted a long knife, held a torch in one hand, and quickly crawled forward.

However, in the tunnel in front of him, Gao Chao found that the fat man stood up, and at this moment in the tunnel, he could only see the lower body below the fat man's chest, and the part above his chest had actually poked out of the tunnel at this moment.

Gao Chao immediately understood that on this tunnel, someone had opened an opening.

When he got closer, the fat man was standing in the tunnel, he was holding a torch, and he had already poked his upper body out, obviously, above this tunnel, there was another space.

And this opening in the tunnel is actually not big, at this moment the fat man is standing in it, and the hole has been blocked tightly, Gao Chao can only squat next to the fat man, and then tug the corner of the fat man's clothes.

"Fatty! What do you think? What's going on above? Gao Chao asked in a low voice.

The fat man twisted his body, shrunk back from the hole, squatted down and said, "I just looked at it, it seems that there is still a tunnel on it, but the tunnel is quite spacious, you can understand it when you go and see it!" ”

Gao Chao nodded, and then poked out of the hole with a torch.

Sure enough, just like the fat man said, there is still a tunnel outside the cave entrance, and it is a very spacious tunnel, it seems that the distance between the left and right cave walls is seven or eight meters, and it is not a problem to drive two Dongfeng trucks side by side inside.

At this moment, the location of the entrance to the cave is on the side of this spacious tunnel, and this tunnel and the air-conditioning pipe where they are located are in a certain angle of intersection, but the two tunnels are very close to each other at the intersection.

Thinking of this, Gao Chao looked at the situation of the tunnel in front of him vigilantly, and then he jumped cautiously and jumped directly from the entrance of the cave.

Gao Chao squatted next to the entrance of the cave, he held a torch, observed the surrounding movements, and found that there was nothing abnormal, there were black holes at both ends of the tunnel, and he couldn't see how far away, but the air in this tunnel was a little cold, not warmer than the air conditioning pipe just now.

Seeing that there was no movement, Gao Chao stood up with a torch, he looked at the stone wall around the tunnel, and then looked up at the top of the tunnel, only to feel a little strange.

At this time, the fat man and Xia Qing found that there was no danger, and they also climbed up from the hole.

As soon as Xia Qing stood up, he looked at the tunnel thoughtfully, just like Gao Chao.

The fat man, on the other hand, had no heart or lungs, looked around with a torch, and whispered, "This tunnel is deep enough, it seems to go all the way down." ”

The fat man is right, the slope of this tunnel is not small, even steeper than the previous sewer, fortunately there is no water in this tunnel, and the ground is not slippery, although the slope is large, but it may not be difficult to walk.

Xia Qing ignored the fat man, she walked to the stone wall on the side of the tunnel alone, and then touched the stone wall with her hand, as if she had found something.

Gao Chao also walked over, he looked at the situation on the stone wall, and it was indeed a little special.

I saw that the stone wall was all pitch black, but the shape of the stone wall was very strange, like countless water droplets falling downward, but they were all solidified water droplets, and the feeling of touching them with your hands was very cold and smooth.

The fat man also walked up to him at this time, touched the droplet-shaped stones, and said, "How is this the same as the stalactites in the water hole, and it still has a feel." ”

Gao Chao glanced at the fat man and said, "As long as it has something to do with milk, you can feel it when you touch it!" ”

Xia Qing said helplessly: "This is not a stalactite, this is a recrystalline stone." ”

Gao Chao thought for a moment and said, "Recrystallized stones, are you saying that these stones are all recrystallized?" ”

Xia Qing nodded and said: "Yes, because of a certain high temperature, the crystals in the stone melt, and then quickly cooled down and recrystallized again, I think these droplet-shaped rocks are recrystallized stones, you see......"

Xia Qing spoke, illuminated a droplet-shaped black stone in front of him with a torch, and then continued: "The surface of this stone is very smooth and can also reflect light, which means that the stone contains quartz components, and it is black because it contains carbon or other rare metal elements, and all the black masonry of the buildings on the ground may also be produced from these stones, but it is very strange......"

Gao Chao couldn't help but say, "What's so strange? ”

Xia Qing stroked the stone and said: "If you want this kind of stone to melt like this, the temperature must reach at least 2,000 degrees Celsius in an instant, and it may be higher, and then these stones that have just melted and begin to drip will be cooled and recrystallized in an instant, so that such a recrystallized stone can appear, but this is simply impossible, even if it is a volcanic eruption, this abnormal situation will not occur." ”

Gao Chao nodded, then raised the torch, and looked around, the stone walls of the entire tunnel were full of recrystallized stones of this shape, and the top of the tunnel was the same, the recrystallized stones, like drops of black water about to drop, reflecting a strange black light.

Gao Chao thought of something to each other, so he said to Xia Qing: "This whole tunnel is like this, Xia Qing, do you think it will be caused by something passing here." ”

Xia Qing looked at Gao Chao and nodded slowly, she felt that what Gao Chao said made some sense, but she shook her head again and said, "If something is caused by passing here, then what will it be?" Something that has such a high temperature and releases so much heat, this kind of thing is almost the same as the sun, you know, the temperature on the surface of the sun is only about 6000 degrees Celsius, so this is unlikely, there should be no such thing on the earth......"

When Xia Qing said this, she seemed to be shivering, and at the same time, a strange look flashed from her eyes, and then she nodded secretly, and said a little excitedly: "It shouldn't be wrong!" It should be here! This tunnel should be the place leading to the ruins! ”