This cave can be clearly seen, mainly because the weathered gravel on the mountain rolled down and blocked the hole, however, because it had just experienced a mudslide, the sand and gravel blocking the hole slid down, leading to the thinner layer of gravel blocking the hole.

Xu Dong fell, this was an accident, but it was also extremely dangerous - this hole entrance could be blocked again by gravel and sand at any time!

No wonder Mu Siqing is very anxious.

Down to the hole, as everyone guessed, the entrance of the cave is only two meters high, but the gravel and sand are basically piled up in this hole, and the place where Xu Dong fell is simply a "skylight".

"Xu Dong......" Mu Siqing went to the cave and shouted while shaking his flashlight.

"Brother Dong......" The fat man couldn't stop yelling.

Qiao Yanxue took a flashlight and looked carefully inside the hole.

I saw that the cave was full of cracks, and the ground was also full of large and small gravel blocks, thinking that this was because the cave was too old, and it was caused by the weathering of the rock mass in this section of the mountain surface.

Not enough, to Qiao Yanxue's surprise, this hole is full of chisel marks, not like a cave formed by natural erosion, but like a passage dug out by artificiality!

Seeing this passage, Qiao Yanxue didn't know whether to be happy or surprised, and her mood for a while was indescribable.

However, Mu Siqing and the fat man were very worried about Xu Dong's safety, and while shouting loudly for Xu Dong, they looked forward very quickly.

Fortunately, the three of them didn't go far, and Xu Dong's voice came from the front: "Huh, I'm fine, come over quickly......"

Hearing Xu Dong answer and say that there was nothing wrong, Mu Siqing and the others were relieved.

Xu Dong was not far ahead, holding a lighter in his hand, looking at something on the wall.

When he arrived at Xu Dong's side, Mu Siqing said in a deep voice: "Why did you come in, and you won't tell us." ”

Xu Dong turned his head and smiled, and said: "I squatted there, and suddenly found that my feet were very soft, and then a hole appeared, and I fell down with it...... Hey...... I was about to come out to look for you, but you're here again......"

Mu Siqing bit her lip and wanted to give Xu Dong a look, but after a while, she finally held back and asked, "What did you find?" ”

"It's a strange feeling......" Xu Dong replied simply, and then looked at the things on the wall.

The brown wall was very wet, but there was something on it, to be precise, it should be a mural, but in the fat man's opinion, this mural was not anything special, it was nothing more than some large and small circles, some of which were broken in half because of the cracks in the stones, and there was nothing to look at at all.

However, as soon as Qiao Yanxue saw these circles, she was immediately excited, and hurriedly found the camera and took several photos in a row against these circles.

Seeing Qiao Yanxue taking pictures, the fat man was excited, and specially stood next to the mural, asking Qiao Yanxue to also take a picture for him, to keep it as a souvenir.

Mu Siqing watched Qiao Yanxue take pictures, but frowned - it stands to reason that such a place, with Qiao Yanxue's identity, it is absolutely forbidden to take photos.

Xu Dong didn't care, but looked at Qiao Yanxue very puzzled and asked, "These circles are arranged in a regular manner, and I can't see what they are, do you know what this means?" ”

Qiao Yanxue put away her camera, looked at the wall again, and explained: "This is a very old mural, so old that it may be tens of thousands of years ago......"

The fat man said curiously on the side: "Thousands of years ago? Is there anyone at that time? How can you say that this is something that is thousands or tens of thousands of years old? ”

Xu Dong has a particularly special headache is that the fat guy has an extremely poor understanding of things like antiquities, and even "Daoguang Tongbao" can put on such a thing as "Qing Dynasty cultural relics", no matter how you say it, it is a loss in front of Qiao Yanxue.

The small circles on the stone wall, when depicted, should be more complete, but after years of erosion, the stone wall weathered and cracked, forming not narrow cracks, some circles just painted on these cracks, and then naturally with the crack opened and became two halves.

In other words, there was this mural before the stone wall weathered and cracked!

The fat man was really speechless: "Even if the environment here is harsher than other places, and the weathering rate is much higher than that of other places, it is impossible to even crack the stones of more than ten meters in the mountain like this, thousands of years or tens of thousands of years!" ”

Xu Dong turned his head to Qiao Yanxue very painfully, such an academic question, Xu Dong really couldn't explain it clearly to the fat man.

Qiao Yanxue naturally couldn't focus on answering the fat man's questions, but looked at those small circles carefully.

After a long while, Qiao Yanxue said, "I suspect this is a star map!" ”

"Astrological charts?" Mu Siqing was also a little surprised, he had suspected earlier that this was a star map, but in Mu Siqing's memory, there was no constellation of stars arranged like this, and there were many stars in the sky, if it was far-fetched to make up a "star map", it was not impossible, but what was the substantive significance of that.

Xu Dong is not much interested in what astrological charts or something, in Xu Dong's eyes, it belongs to "astronomy" and the like, and Xu Dong himself is much more interested in cultural relics, antiques, treasures and other things.

Therefore, Qiao Yanxue studied the "astrological map", but Xu Dong continued to walk slowly along the passage.

The fat man followed behind Xu Dong unhurriedly, and asked Xu Dong in a fuss as he walked: "Earlier, Xue'er said that this hole was artificially dug out, Brother Dong, tell me, what kind of person will it be in this place where birds don't pull eggs, and open such a hole to play?" ”

Xu Dong replied angrily: "How do I know who it is?" ”

Qiao Yanxue caught up from behind and said very excitedly: "Xu Dong, this tunnel is very likely to have been dug by that extremely mysterious tribesman, uh...... Xu Dong, you have made a great contribution this time. ”

The fat man was very dissatisfied and said: "Didn't everyone find it together, why did you give him the credit?" ”

Mu Siqing said in the back: "Fatty, if it were you, what would happen to you if you suddenly fell into a hole that didn't know the bottom of it." ”

"I, of course, I hurried to ask for help, ah, no, it should be the same as Brother Dong, first take a closer look at anything valuable, ah, it's not right, it should be...... It should be a ...... to carefully check the surroundings."

As soon as the fat man said this, Mu Siqing and Qiao Yanxue snorted together, of course Xu Dong would not be the same as the fat man, if the fat man had fallen before, it would have been impossible for everyone to find this tunnel, and it was certain! This is the difference between the fat man and Xu Dong.

The fat man was extremely dissatisfied, didn't he just fall into a hole, it's worth praising Xu Dong like this, who was going to fight and kill to catch our brother Dong before!

As soon as they talked about the previous incident, Mu Siqing and Qiao Yanxue blushed, and one shouted: "Fat Wang, shut up for me......" The other said: "Fat Wang, you want to die, nonsense ......"

But the fat man asked Xu Dong without knowing what to do: "Brother Dong, what happened between you?" How do I feel that you guys are weird. ”

Xu Dong couldn't wait to kick the fat man, what's so strange about this, isn't it...... Isn't that ...... Hey......

Mu Siqing hated the root of his teeth, and said: "Xu Dong, I'll write this account first, if there is a next time, I will definitely kill you!" ”

Xu Dong walked in front from a distance and said with a wry smile: "Misunderstanding, misunderstanding...... It was really a misunderstanding......"

Qiao Yanxue said in the back: "Misunderstanding, the ghost believes you......"

As the tunnel gradually went deeper, the terrain gradually went up, and later, there were several steps from time to time, although a few people did not know the direction, but they knew that this tunnel might be a passage dug out by the extremely mysterious tribe, so a few people were relieved to boldly "move forward".

It's just that this passage is extremely long, until the fat man and Xu Dong can't walk anymore, and they haven't reached the end yet.

Mu Siqing sighed, this is also a helpless thing, since entering the Valley of Death, I met that group last night and rushed for another day today, basically I didn't have a good rest, no matter who it was, my body was very overdrawn.

Finding a slightly more spacious and flat place, Mu Siqing asked everyone to stop, and then instructed the fat man to make a fire and cook, planning to rest here for a night before leaving.

Originally, because it was in a tunnel, there was no need to set up a tent, and the ground was still dry, so it was a bed by taking out the sleeping bag and spreading it on the ground.

However, at this time, Xu Dong was very timid, and set up a tent without bothering, and deliberately stayed away from Mu Siqing and Qiao Yanxue.

The fat man was very surprised by Xu Dong's approach, this way, it was just a matter of staying in a hotel, if it wasn't for a hotel, the four of them were crowded in the car, and they could be regarded as living together.

Xu Dong glared at the fat man and said, "If you want, you can go live with them by yourself!" ”

The fat man scratched his head: "Brother Dong, what are you talking about, it seems that everyone is as dirty as you, in such an environment, being close to them, that is to take good care of them, what are you thinking about in your brain!" ”

At this time, Qiao Yanxue held a piece of paper in her hand, walked to the place where the fat man was cooking with a puzzled face, and said to the two people: "Hey, you two come over to take a look, isn't it strange!" ”

Xu Dong took Qiao Yanxue's piece of paper and found that on this piece of paper was the previous mural that Qiao Yanxue had painted with lipstick, and there were a total of ten small circles.

But these little circles, almost like a snake, seem to be arranged in a way that doesn't seem to be regular.

Xu Dong didn't have much interest in "astronomy", so he read it a little, and then returned the piece of paper to Qiao Yanxue.

The fat man took the piece of paper, stirred the soup in the pot, and said: "This looks very strange indeed, if it is a star sign, will it be the Big Dipper?" ”

Xu Dong shook his head and smiled bitterly: "The Big Dipper, the Big Dipper, there are only seven stars, even if you add the North Star, there are only eight in total, this is ten, and the shape of the Big Dipper is a famous spoon, when did it become the shape of this snake!" ”