Ouyang Zhenxiong snorted and said, "Baby? Maybe we'll find your head in the tunnel! Be careful, it's not necessarily safer here than on the ground! ”

"Everyone, lean together, don't touch each other!" After Ouyang Zhenxiong finished speaking, he began to ride his horse and look at the wall of the passage.

Ah Fei awkwardly ruffled his long snow-white hair, grimaced at Ouyang Zhenxiong's back, and began to lie on the ground looking for something.

Wu walked over and kicked him, and said with a smile: "Handsome guy, get up, don't lie on the ground and cause destruction!" ”

"Damn, why are you kicking me in the face, Wu, you ......" Ah Fei stood up angrily, and was about to find Wu Theory.

Wu ignored him, took Liang Xue's hand, and walked forward behind Ouyang Zhenxiong.

Even though there was a black mist blocking it, Su Yu's strengthened six senses still spread out significantly. Suddenly, Su Yu noticed something unusual on the walls, and he spoke, "There are things on the walls of these passages!" ”

"What?" Ah Fei looked at the cave wall when he heard this, "Why didn't I see it!" ”

"They are obscured by perennial dirt that needs to be removed to see clearly! I can restore the true face of these cave walls," Su Yu finished speaking, and a small tornado condensed on his palm.

"Slow," Ouyang Zhenxiong suddenly stopped Su Yu with a loud voice, he took a closer look at the four walls again, and then said, "It's okay, but the wind blowing shouldn't be too strong, and it should be more relaxed!" ”

Su Yu did as he was told, waved his hand gently, and the wind rolled around on the cave wall. Then, layers of dirt were blown down by the wind and tumbled.

"Everyone, hold your breath!" Ouyang Zhenxiong said.

As layers of dirt fell, dust and smoke billowed from the passage. Fortunately, all five of them are capable of generals, and they can survive normally without breathing for a period of time.

After some time, when the wind died down, the cave walls revealed their true face.

The walls of the cave are displayed with frescoes with rough and concise lines, which are certainly not very beautiful pictures from the perspective of modern aesthetic standards.

However, if one takes into account the age of the painting of these frescoes, then everything is forgivable.

"These things have existed for more than millions or even tens of millions of years, and from the time inference, they should be the products of prehistoric civilization," Ouyang Zhenxiong observed for a while, and then spoke, "In ancient times, human beings in many places would use pictures to convey information and preserve memories.

However, these pictures seem to be records of ordinary activities, and there is no meaning in them! Let's look hard and see if you can find anything! ”

On a mural in front of Su Yu, a man with long and unkempt hair was depicted, with a circle of animal skins around his body, a log riding under his crotch, and a wooden stick with two pointed ends in his hand.

The man on the screen has his arms raised in the air, making a gesture to throw. And in the direction that the tip of his stick was pointing, a strange animal.

The animal's head is like that of a cow but it has no horns on its head and its mouth is much larger than that of a cow; The belly is like that of a pig, but it is fatter and more round than a pig.

Only the animal's head and big belly are depicted on the screen, and most of its rest of its body is not depicted!

"This is the ancients hunting hippos in the river in a canoe!" Seeing Su Yu staring at the painting non-stop, Ah Fei enthusiastically explained.

Su Yu agreed, and suddenly said: "This is obviously a desert, and there will be an animal closely related to water, such as a hippopotamus, doesn't it mean that there is a river with abundant water here!" ”

"No, this painting just shows that in ancient times this was not a desert!" Ouyang Zhenxiong said, "Moreover, it also shows one thing, a long time ago, there was a human tribe here!" ”

"Strange, why is this place a desert now?" Ah Fei asked.

"Maybe it's a natural disaster, maybe it's [***]!" Ouyang Zhenxiong said, and continued to ride his horse forward.

Su Yu looked at Ouyang Zhenxiong's dark horse, and suddenly thought of a question: just now, Ouyang Zhenxiong asked everyone to hold their breath. What about that dark horse?

Could it be that a dark horse can hold its breath?

Su Yu didn't have time to think about this question before his eyes were attracted by another mural. This mural is also a hunting picture, but the humans in it have gotten rid of the primitive life of drinking blood, their bodies have been dressed in linen clothes, and the tools in their hands have also become hard and sharp iron tools!

Similarly, the prey on the screen changes, from buffalo to elephant, from antelope to ostrich.

And the scene on the screen also changes again and again, from the rainforest to the grassland, and finally to a desert.

When the land is completely desertified, there is no picture of activity in the picture. Instead, it's piled up with all sorts of strange instruments.

Some of these instruments resemble a giant disk, and underneath the disk is surrounded by a group of people.

In the next picture, the discs are floating in the air, and there are no people on the ground...... "Flying saucers? Damn, there were flying saucers on Earth thousands of years ago? Ah Fei exclaimed.

No one spoke, and everyone's eyes were drawn to the last mural.

The final mural depicts several bulls kneeling by the river and seemingly bowing their heads to drink.

From the picture, it seems that the bulls have not been able to drink water. And each cow drops a tear from the corner of its eye, making for a very miserable scene.

Seeing this, everyone fell silent.

Ouyang Zhenxiong sighed and said, "It seems that these murals describe the process of desertification of this land. In the beginning, there was an abundance of water and delicious water and plants, but due to some man-made or natural disasters, the place gradually drought.

Although the development of human civilization is getting higher and higher, the environment is getting worse and worse. Until one day, the area was no longer suitable for human existence, and the inhabitants flew away from the land en masse.

The weeping cows, perhaps, the river in which they used to drink every day, dried up one day, and forever, so they wept, for themselves and for the land.

The creator of the mural, seeing the sad changes experienced by the land where he grew up, thought of his future from the cow, so he left this series of pictures! ”

Su Yu was silent, and suddenly thought of a sentence from the old era: The last drop of water on the earth will be the tears of human beings themselves!

At this time, the whistling sound still came from the surface and fell into the ears of the people in the passage. Judging by the speed of the fall, this passage is about a few tens of meters away from the surface.

The sound of the whistling wind can be heard at such a distance, on the one hand, because of everyone's ear power, and on the other hand, because the wind is too loud.

Ouyang Zhenxiong listened intently for a while, and said: "This black storm is menacing, huge, and quite abnormal, I don't know what happened to the west!" ”

"Ah Fei, how long do you think it will take for this black storm to stop?" Wu asked.

"Why are you asking me?" Ah Fei exclaimed while wiping the gun: "I'm not a weather forecast, and it's useless for you to ask me!" I'm good at killing people and setting fires, but I have to ask the European team for this kind of thing! Right, Team Europe? ”

Ouyang Zhenxiong listened to the wind and said, "The black storm can't stop in a short time, and we can't go out for the time being."

This underground world seems to be a long time ago, and there should be some secrets hidden, so let's take a look at it and see if we can find anything? ”

Su Yu turned his head to look to the right, and the sinking sand had blocked the road to the right of the passage, so everyone could only walk to the left.

Ouyang Zhenxiong led the way all the way, and the four of them walked smoothly. Although Ouyang Zhenxiong's rules are very strange, such as some stones can be settled, but some stones cannot be touched. Even the walls are not to be touched.

Although it was slower, fortunately, nothing happened along the way.

After walking about five hundred meters, the passage turned a corner and turned to the right.

After turning the corner, the passage began to widen, leading the group into a large hall.

There was nothing else in the hall, just tiny rooms scattered out one after another.

The doors to these rooms are small, less than half the size of an adult of medium height. These are obviously too small for modern people.

The doors were made of stone, and there was nothing on them, no locks or anything like that.

"In the underground dozens of meters deep, it is already very strange that there is a passage more than ten meters high, and there are such small houses, which is really surprising!" Ah Fei sighed.

"Perhaps, these houses were not originally built underground, but sunk because of the subsidence of the ground." Ouyang Zhenxiong said casually.

"Really? That's pretty amazing. Team Ou, could there be some treasure buried in these doors? Ah Fei said suddenly, he had rushed to a door, but he didn't push the door in.

"It's hard to say," Ouyang Zhenxiong shook his head, "Judging from the techniques of these buildings and paintings, everything here is too primitive, so primitive that nothing can be called a treasure!" ”

"And what do you explain the murals that fly away in flying planes?" Ah Fei asked, holding his head at gunpoint.

"What reason do you have to be sure that the people who built these rooms are of the same kind as the people who flew away?" Ouyang Zhenxiong asked rhetorically, "Also, without my permission, don't go too close to the door!" ”

"Team Ou, you mean, the builder of these rooms is someone else?"

"I'm just speculating," Ouyang Zhenxiong rode on the black horse and said lightly: "Those people have already flown away, why do you still build such a small house and let it sink to the ground!" ”

"And who built these little houses, and what could be in them?" Wu walked to the front and asked with a smile.

Ah Fei grinned and said, "Maybe there will be a ...... hidden inside."

(To be continued)