Gu Yu swallowed by the scrubbing eyes, and quickly pointed his thumb back and said:

"Then we have to go back. There is a pile of rocks about five hundred meters behind, and there is a hole entering the underground river below."

Sister Le waved her hand and Guyu took the lead, and the team set off immediately.

Soon we came to a messy forest of trees.

In the middle of the forest, there are piles of black rocks. When you walk into it and look closely, you will find that some of the stones have some intermittent textures.

The Nervous Knife touched the stones with her hand and said:

“It’s not a natural wind-eroded texture.”

In other words, these intermittent textures should be artificially carved.

Hairy eyes blew his beard and smiled:

"What's strange about it? Maybe it's something that cannot be verified in the age, something that is civilized but not recorded in history."

They are not an archaeological team, so they are not very good at these things.

According to Guyu's instructions, everyone began to move away these gravels of different sizes. Guyu said that the carvings on these stones were probably left over from some prehistoric civilizations. They were inevitably curious and couldn't help but take a few more glances at the textures.

Here, he found that the most common patterns appeared, the deepest carved texture, was the head of a trident.

So he wondered:

"This civilization is interesting, I am very persistent in harpoons."

Fei Renmei glanced at the pattern Gu Yu said and said:

"This pattern is the most common in Yinxu, and there is also the cobra sculpture. Don't make a fuss."

Common trident carvings in Yinxu?

Guyu wanted to know why, but it was obvious that now was not the time to ask, and these people didn't seem to be curious about "why".

The nerve knife was right next to Guyu, throwing away a stone in his hand and saying:

"In the legends of civilizations of all ethnic groups around the world, the status of tridents is extraordinary, especially in the oldest era, geographical civilizations cannot be interconnected, but in different regions, tridents are recorded almost at the same time.

And without exception, the trident is a very powerful weapon of gods and demons.

Shiva of the seal, the Nordic Neptune Trident, Lucifer's Demon Trident, and the Water God's Halberd of the China Gonggong.

Such commonality is enough to prove that this is not a coincidence, but an inevitability. Then it is not surprising that we see the carving of the trident in the Yin Ruins, isn’t it?”

Guyu nodded and continued to move the stones.

He sighed a little. If the Nervous Knife had not talked to him about the divine theories before and talked to him about the mysterious things, Gu Yu felt that this Nervous Knife could definitely be called a erudite person.

But now he is an unreliable and knowledgeable person.

The pile of stones was not small, and everyone was busy until dawn before they saw the entrance Guyu said.

This is a deep hole that goes vertically downward, and the darkness is blowing coldly.

Standing at the entrance of the cave, you can already hear a muffled rumbling sound from inside, and you can see that the water flows are relatively turbulent.

Pick up the searchlight and shine it inside. You can find that the remaining stone steps have collapsed, but they can still allow one person to climb down safely.

The nerve knife was useless and climbed down the stone steps directly. He had some understanding of water conservancy projects, and he needed to judge the water depth and flow velocity, and then determine how to cross the river.

After a while, the nerve knife climbed up and said:

"The water is very deep and urgent, and the most important thing is that it is too cold and it is quite difficult to swim over."

The sun emerges in the east, and the dazzling light makes people who have not been asleep all night feel a little dazed.

But at this time, Young Man She said:

"No matter what, we have to hurry up. It will definitely rain heavily in a while, very heavy."

Gu Yu looked up at the clear sky and became suspicious of the arthritis forecast for Young Man She.

However, the team and the others did not seem to have any doubts, but regarded them as conclusion and necessity.

Sister Le frowned and said:

"If it rains heavily, the underground river will be deeper and the water will be faster. How long will it take for the boy to rain?"

Young man She hammered his knees and said with a grin:

"The rainfall begins after three hours and fifty-two minutes, and after four and a half hours, the rainfall reaches its peak, and lasts at least six hours."

This is too many cow batches than weather forecast.

Sister Le looked at Guyu and asked:

"Is the waterway chief? Can we pass through in three hours?"

Gu Yu shook his head and said:

"I can't get through, there are too many places to turn, and the water flow here is not the most urgent. When you enter the bottom of the mountain ring, the water flow begins to be really turbulent. If you swim over, it is quite dangerous."

Julie pointed to Qiaomu next to her and said in confusion:

"Why don't we build a big raft? Wouldn't that be safe and labor-saving?"

Nervous Knife:

"The seven of us, the solid wood will definitely not be able to carry it."

Gu Yu shook his head and said:

"It's not solid, it's hollow, and the trees that sank to the ground are hollow."

"ah?"

A group of people looked at Guyu in confusion.

Apart from bamboo, they really don’t know that there are other thick hollow wood in the world.

Maoyan walked over, stroked a tree that was lying on the ground with his hands, groped for a moment, and suddenly said with a smile:

"Well, it's a paulownia tree, no wonder Guyu heard it was hollow inside. Okay, everyone is ready to lay it down and find these dead trees that fall to the ground, enough to carry us."

Fei Renmei picked up a thin dry paulownia in confusion and took a look. There was really hollow inside, which was amazing.

Maoyan explained:

"This kind of wood is not hollow, but because it is fast-growing wood and has a large marrow heart, it will leave a large hole after drying. This kind of wood is often used as speakers, and the body is light and resonant. Although it is not a good material for placing, it is enough for temporary use."

As he said that, he turned to Guyu and asked:

"What is the width of the waterway? Is it even?"

Gu Yu measured it in his heart and said:

"The width is close to four meters, very uniform, the water surface is different from the height of the waterway roof, and the water depth is uneven, which is related to the torrent."

Maoyan nodded and said to everyone:

"The width is three meters and three meters, and the short row is three, and the centipede bodies are connected to each other."

This width, walking in a four-meter-wide waterway, not only maintains a safe distance, but also allows everyone to rely on their hands and tools to control the speed of wooden ranks by using the waterway walls.

The method of centipede joints to prevent the wooden raft from colliding and damage to the stone wall when it is too long.

These people carried carbon fiber ropes, enough rivets and each person had one Annihilist engineer shovel, making three small wooden rafts, not too simple.

Anyway, you don’t need to look good, you just need to be strong enough for the time being.

After some busy work, the three short wooden rafts were finally made and connected with fiber ropes.

When the wooden raft was roped to the Dark Hanoi by them, a rumbling thunder sound came from behind, shaking Wanyu.

When the heavy rain poured down, everyone just sat on the wooden raft and went down the water.

The sound of water stayed behind me, getting farther and farther away.

Sister Le Ren and Fei Renmei took the helm, and a searchlight was set up on the wooden platoon. The dark walls around it absorbed most of the light, which allowed everyone to see the dark water surface not far away in front of them, and it was difficult to see further away.

With the light nearby, you can find that the waterway is definitely completed by hand, because you can see that the waterway is made of huge stone bricks, piled up tightly with silk threads.

The river channel is only four meters wide, with a wooden radius of three meters and three meters. It is easy to touch the stone walls on both sides with your hand.

When everyone is on the bamboo raft, they need to use the engineer shovel in their hands to scrape the stone wall at any time to control the flow rate of the wooden raft.

Julie looked at the outline of the waterway ahead and exclaimed:

"Oh my God, except for modern times, only ancient Rome had such a magnificent underground project."

Speaking of the history of urban drainage civilization, ancient Rome was a veritable veteran. Some sewers built in ancient Rome are still in service and have been blessed for thousands of years.

The Nerve Knife glanced at the outline of the waterway. As a construction engineer, he naturally had a more professional understanding of architectural history.

He shook his head and said:

"The outline is not like the ancient Roman system. The sewers in ancient Roman were slow-circular and the arc was not uniform. The sewers were entirely part of the circle, and the arc did not change. They were more like the arch bridge circles in the Chinese and Shang dynasties, so it was difficult to judge which civilization it was.

It seems that the entire sewer now does not see the wooden structure and the ceramic pipe structure. It can be concluded that the sewer must be very old. In the ancient times, only the Shang Dynasty and ancient Rome in China had the ability to build such a huge underground waterway project."

What the Nerve Knife says is basically correct, but the evolution of the sewer of the Chinese civilization here is a bit strange.

Because during the Stone Age, Chinese civilization used fired pottery pipes as urban sewers, and even at the Erlitou site of the Xia Dynasty, there were pottery pipe sewers.

However, this form was completely abandoned in the Shang Dynasty. In the Shang Dynasty, from the perspective of Yanshi Mall, the launching projects there were already stone structures and no pottery pipes were used, which was also a mystery.

Soon, the water flow began to accelerate, and everyone had to rely on the engineer shovel to rub the wall hard to slow down the wooden drainage.

At the junction of the engineer shovel and the stone wall, sparks were everywhere, and a harsh sound echoed in the narrow space.

Suddenly, Gu Yu suddenly shouted:
Chapter completed!