"What exactly is behind these gaps?"

Meng Chao thought about it and found out that the reason why these sewage pipes were abandoned in the first place was that after being used for hundreds or thousands of years, sewage and groundwater leaked for a long time, causing the structure to be fragile and partially collapsed, blocking all the pipes.

But apart from the collapsed section of the pipe, the deeper pipes should still be intact.

A secondary collapse caused by oneself is very likely to unblock the blocked pipe.

At least a few palm-wide gaps were cleared.

"In this case, the secrets hidden deep underground and at the end of the pipeline may be exposed.

"That's why the messenger of the Great Horned Rat God asked people to seal up the gaps."

Thinking of this, Meng Chao raised the iron drill and gently inserted it into the gap between the ruins that had just been papered over.

These gaps are just randomly covered with mud. Even after hardening, they are not very strong.

Moreover, Meng Chao input a spiritual energy into the iron drill, causing the arm muscles to oscillate at high frequencies.

Driving the iron drill is like an extremely long impact drill, which can be easily inserted to a depth of two to three meters.

Not only the iron drill, but also half of Meng Chao's arm fell into the gap.

Then he pulled out the iron drill, and a hole appeared between the gaps.

Meng Chao put his ear to the hole, and input his spiritual energy into his eardrum and cochlea, holding his breath to collect every bit of movement underground.

Sure enough, he heard the sound.

In addition to the sound of a large number of garbage bugs working hard deep in the sewage pipes, there are also extremely subtle and regular vibrations.

Ding ding ding, ding ding ding, ding ding ding.

"Is this... someone doing soil work underground and digging pipelines?"

When Meng Chao was in Longcheng, he became familiar with Lu Siya, and learned many underground operation techniques from this senior prospector.

He immediately recognized the sound of continuous drilling and excavation.

"It's really weird. It seems like you don't have to dig so hard to clean the sewage pipes, right?"

Meng Chao squinted his eyes and observed the crumbling ruins in front of him.

He clearly calculated the distribution of the ruins and the angles of mutual support.

Then, deep in the ruins, a hole not much larger than a fist was slowly dug out.

His movements were gentle and careful, and when he moved each rock, he was as careful as moving a crystal-carved flower bud.

Every time two or three rocks were moved, one had to stop, recalculate, and fill in new rocks around the cave to support the fragile structure above.

Even with the combat power at the peak of the Earth realm and the computing power at the peak of the Heaven realm, it still took more than half an hour to open a two to three meter long hole deep in the ruins.

Meng Chao looked at the fruits of his labor with satisfaction, took a deep breath, and the bones all over his body shrank with a faint "crackling" sound.

The whole person shrank in an instant, and he fit through the hole, which was not much bigger than a fist.

His arms were contracted to his chest, and they were stretched straight from his pelvis to his toes. The main muscle groups around his body could not exert force. He could only rely on the tiniest muscle fibers to drive the strength and softness after being infused with spiritual energy.

The hairs on his body vibrated at ultra-high frequencies, using wave-like power to push himself in.

It took five minutes to get through the hole, which was only two to three meters long.

Meng Chao regained his figure and gasped for air.

What was inhaled into the chest was a solid stench.

Yes, Meng Chao has spiritual protection.

I still can't help but want to cough and vomit.

This ghost place is simply a hundred times more dirty than Dragon City's underground sewage system and the lair of giant sandworms.

Even he couldn't bear it. He really didn't know how those rat children who had never practiced psychic powers and didn't even have half a mask for protection could survive here for a year and a half as garbage bugs before dying silently.

of.

"Well, regardless of whether the Dragon City civilization in the previous life was good or bad, at least the demise of the Turan civilization is not a pity. In other words, it is simply unacceptable for such a 'civilization' to survive."

Meng Chao thought to himself, "It is a pity that the Holy Light camp that destroyed the Turan civilization is not a good thing. Moreover, it is obviously the sin of the superior clan masters, but thousands of innocent rat people are still buried with them. In the end,

, and dragged even the more innocent ordinary citizens of Dragon City into the abyss!

"No one in this world can be an isolated island. If you want to save every innocent ordinary citizen of Dragon City, it seems that you must first save every innocent rat citizen!"

He blinked his eyes, constantly zooming in and out of his pupils in the darkness, adjusting for the best visual mode.

At the same time, he made a ball of mud and used an iron drill to bring it to the exit of the cave, barely blocking it up. For a while, he probably wouldn't be discovered by the careless rat people.

Then, like a giant lizard born in a swamp, he used his hands and feet to sneak silently on the rusty wall of the sewage pipe.

Rounding a corner that was mostly collapsed.

A faint light appeared ahead.

Because flammable and explosive methane and poisonous gas accumulate underground, and the advanced orcs lack the technology to manufacture electric lighting equipment, the garbage bugs carry crumpled paper lanterns filled with glowing insects similar to fireflies.

, the collision caused the lantern to crackle.

With the help of the dim light emitted by the insects, Meng Chao saw dozens of skinny children who looked like lonely ghosts. They simply covered their mouths and noses with cloth dipped in water and waved mandala branches and wild beasts.

A simple tool made of bones, working hard to dig and dredge.

Most of them are under ten years old.

Even children with slightly mature faces are severely malnourished by Dragon City's standards, with big heads and small bodies, resembling a skeleton version of a big-headed doll.

Their limbs are so slender and disproportionate to the simple tools. Every time they swing their hammers and shovels, they feel like they are being carried away by inertia, making people worry whether they will fall headlong into the smelly garbage.

, and then, sleep to death forever.

A sight even more heinous than the leprosy village deep in Chao City made the corners of Meng Chao's eyes twitch slightly.

Especially when he discovered that two children were wearing a small and exquisite colorful conch around their necks, but the color was so polluted that they could not see clearly, the flames that suddenly erupted in his eyes could not be extinguished for a long time.

But he was not impulsive.

The experience of the fierce battle in Dragon City and the continuous awakening of memory fragments from his previous life have made him grow into a ghost assassin ten times better than his previous life.

Know how to lie dormant silently and patiently look for opportunities. If you don't take action, you will be fine. If you do, you must seal your throat with a sword.

"What these rat children are doing is the most common dredging and cleaning work. Even if the clan warriors can endure the stench and come here, they will not find anything unusual. They are not the target I am looking for."

Meng Chao put his ear against the wall of the pipe and listened, and found that the sounds and vibrations of the excavation came from deeper underground.

It seems that he has not reached his destination yet.

This is a shallow surface.

The scale of the sewage pipe is huge, with a diameter of more than three to five meters, enough to accommodate a Tauren warrior or a wild boar warrior to pass side by side.

And it extends in all directions and is intricate, like an underground maze, spreading towards various areas of Black Corner City.

Not all pipes need to be cleaned. Many places are dark and no garbage bugs are working.

Even in places where garbage bugs gather, they are often dizzy from the stench of poisonous gas and tortured to death by the heavy work. Their eyes only focus on a very narrow space in front of them, and they have no intention of paying attention.

It was also impossible to see, very close at hand, a shadow as thin as cicada wings, moving quickly in the darkness.

Meng Chao easily bypassed several groups of garbage bugs.

Gradually dive into the ground, to a depth of thirty to fifty meters.

The pipes here are getting narrower and narrower, and the air is getting filthy. It takes a long time to sneak around and you can see a little bit of swaying fireflies.

Logically speaking, it doesn't look like a large team of people are working on the ground.

But Meng Chao re-captured the unique aura on his cloak.

This means that Half Face or someone else sent the rags torn from his cloak here.

Meng Chao thought for a while, then used an iron drill to drill three holes in the soft ground vertically downward, in the shape of a "pin", with a certain distance apart.

Then, he scooped a few handfuls of sewage from the corner of the pipe and poured it into the hole until it was level with the ground.

He lay on the ground and carefully observed the speed of the liquid level falling and the bubbles emerging from the depths of the hole.

This is the technique Lysiya taught him to determine whether there is an underground cavity below.

If this is the lowest level of the underground space, there will be dense and uniform rock layers below.

Then the speed of the liquid level falling should be relatively slow. For the holes in three different positions, the speed of the liquid level falling should be almost the same, and there should not be too many bubbles coming out.

If the liquid level drops quickly, the liquid level in the three holes drops at an uneven speed, and a large number of bubbles come out, it means there may be a huge space below.

If the liquid level drops extremely quickly and there are no deadly rock formations around, there may be underground buildings made of reinforced concrete or even metal.

"Sure enough, this is not the deepest part of the earth.

"Underneath these sewage pipes, there are even more massive and complex underground space systems.

"This is a predictable thing.

"You know, even the underground of Dragon City has layers of underground spaces hundreds of meters deep.

"Some places are military facilities built in the Earth Age to prepare for World War III.

"In some places, after traveling to another world, relying on the ancient ruins, the hive dungeon continues to extend.

"Dragon City only has a history of a short thousand years, and the real large-scale modern urban construction only happened in the last two to three hundred years.

"The peak period of the Turan civilization's true prosperity was thousands of years ago, or even nearly ten thousand years ago.
Chapter completed!