The main stone used to build the corridor is slate. These slates are polished into square shapes and are at least eighty or ninety centimeters thick. They use an adhesive that I have never seen before. It is slightly yellow and looks very similar to

This is the dried state of the swim bladder glue used in ancient carpentry. However, the swim bladder glue is used to bond wood and will not be used on stones, so it should be that the fish bladder glue is mixed with something else, possibly some potatoes.

It may be starch, or it may be something else, I can't say, but it is very strong, and it has not collapsed at all for thousands of years underground.

It is very difficult to break through such a tunnel. If the space was not limited and easily affected, Brother Yao Zi would have wanted to blast it directly.

Wushuang and I took turns, constantly hammering, until we were exhausted and could only break a piece of slate into pieces. After cleaning up the gravel, Lao Bai started digging.

Brother Yaozi didn't know what he thought of, and suddenly asked me with great interest: "Tell me, what will be the consequences if we dig it from another place?"

After hearing this, I said: "It's hard to say. There may be agencies, or there may be nothing. In the end, we should calm down. Don't try blindly. This place is evil..."

Brother Yaozi nodded and said that it was indeed quite evil. I originally thought it was some kind of secret passage to escape, but it turned out to be a mysterious passage that trapped people. Who would build such a thing under the city wall? It seems that it is a waste of money to build such underground tunnels.

It was a huge project, especially given the low labor efficiency in ancient times.

I was so tired that my back ached, and I really didn’t have the energy to gossip, so I took the time to rest on my backpack for a while.

According to my experience and guess, as long as you find the right place, it won't be very laborious to dig out the gate on Huangquan Road.

Facts have proved that I was right. Not long after I closed my eyes, I heard Lao Bai shouting, saying that he had dug into a place, and it seemed to be a door!

I climbed up in a hurry, rubbed my sore eyes, and looked at the dug hole. My nose almost became crooked.

According to me, this hole should be dug vertically downward first, and then cut horizontally. As a result, Lao Bai slipped and dug directly diagonally. This way the distance is shorter, but the problem is that it is easy to cause accidents.

Son, someone used to find the living door on Huangquan Road, and they were just sneaking around. As a result, they dug out a hidden hourglass-shaped trap, which was full of fine sand that had no place to move, and they buried it alive.

Fortunately, the people here were not so crazy and did not set up traps at the Shengmen Gate, otherwise Lao Bai would not have figured it out.

At this point, I could only curse a few times and crawl in along the dug hole.

The hole was not long, about two meters at most. Lao Bai dug a bigger hole in the front, like a cave. When I got in, this guy was squatting there and banging like a big mouse.

What appeared in front of me was a stone slab, which looked like a stone door, but because the hole we dug was small, we could only see part of it.

Brother Yaozi also got in, and the small space immediately became cramped. He knocked on the stone board a few times, and then said: "The board is very thin and can be opened."

I say don't worry first. Don't force things where you can use skill. It's easy for things to get sidetracked.

As I said that, I put my ear against the stone slab, supported it with both hands, and pushed it hard.

The stone slabs can shake, and a faint "clang" sound can be heard.

"It's a door. It's not complicated. It's just a top door device similar to a tap stone."

I immediately made a judgment, and I could roughly tell from the sound that the top door device was under the door. If nothing unexpected happened, it should be a small gadget with a shape similar to the current light switch, embedded in the ground. When the door was open,

, this thing will be pressed by the door, and when the door is closed, it will pop out and hold the door from the inside, which is almost the same as a door lock.

This kind of device is so common. It first appeared in some Zhou tombs. It is not difficult to open it. I asked Lao Bai to leave the engineer shovel behind while he and Brother Yaozi went out first.

Once the two of them left, the surroundings became much freer.

I once again leaned against the door and listened while pushing the door hard. After shaking it a few times, I roughly judged that the location of the door stone was at the bottom left, so I took the engineer shovel and started digging in the direction of the collision sound, and soon I was digging.

At the end, the ground is made of stone slabs, and the gap between it and the stone door is very small, but it is not seamless, and a Baipi knife can be inserted into it.

After several attempts, I roughly found the location of the door stone. I pushed the knife in my hand forward, and with a "click" sound, the door stone was pressed down by the Baipi knife. I started to push the door hard.

The stone door is not heavy, but it has become too rough in some places over time. Only a rumble and a rumble, mixed with the harsh sound of a hundred swords scraping against the ground, were heard as the stone door gradually opened.

I pulled out the Baipi knife, held up the flashlight and looked forward, feeling a little dumbfounded for a moment.

In front of me, there is still a straight corridor, foggy.

Brother Yaozi heard the noise outside and couldn't help but got in. After seeing the situation here clearly, his expression was exactly the same as mine.

Fortunately, I have seen a lot of strange things in this ghost place, and I gradually calmed down a lot. After I came back to my senses, I gently pushed Brother Yaozi: "How about you take care of that guy we arranged for?"

Brother Yaozi responded vaguely a few times before taking out an air detector.

This is our new guy. Last time in the restricted area of ​​Heizhugou, I was tickled by the gallium metal used by Fu Huicheng. Now that we have some money, we also bought some new things to keep up with the times.

As for the pace, we still can't handle money-burning things like gallium.

In fact, I was just doing this for free. The corridor was foggy and could be seen with the naked eye, so it definitely needed to be dried out.

Sure enough, the air detector immediately started ticking when I put it in.

After we went out, Lao Bai and the others came up to us and asked what was going on. I said a few words briefly and then left the place.

After I had retreated far enough, Brother Yaozi suddenly asked me in a low voice: "Do you think they have nothing to do?"

Of course I understood what he was talking about, but I was still thinking about that corridor.

"You can't say that."

I have been thinking about this weird layout, and gradually I found some clues, and said: "I thought about it, your first guess was right, this should indeed be a secret passage for escape, leading directly from the inside of the city to the outside.

.

Things like secret passages can indeed be used to escape in emergency situations, but there is another problem - what will be the result if the location of the secret passage is leaked?

As long as the enemy finds this secret passage, they can easily penetrate into their heartland from outside the city. Therefore, building such a road to trap the enemy is not a useless effort. How can I put it, it is an extra layer of insurance!

From this, we can see that the Three-Eyed Country was probably in crisis at that time, not peaceful, and there must be enemies outside."

Brother Yaozi thought about it and felt that this explanation made sense.

"Eat something and get some sleep."

I grabbed some dried meat from Wushuang and stuffed it to Brother Yaozi: "After working hard for so long, we finally found the right place, so don't worry about it so much until we regain our strength."

It took more than thirty hours to make repairs in place. During this period, Brother Yaozi went to check the air in the corridor several times. As soon as the evil miasma had just dispersed, he immediately came over to urge us on our way.

There is actually a lot of harmful gas in this place that has been covered in dust for thousands of years. It cannot be dissipated in a day or two, and we don’t have that much time to wait for the gas to dissipate. When we walked into the corridor, it was still there.

There is a bit of sour smell, but it's not life-threatening anyway, our requirements are so low.

In comparison, this corridor is much more "regular" than Huangquan Road. It is straight and straight, and the ground is very flat. After all, it is a secret passage for escape, and there are no mechanisms.

After walking for several hundred meters without any obstruction, Lao Bai, who was walking behind, suddenly said: "Did you smell a very strange smell? Well... it's a bit familiar..."

smell?

I rubbed my nose. In fact, my sense of smell has long been numb. The sour smell accumulated underground for thousands of years always has some unspeakable ingredients. Now my stomach is churning, and my nose is filled with a sour smell similar to the smell of foot sweat.

, where else can you smell anything else?

Lao Bai was quite ruthless. He only heard a few "clicks, clicks", but under such circumstances, he actually used the trick of stealing bones and looking for fragrance. The structure of his nasal cavity changed, and his sense of smell was amplified countless times. His big face and plate trembled, and he turned over.

He rolled his eyes, almost fainted, and immediately returned to normal. He gritted his teeth and said, "Yes, it is indeed a very familiar smell. That bitter apricot smell, I will never forget it in my life."

Bitter apricot flavor?

There are only two times that Lao Bai's memory can be so profound.

One time, he inhaled hydrogen cyanide and almost killed all of us.

Another time is...
Chapter completed!