The length of the robbery hole is nearly twenty meters. It is the result of four or five hours of hard work by Lao Bai. It is very suitable in terms of shape, inclination angle, size, etc.

I crawled all the way through the Thief's Cave and soon came to the end.

The robbery cave is not a tunnel, it only allows one person to pass through. Drilling into the robbery cave to look at the wooden door is actually like peering through the tunnel. Of course, it can also be said to be sitting in a well and looking at the sky. In short, it is similar, and only a small part of the tomb door can be seen.

Brother Yaozi and Lao Bai had come in before and had already cleaned away the mud on the tomb door. At this moment, the texture of the tomb door was clearly visible.

At first glance, it looks like a stone, but it is not a stone.

The door of the tomb was dark, the color was somewhat similar to obsidian, and it felt cold to the touch. I was a little surprised for a moment.

In fact, in most tombs, although the tomb door is the most important part, compared with the tomb owner's corpse preservation technology and those crazy killing mechanisms, its craftsmanship is not complicated.

Desperation is nothing more than starting from the weight and materials.

The thickness of the tomb door of Emperor Wu of Liang reached an astonishing ten tons. It was made of pure iron. The entire door was just a big iron lump. This was considered to show its weight to the fullest. The door was indeed astonishing, and many local masters were blocked back because

The crowbar can't lift the gap at all, and the jack can't push it in.

My intuition tells me that this is not a door that uses weight to oppress people.

I put my ear against the door and tapped it lightly with my hand. The sound was clear and clear, which was as expected. The door was not thick, otherwise the sound would be very heavy when I slapped it, even like a mud cow entering the sea. I couldn't hear any noise inside.

, but the slaps on the outer skin made a sound like applause.

Since the weight is not enough, the only possibility is that the materials used are special.

I can remember several kinds of materials like this that have a dark, broad texture, look like stone but not stone, and not like metal. They are all rare and precious. I have never seen the real thing, but there are quite a few related texts.

Just when I was hesitating, a rustling sound suddenly came from behind me. Lao Bai, who was waiting impatiently outside, had already come in and asked, "How are you, little Weizi? Do you have any clues?"

"Before you woke me up, you and Brother Yaozi should have made some attempts, right?"

I asked: "We have encountered several tomb doors that were very badly made before, which made Brother Yaozi extremely annoyed. If I remember correctly, Brother Yaozi seemed to have brought a small hand-held cutting machine with him this time, right? That thing

Have you ever used it?"

"Why haven't you used it before?"

Lao Bai said: "The saw blade collapsed!"

The saw blade is broken?

I was a little surprised.

Brother Yaozi is a bit of a technical geek, and he is quite talented in machinery. He even joked with us that if he hadn't encountered that drastic change when he was young, he might have become a worker, but there is no disadvantage in joining this industry.

Due to his talent, some of the tools we carry with us have basically been modified by him.

Brother Yaozi bought the small hand-held cutting machine long ago. In the few days before setting off from Zhenwu Temple, he tinkered with it almost day and night, and made it into a battery-powered one, with terrifyingly high power.

I don't know exactly how he operated it. Anyway, after he got it out, it was very ferocious. It sawed the stone apart, but it ran out of power after just a few operations.

I probably know what Brother Yaozi had in mind when he took out that thing. He probably wanted to cut a hole in the door of the tomb so that we could get in. If it was because his battery couldn't hold it anymore and ran out of power, I would believe it.

But to say that the saw blade collapsed is a bit scary.

The saw blade of the hand-held cutting machine is made of diamond. Anyone who has gone to school knows that diamond is probably the hardest thing in the world.

Being able to break a diamond means that the strength of this door is probably greater than that of a diamond!!

I groped carefully on the door again. Brother Yaozi was struggling here for a long time, and the saw blade collapsed, but there was not even a trace left on the door!

Among the several materials I know, there is only one with such high strength.

"I understand, this is black steel!"

I sighed softly: "This door is not thick, only about ten centimeters at most. But with the little things we have in hand, we can't break it open at all. We need modern large-scale equipment!"

"Black Steel?"

Lao Bai was startled. I saw that he looked as if he knew something like this. But immediately after, Lao Bai shook his head fiercely: "What kind of mythical beast is this?"

"A mineral that occurs with volcanic eruptions."

I thought about it and said: "The scientific name should be wurtzite boron nitride. It is said that the structure is very similar to diamond, except that diamond is formed from carbon under high pressure, and this kind of thing is the high temperature and pressure of volcanic eruptions.

It is formed under conditions and is 18% harder than diamond.”

After saying this, I added something more.

The black steel I'm talking about is made from wurtzite boron nitride, but it has been processed through some special processes. The specific process has been lost long ago. I only know that this thing was a short-lived phenomenon in the Western Han Dynasty.

In the sixth year of Yuanding, Emperor Wu of the Han Dynasty sent General Fubo Lu Bode, General Louchuan Yang Pu and others to quell the rebellion in South Vietnam. The army marched into Zhuya County, which is now Haikou, Hainan Island. At that time, Hainan Island was still barren.

There were only a few native tribes in the area. After the Han army entered, many native tribes offered treasures to the Han emperor through Lubode in order to protect themselves. One of the tribes presented a black stone sword.

Lu Bode saw that the object was uneven and ugly, similar to a country woman's fire stick. He was furious and wanted to punish this native tribe for bullying the emperor. When the envoy saw this, he broke away from the guard and suddenly pulled out the Han sword from the guard's waist.

, Lubod thought that the other party was going to stab him, so he drew his sword and rose up. Unexpectedly, the messenger slashed at the tribute object with his sword. After a crisp sound, the sword in his hand was broken directly, but the black stone sword was not damaged at all!!

Lubod was shocked and asked questions quickly. The native envoy said that this was made of materials brought out when the volcano erupted. The locals believed that the volcano was the weapon-refining furnace of the gods. Naturally, these things were

The scraps of artifacts were added to a special local paint, extracted and cast, and they called it black steel.

At that time, Emperor Wu of the Han Dynasty was fighting fiercely with the Huns. Lu Bode knew the value of this item as soon as he saw it. Unfortunately, after repeated inquiries, he found out that there were very few raw materials for this kind of black steel, and it was impossible to equip the Han army on a large scale.

Although he was disappointed, when he looked at the black stone sword again, he no longer felt it was ugly. Instead, he felt that the uneven appearance looked particularly ferocious, so he named it Dragon Tooth and dedicated it to Emperor Wu of the Han Dynasty.

It is said that Emperor Wu of the Han Dynasty used the Chixiao sword used by Emperor Gaozu to kill the white snake and the dragon tooth sword to stab each other, and they were even the same.

After Emperor Wu died, both swords were buried with him in Maoling.

However, when Wuhu Luanhua Yiguan traveled south, a large number of craftsmen died, and the formula for the paint also disappeared, so black steel could no longer be made.

"Tell me, as the strongest thing in the world, can we break through this door without some large modern equipment?"

I couldn't help but say: "From the clues we have come across before, we can see that the mysterious ancient country sung in the Mermaid Song was actually very advanced in terms of metallurgy. Here again, the long-lost materials of the Central Plains Dynasty appeared.

Black Steel, it seems that this tomb is indeed the sleeping place of a certain important figure from that mysterious ancient country."

"Is this road dead?"

Lao Bai said: "No, let's quit and start digging into the robbery hole again?"

"it's useless!"

I shook my head: "I have told you a long time ago that the tomb walls and roof structure of the Bunchou Tomb will be so strong that it is outrageous. Now I have the answer. If nothing unexpected happens, the entire tomb structure will be made of

With this kind of black steel, it's like a tin-skinned bastard. We can't break through this place, and there's no way to open it elsewhere. Look, a piece as big as the tomb door is made of black steel, and this door is for

The secret passage used by craftsmen to escape is enough to show that this ancient country does not lack such things, and has even been popularized on a large scale. It also shows that the place where they live may have a large number of volcanic people..."

"There is no solution now if we co-author?"

Lao Bai was so anxious that he scratched his head and said: "If those craftsmen built a death door after leaving, then we still can't get in?"

"There is no door to death in this world. It's just like a knot. It all depends on how skillful you are."

I sneered, and if I didn't follow Lao Bai's words, I asked him to hand me the engineering shovel. I looked around in the cave, and then started shoveling directly from the left side against the tomb door.

"What are you going to do?"

Lao Bai was stunned when he saw this. He didn't need me to answer. He quickly responded: "You want to dig out the entire tomb door? Do you suspect there is any mechanism on the door?"

I really want to dig out the entire tomb door, but what I see now is only a small part. As for the mechanism and so on, I have not thought about it at all. This road is the way for the craftsmen to survive. After the craftsmen come out, there is no need.

Leave a trap door. What Lao Bai said just now is right. This door is most likely a dead door, but how can I start without seeing the whole picture? I have only determined the quality of this door now, and I don’t know anything else. Even this door is push-pull.

I don't even know if it's a floor-to-ceiling gate. Talking about cracking it is too extravagant.

After all, this is related to my own life. Even if this tomb is an iron-clad bastard, I still have to chew a hole in it and get in. If a ceremonial officer can't even get in, isn't it a joke?

As I dug the soil with the shovel, I gently rubbed the door with my hands.

As a result, more than two meters were dug out horizontally, but the edge of the door was unexpectedly not touched.

"Such a big door?"

Even Lao Bai was shocked and couldn't help but said: "Is this really a small door for craftsmen?"

I remained silent and dug for more than one meter. At this time, I felt a gap in the door with my fingers, a very small gap. It was so fine that if I hadn't had some practice with my hands, I wouldn't have been able to find it.

!

However, the gap is straight and has obvious artificial traces!

"What kind of tomb door is this? I've never heard of it!!"

I was amazed in my heart, and turned to Lao Bai who was carrying earth and said: "Let's exit first and bring in someone else. It seems that we have to work hard on this door. We have to dig up all the soil near the tomb door."

By exposing the whole door, maybe I can get some clues.

Lao Bai responded, twisted his body, and was about to retreat, but for some reason, his whole body froze.

I was still gently stroking the tiny gap, desperately trying to dig out some similar cases from my mind. I completely didn't notice that Lao Bai's face was pale. It wasn't until he pushed me gently that I

She turned to look at him.

"Little Weizi..."

Lao Bai's lips trembled and he said tremblingly: "You... seem to have been dug up..."

Excavation collapsed?

How is this possible?

I dare not say anything else. How can I dig a hole for stealing?

I saw Lao Bai squinting at the soil wall of the Robber's Cave, so he turned his head and glanced, and was stunned for a moment. I saw that moist black soil the size of a fingernail was rolling down the soil wall of the Robber's Cave in pieces.

This clearly shows that the structure is unstable and is about to collapse.

In an instant, I understood that it wasn’t that my skills were poor, it was because there was a tomb door pestle here, and the soil that poured down during the landslide was relatively loose here. I kept digging close to the tomb door, but it just collapsed!

!

I opened my mouth, but before I could say the word "retreat", the cave collapsed with a "boom", filling my mouth with water, and burying me and Lao Bai alive!!!
Chapter completed!