The tap stone is an anti-theft device with a simple principle but a clever idea. To put it more bluntly, the tap stone is the latch that locks the tomb door from the inside.

But to make the stone door automatically lock from behind, the ancients still had to think hard.

They first made the upper and lower ends of the stone door shafts into spherical shapes, and then carved a groove with a raised surface in the same part of the two stone doors at the same level as the door seam. Then, they made a groove on the stone pavement not far from the central axis of the door.

Cut out a groove that is shallow in front and deep in back.

Before closing the stone door, people first placed the stone bar of considerable width in the groove on the ground, and slowly tilted it forward so that it came into contact with the stone door. After people withdrew from the tomb, the stone bar was

The pressure of its own tilt and the "ball" effect at the end of the door shaft automatically push the stone door to close until its top falls in the convex groove of the stone door on both sides.

At this time, anyone who wants to push the stone door open from the outside can only do so in wishful thinking.

Many friends have been to the Dingling Tombs of the Ming Dynasty in Beijing. The gate of the underground palace of the imperial mausoleum was also sealed with tapstones. In order to enter the underground palace, the archaeologists spent a lot of effort, but in the end they borrowed the walking sticks used by ancient tomb robbers.

Nail, and this door was opened.

The so-called crutch is a metal tool with a long handle at one end and a semicircular shape at the other end. When opening the tomb door, extend the crutch through the door gap, then put the semicircular part on the tap stone, and then put the crutch into the tomb door.

Slowly lift the stone and at the same time push the tomb door until the stone stands on the ground and the door can be fully opened.

However, not everyone who wants to open the tomb door will rack their brains to find a way to crack the mechanism of the tapstone. In 1928, Sun Dianying also encountered obstacles when he robbed the Dingdong Tomb of Cixi and the Yuling Tomb of Emperor Qianlong.

At that time, the bandits tried their best to open the tomb door, but they could only use explosives to blow it open. At that time, the stone door collapsed, and it happened to hit the tomb door where the body of Qianlong had been drifted due to rising groundwater.

on the sarcophagus.

Later, when the tomb of Cixi was excavated, Sun Dianying was afraid of damaging the treasures in the tomb, so he mobilized more than 40 people to use large and strong logs to forcefully break open the tomb door. After the tomb door was opened, the contents inside were found inside.

The stone was actually broken into several sections.

When Boss Yu saw the tomb door, he originally wanted to open it using the method of opening Dingling. However, the plan changed. Lao Liu's mistake in Guangdong and the arrival of the archaeological team left him no time to customize it.

That kind of tool, so explosives became his first choice.

At the place where the stone gate is one meter above the ground, where the stone blocks the door, Mr. Yu has already carved out a round hole about the size of a fist and about twenty centimeters deep. This is where he plans to place explosives.

Boss Yu didn't dare to be as unscrupulous as Sun Dianying who robbed the tomb. There was a squad of armed police guarding the excavation site a few hundred meters away. If there was too much movement, they would definitely be alerted.

The tap stones are generally not very big. Boss Yu wanted to use the impact of the explosive explosion to break the tap stones at the door. He had used this method before when he robbed the tombs of the Ming and Qing Dynasties.

At a depth of more than ten meters on the ground, there was not much movement.

The light in front of the stone gate was a little dim. Boss Yu took out two fluorescent sticks from his backpack, bent them and threw them on both sides of the stone gate. It suddenly became much brighter. Lao Ba stood in front of the door and took out detonators, explosives and some other items from his backpack.

Seal the tape and prepare to fix it in the center of the stone door.

"Baby, slow down, our fuse is not long enough, let's use this one..."

Boss Yu suddenly stopped Lao Ba with words. After walking over, he put the detonators and explosives into his backpack. He pasted the piece of plasticine-like thing in his hand on the stone door and piled it inside with all his strength.

A large part of it penetrates into the cracks of the door.

When Lao Ba saw the thing in Yu Ku's hand, he couldn't help but take a few steps back. He recognized this thing. Its full name is C4 plastic explosive, or C4 or plastic bomb for short. Its main component is polyisobutylene, which is made of gunpowder mixed with plastic.

, extremely powerful.

Plastic bombs are made from a mixture of high-performance explosive substances such as TNT, semtex and white phosphorus. They can be ground into powder, installed in rubber materials at will, and then extruded into any shape. If adhesive materials are attached to the outside, they can be

It is placed in a very hidden part and sticks to it like chewing gum, so it is called cruel "chewing gum".

This kind of plastic bomb is resistant to strong pressure, squeezing and even waterproof. In addition to being detonated by a specific fuse, it will not explode automatically due to sheer high temperature or fire. It will not easily injure yourself if it encounters a slight impact like a gunpowder bomb.

.

The plastic bomb in Boss Yu's hand was bought from the black market in Hong Kong. It could easily avoid the X-ray security inspection. He brought three of them back then, but now he only has this one left.

After pasting the bomb on the door, Boss Yu took out a metal piece that was only the size of a small fingernail, like a battery in a watch, and just stuffed it into the plastic bomb in the crack of the door, and then called out to Boss

, the two of them quickly retreated.

After retreating to the bottom of the tomb, Boss Yu stopped. After putting on a gas mask, he took out a car remote control from his pocket, looked at each other and pressed it hard.

A muffled sound of "Boom!" came out, and the ground under Boss Yu's feet shook a few times. The movement was not very loud. I believe that if you were not standing above the explosion point, you would not feel the vibration of the ground.

Even the brass bell hanging next to Boss Yu did not ring.

"It's done!"

Yu Ku waved his fist excitedly, with a greedy look in his eyes. However, he did not rush forward. Instead, he stood quietly and waited for the gas in the tomb to evaporate for a while before entering.

…

Yu Lao San underground would not have thought that the wooden house above his head was already full of people inside and outside, and that Yu Lao San, who he had placed high hopes on, would be pressed to the ground like a dead dog.

.

At this time, Yu Laosan remembered what his boss said, drinking would cause trouble. In fact, when Yu Laosi was captured just now, the bell had already been shaken. Yu Laosan also heard the crisp ringing of the bell and the barking of the dog, but after drinking

His mind was a little slow, so Yu Laosan did not ring the bell immediately, but walked to the door to wait and see. The police who had already lurked at the door swarmed him and pushed him to the ground.

The vibration coming from under the feet made everyone in the wooden house stunned. Yu Laosan, who was pushed to the ground, took the opportunity to break free without even standing up. He climbed to the table and pulled the underground connection with all his strength.

Brass bell rope.

Although Yu Laosan was subdued immediately, the signal had already been sent out.

"Ding-a-ling-ring, jingle-a-ling-a-ling..."

The crisp sound echoed in the tomb passage, and the two men, Boss Yu and Lao Ba, who had already reached the turning point, suddenly changed their expressions and quickly stepped back.

"Quickly, find the entrance to the thief's cave..."

Chen Zhi did not bother to interrogate Yu Laosan and kept giving orders. Although the situation of catching a turtle in a urn had already formed, Chen Zhi still did not dare to be careless. If the criminals felt that there was no way out and destroyed the tomb in a frantic manner, then he would have no choice.

Explained to Professor Meng.

Following the line connecting the copper bell, the robber's hole under the stove was quickly revealed. There was no light in the dark hole. Chen Zhi and others did not dare to go down hastily, because according to the information they had, the tomb robber was

The gang is armed with firearms.

Chen Zhi grabbed the loudspeaker from a policeman next to him and shouted at the burglar's cave: "People below, listen, you have been surrounded, put down your weapons..."

Before he finished speaking, a gunshot was heard from below the robbery cave. However, the robbery cave was in the shape of a slope, so it could not hit the people above.

"Tear gas!"
Chapter completed!