Professor Zhang took out a compass and surveyed it around with a compass, and then he drew a circle on the ground, "Start digging from here!"

Yan Zhiyuan immediately opened his luggage and took out various equipment from it.

"Mrs. Tang, will you use the Luoyang shovel?"

Yan Zhiyuan asked.

"I haven't used it. He replied truthfully.

"Look at me!" Yan Zhiyuan smiled, took out the Luoyang shovel, and dug into the circle drawn by Professor Zhang.

I saw her standing up straight, her legs spread apart, holding the rod of the Luoyang shovel with both hands, and digging down vertically!

When she pulled out her shovel, she brought out a handful of yellow dirt.

Yan Zhiyuan squatted down, picked out a small piece of loess with his hand, looked at it carefully, and then put it on the side of his nose to smell it, and then raised his head and said to Professor Zhang: "Professor, this is yellow clay, which is mixed with silvery-white mercury particles, indicating that the soil contains trace amounts of mercury. ”

"That's not a problem, we have gas masks. ”

Chen Tianrong said.

"Mercury vapor is so permeable that our gas masks only last five hours before we have to quit. ”

"Five hours, that's enough. ”

Everyone, you and I analyzed it word by word.

Professor Zhang threw a Luoyang shovel to Mrs. Tang and said to him: "Mrs. Tang, come and try, just dig according to what Zhiyuan taught you, with your physical strength, you should be able to learn it quickly." ”

"Good!"

Mrs. Tang took the Luoyang shovel and dug it up like Yan Zhiyuan.

Everyone else was also digging in different places under Professor Zhang's arrangement.

In any cemetery, after hundreds of years, the outside world has changed, although Professor Zhang has the ability to divide the gold and set the hole, but after hundreds of years, it is inevitable that there will still be some errors, and these errors, after a few people disperse to dig, can basically make up.

After all, no matter how much it changes, the error is still not big, and when several people dig together, there is always one person who can dig the tomb.

Professor Cheung tested the soil on the side to make a more comprehensive judgment.

An hour passed.

Where Mrs. Tang and Yan Zhiyuan were, a deep pit the size of a person had been dug out, about one meter.

Just as he poked at it, there was a sudden thud and it hit the hard stone.

Everyone immediately looked over.

"Professor Zhang, it's dug up!" Yan Zhiyuan shouted, she beckoned Mrs. Tang to come out, jumped down by herself, and carefully got the dirt at the bottom out, revealing the top of the blue brick tomb!

After hundreds of years, the blue brick tomb roof finally reappears after hundreds of years, exuding a simple and pure atmosphere, which is intoxicating.

Between the bricks, it is not cement, but a mixture of glutinous rice and soil, etc., which is very viscous and hard.

The first hurdle in entering the tomb is to break through the blue brick tomb!

Opening the top of the tomb is also a science.

If the roof of the tomb is broken by force, even if the force is uneven, the entire roof will collapse, and the interior of the tomb will be destroyed!

So there are only other methods.

Secondly, as soon as the roof of the tomb is broken, the air that has been sealed for hundreds of years inside will all be sprayed out, which is so toxic that if one accidentally inhales it, the feeling must be particularly refreshing, and people will die when they smell it!

Generally speaking, in tomb robbery works, after breaking the top of the tomb, it will be allowed to ventilate naturally for a period of time, and then let a small bird in, if the bird can come out alive, then it means that people can enter inside.

Even if the birds are not dead, they will enter wearing gas masks, just in case.

Of course, with the current technology, there is no need for any birds, and an air composition meter can solve the problem.

"Zhu Houyi, bring the hydrofluoric acid!"

"Good!"

Hydrofluoric acid can dissolve the silica inside the bricks, and the bricks are soaked in hydrofluoric acid and basically break when touched!

This is an operation that makes use of the principle of chemical reaction between hydrofluoric acid and silica.

In addition, chemical tools are used, so there is no need to cause damage to other parts of the tomb, and there is no need to worry about accidents such as collapse.

If the roof of the tomb is broken by force, even if you are lucky enough to not damage the rest of the tomb, the vibration that can be generated is likely to cause a collapse.

"Knowledge is power!"

Mrs. Tang watched Professor Zhang carefully pour hydrofluoric acid into it, and couldn't help but sigh.

Tomb robbers decades ago, how could they know how to use hydrofluoric acid, a high-grade chemical weapon!

They usually either smashed the roof of the tomb open, or used explosives to blow it up, very violently!

As for whether you can succeed in robbing the tomb, it depends either on strength or luck!

As soon as the hydrofluoric acid is poured in, bubbles continue to bubble up, and there is still a small sound of sizzle, which is the reason why the hydrofluoric acid is slowly reacting with silica.

Half an hour after pouring hydrofluoric acid, you can see that the reaction has stopped.

As Zhu Houyi stabbed down with a wooden stick, there was a rumbling sound from below, and then, a nearly pitch-black gas rose from the cave!

It was like a volcanic eruption!

For Mrs. Tang, these are the first time to see them, and they are all fresh sights.

Those gases, which had been buried in the ground for hundreds of years, contained all kinds of toxic substances, and they were all blackened.

Just looking at it makes your scalp tingle!

During the ventilation time, everyone sat on the ground and played a few games of the mobile version of PUBG.

I have to say that playing games at this time is really a good way to pass the time.

There is no doubt that under the leadership of Tang Tai's clairvoyance, Professor Zhang is eating chicken again.

After a few games played, the sun had risen overhead, and it was already noon.

Professor Zhang looked at the time and said to everyone: "It's been an hour and a half of wind, let's eat something first, don't eat too much, we should be able to go down after eating." ”

Half past one in the afternoon.

There was no black gas coming out of the cavern anymore.

Professor Zhang did not catch a bird and put it in, but put a device inside, and pulled it up a few minutes later, Professor Zhang's face showed joy.

"The mercury vapor content is less than 1%, the carbon monoxide content is 8%, and the oxygen content is 17%, although the oxygen content is a little less, but after our filtration system, it should be enough. ”

"Who's going to go down first this time?"

"Let our champion junior go down and practice his courage first!" Zhu Houyi proposed.

"Zhu Houyi, what are you talking about! Mrs. Tang, he has never been to the tomb!" Yan Zhiyuan was a little angry.

"There's always a first time!"

"You!"

"Okay, stop arguing, Zhu Houyi, it's your turn this time, right?" Professor Zhang said with a displeased face.

"Don't I just want to give him a chance to exercise!"

Zhu Houyi complained in a low voice, and glanced at Mrs. Tang with some unhappiness.

He always wanted to make Mrs. Tang look ugly, but he didn't expect Mrs. Tang not only to study well, but also to have a good game number, and even her physical strength was better than herself!

Zhu Houyi was reluctant, put on his equipment with a twist, and slowly entered the tomb along the rope.

After a while, there was a muffled sound of landing inside, "Safety, you guys start coming down!"

One by one, the crowd began to climb down.

It was Mrs. Tang's turn, he put on the equipment, and his heartbeat accelerated a little.

It was the first time he had entered the cemetery, and there were too many unpredictable dangers inside.

Although his strength is already very strong now, surpassing ordinary people by too much, if there is something highly poisonous in it, it will be a dead end for him to run into it.

However, he was also a little excited!

After all, there are many antiques buried in it that can be used by him for cultivation!

If only the aura contained in this tomb was enough for him to cultivate to the second realm of the Great Heavenly Immortal Realm!

The moment his feet touched the ground, Tang Tai's eyes adjusted to the darkness, and he slowly saw the surrounding scene clearly.

The tomb they dug out is located in the center of the tomb, the tomb is about 15 square meters, and there are eight passages on the surrounding walls, corresponding to the Bagua position!

In the center of the tomb is a Tai Chi pattern, and at two points, there is a sarcophagus!

But the sarcophagus is open!

Moreover, the lid of the sarcophagus stands diagonally, and it does not look like it has been opened from the outside, but ......

"Damn! this ...... What's going on?!! "Zhu Houyi was shocked!

"Coffin...... What's going on?"

The coffin, opened from the inside!!

It's as if the person inside woke up and slapped the lid of the coffin!!

Mrs. Tang clearly saw that the faces of Professor Zhang and the others all showed a solemn expression!