While Anna Liu and I were talking, I suddenly heard a banging sound. It sounded like a sapper digging something very hard, which was particularly harsh in this tunnel.

"Holy shit, what's so hard! Hexuan, I can't dig it anymore, there seems to be a big rock in front of me." Li Dadan suddenly shouted.

Now that we have gone tens of meters underground, it is very quiet in the cave. Li Dandao's sudden voice almost scared me to death.

"Here, put this on first." Just as I was about to speak, Anna Liu handed over two things from behind.

I reached out to take it, shined it with my flashlight, and found that it was actually two gas masks!

This gas mask is very delicately made, with a glass mask on the front, and a small bottle connected under the mask, which seems to store oxygen.

"This is the latest technology gas mask I brought from the United States. What's underneath is highly concentrated pure oxygen. This mask will filter the surrounding toxic air, and then automatically mix the pure oxygen, simulating the oxygen concentration of ordinary atmosphere for you to breathe. This

A bottle of pure oxygen can probably allow you to breathe normally for three to four hours." Anna Liu explained in the darkness.

I didn't waste any time, just took it over and handed it to Li Dadan!

"Why do you still need to bring this thing!" Li boldly took the gas mask and illuminated it with a flashlight for a while, looking a little reluctant to wear it.

"Put it on quickly, don't talk nonsense." I said angrily. Anna Liu was obviously an expert. There must be a reason why she asked us to wear it.

But I was only halfway through my words when I suddenly heard a porphyry sound. The sound lasted for about a second, and it also had a "turning" sound, and then a stench hit my nostrils!

"Fuck, you fart here!" I cursed immediately! I quickly put on the gas mask!

Anna Liu behind me also quickly put on a gas mask. As soon as I put on the mask, I felt that the stench was much lighter!

"Hey, this fart is just the anger in my belly. How can I not let it go? Look at this place, I can't help it. I'm sorry! I'm sorry!"

Li boldly rubbed his nose proudly, then put on the gas mask, and gloated: "Actually, it doesn't stink very much! Right!"

At this time, I almost had the urge to kick him to death. This guy's face is thicker than the city wall, and he is so indiscreet in front of ladies. This guy will definitely be a bachelor from now on. Just for this, I can guarantee that he will be a bachelor.

Can't get a wife.

"Okay, stop making trouble, we are here." Anna Liu said sharply when she saw the two of us talking nonsense here.

"Are we there? There is a big rock in front of us and we can't get through it." Li DaDa refused to be outdone.

"The big stone is fine. Take this." Anna Liu threw a steel-edged dagger over and pointed at the stone and said, "First use the engineer shovel to push away the soil around the stone. Find

Find where the edge of the stone is. This should be a square brick, maybe rectangular or square. When you find the edge of the square brick, use a dagger to dig out all the soil inside."

"Okay!" Li DaDa did not hesitate to do anything. Although there was a small episode just now, he still worked very hard.

Because he was in front of me, I couldn't help him.

Li boldly followed Anna Liu's instructions and quickly cleaned up the mud near the brick. Sure enough, after he cleaned up the mud, a square brick about one meter wide and half a meter high appeared in front of us.

"It's really a square brick, rectangular!" Li boldly said in surprise. I hurriedly looked at it with a flashlight and found that it was indeed a square brick. It seemed that Anna Liu's guess was right, and her method of finding dragons and acupoints was really accurate.

"Hurry up and dig!" I immediately urged Li DaDa when I saw that he only talked and did not work.

Li boldly said, and without saying a word, he started digging out the mud from the gaps in the square bricks according to Anna Liu's method.

Taking advantage of this opportunity, I plan to ask Anna Liu about this ancient tomb!

"Anna, why do we need to wear gas masks? Is there poisonous gas in here?" This is my first time going to a tomb. There are many things I don't understand. We all learned theoretical knowledge about cultural relics in school. The real

I have never learned the taboos about going to a grave.

As the saying goes, Anna Liu is a member of the International Association of Archeology and a senior archaeologist. Her grandfather is the world-renowned Dr. Samuel. She is definitely much better than us in this regard.

Anna Liu also knew that I didn't understand, so she patiently explained to me: "Usually such tombs that go deep into the ground contain poisonous gases. These poisonous gases are not man-made, but formed naturally."

"A more scientific explanation is that after the tomb is sealed underground, the bacteria in the tomb will naturally produce a poisonous gas through fermentation and decomposition. This poisonous gas is similar to the miasma in the mountains and is highly toxic to the human body.

, so we must wear gas masks, otherwise we may be poisoned."

Anna Liu was very detailed and very simple, and explained the source of the poisonous gas in the tomb.

"Oh, that's it. So you really need to wear a gas mask when going to the tomb." I nodded with sudden realization.

"That's for sure. There are many anti-theft methods in ancient tombs. This natural poisonous gas is just a naturally formed one. It is not specially set by the owner of the tomb. In fact, there are many man-made poisonous gases, but ordinary blood bathing cannot be separated.

Yes, only some large tombs of princes and nobles have such settings, so you must be careful to avoid this poisonous gas when going down to the tomb."

Anna Liu really knows a lot about tombs and absolutely knows all the details of how to go to a tomb. This alone is enough for me to admire her.

I thought for a while and then asked: "How did the ancient tomb robbers get in if they didn't have gas masks like our modern ones?"

Anna Liu laughed and said: "Then you have to ask those people from a family of tomb robbers. I am not a tomb robber and I don't know. But I know that tomb robbers usually put some living things in before going to the tomb. If these living things die,

, then it proves that the tomb is poisonous. If the living creatures are fine, it means that the air in the tomb is fine, and the tomb robbers can go to the tomb with peace of mind."

"So if they find that the living creatures are dead, they will abandon this tomb!" I thought about it carefully and felt that based on the ability of ancient people, it should be impossible to have such a thing as a gas mask.

Unexpectedly, Anna Liu shook her head and said: "Ordinary tomb robbers will indeed retreat when faced with difficulties, but as far as I know some powerful tomb robbers have special methods. They are not afraid of these poisonous gases."

"There are really people with such great abilities!" I was a little surprised. It was really hard to imagine how they could descend into a tomb full of poisonous gas in the ancient era without modern technological products.

Imagining the scenes of tomb robbers entering those poisoned tombs in the past, I have a longing to see how they did it.

Just when I was yearning for those scenes in ancient times, Li boldly said loudly in front of me: "Okay, these bricks can move!"
Chapter completed!