The second uncle took out a small knife from his waist bag, squatted on the ground and drew a circle along the traces of the water flowing in, and a square stone slab was outlined. The second uncle took out a small hammer again, gently knocked on the square stone slab, and then clapped his hands and stood up, "There should be an underground space underneath, and this should be the entrance." ”

I nodded, "Maybe that's why Huang Shan put this experimental bench here, he is to cover the entrance and exit on the ground...... But no, the location of this experimental bench is so strange, it is more likely to arouse the suspicion of others...... Not necessarily, he may not have imagined that his identity would be exposed, so let's come back and smash his lair......"

The second uncle looked at me strangely and touched my head, "Did I pinch too hard just now, your brain is starved of oxygen?" How do you argue with yourself there? Neuropathy! ”

I knocked his hand off, "It's useless for us to guess here, let's open it and see." ”

The second uncle reached out and buckled the gap in the stone slab, and shook his head, "It's definitely not okay to use your hands." As he spoke, he looked around with a flashlight to find something.

I pointed to his fanny pack, "What other tools do you have in there?" ”

The second uncle smiled bitterly, "What do you think it can hold in such a small bag?" Just a few gadgets and some necessities to ward off evil spirits. ”

I was a little curious when I heard it, "Ward off evil spirits?" What evil to avoid? ”

The second uncle probably felt that I had too many questions, so he made a silent gesture to me, and then reached out and groped for some corners behind those display cases, and after a while, I heard the second uncle chuckle, "Found it." ”

I turned my head and saw my second uncle walking over with a crowbar, so I asked him, "How did you think there was such a tool here?" ”

The second uncle checked the crowbar in his hand, "If Huang Shan wants to enter and exit this place, he must also use this tool, and he can't come in with a tool every time, so I guess he must have put the tool in a corner of this room." Saying that, the second uncle inserted the crowbar into the gap of the stone slab, and only heard a creak, and the stone slab was pried up.

The slate is connected to the ground by two large hinges. Seeing that this structure should have been remodeled on the original basis of an air-raid shelter, we carefully turned the thick stone slab aside, and such a black hole appeared in front of us.

My second uncle and I used a flashlight to shine inside, the area inside the cave is not very large, and the area of the laboratory above is about the same, there is a herringbone ladder directly below the cave entrance, it seems that Huangshan originally entered and exited here through this ladder.

I looked at it and thought it wasn't dangerous, so I stretched out my leg and was about to go down. As a result, he was pulled back by the second uncle, "Why are you going?" ”

I looked at him suspiciously, "Go down and have a look." ”

The second uncle glared at me, "You're crazy! No one has touched it in the next few years. Do you know what the air quality is like? If you continue to be reckless like this, once there is a problem with the air, you plunge into it, and no one can save you! ”

When I heard this, I was scared for a while, and nodded, "Second uncle, should we make a candle and put it down to see if it can be extinguished, as said in the TV novel?" ”

Before I finished speaking, I suffered a brain collapse from my second uncle, "If you say you're stupid, you'll have a light bulb." and light a candle, it's all made up in fiction and TV to deceive people! In case there is biogas in this, a Mars will go down, and the two of us will ascend to heaven directly! ”

I spread my hands, "Then your old man has an idea!" ”

"Humph!" The second uncle snorted coldly, "In this case, the safest way is to put in a living creature and see if it can survive." I think that when our ancestors stepped on the Dingacupoint, they all carried a bamboo cage with a few house sparrows, and after the tomb was opened, they were tied to the legs of the house sparrows with a thin cow tendon rope and released into the tomb. After a while, the rope is taken back to see the state of the house finch, and if it dies, then it will have to find a way to ventilate, sometimes it will take two or three days, but now archaeology uses a blower. But if the house finch is not dead, then it is basically fine, just go in directly, because some tombs are exquisitely designed and have their own ventilation ducts. There is also a situation, when you take back the cow tendon rope and take a look, there is only one leg left, and everything else has been bitten off, then don't hesitate, turn around and run. There is also the last situation, that is, after taking the rope back, I find that I don't even have a leg, and that is because ......" The second uncle paused, and I listened attentively, only to hear him continue: "That's because your rope is not tied properly, and the bird has run away!" ”

I was stunned for a moment, and then laughed, "Haha! Second uncle, you trick me! The second uncle hurriedly gestured at me and asked me to be quieter, "Don't make trouble, don't make trouble!" Get down to business! ”

I pointed to the hole and said, "What should we do about this?" There's no bird either. ”

The second uncle stood up, walked to the door and opened the door, "Generally, the harmful gas in this underground cave is biogas, and the main component is methane. There may also be small amounts of sulphur dioxide. Fortunately, our hole is facing upwards. You know, the relative molecular mass of air is 29, the relative molecular mass of methane is 16, the density of air is about 1.3, and the density of methane is almost 0.7, which means that methane is lighter than air, it will automatically drift out of the hole, plus the space below is not large, and the amount of gas is not too much, so let's just wait a while. ”

I was dumbfounded when I listened to it, feeling that my years of learning were really in vain, I was ashamed of myself, and I stretched out my thumbs to my second uncle again and again, "Second uncle! Admire, admire! Your knowledge of chemistry is too solid, and you haven't forgotten it for so many years. ”

The second uncle poked his head out and listened to the movement in the corridor, "So now this education is all exam-oriented education, learning knowledge without seeking to understand, it is completely rote memorization, just to get a high score, and the basic skills are not solid at all." We really learned knowledge because we liked it, we were interested, and we couldn't forget it for the rest of our lives, thinking that your second uncle and I were the top students in the class, especially the chemistry grades, I wanted to be admitted to Beijing University of Chemical Technology at that time, if it weren't for your grandfather......"

As soon as I heard the second uncle say bitterly that the history of the revolutionary family was about to start again, I hurriedly stopped, "Second uncle, second uncle!" Stop, let's go out and do it again, and if we don't do it, the sky will be bright! ”

The second uncle closed his mouth in disdain, walked to the entrance of the cave and looked down, "It should be almost, in this way, I'll go down first, if I'm okay, you can go down." If I faint inside, you can quickly call 110, and we will enter the game, and we can't die one, understand? ”

Of course I understand this truth, and I gave him an OK gesture, and I was still very moved by the second uncle's actions.

I watched as the second uncle descended into the darkness step by step until he stepped on the ground. He looked around, then sniffed. After making sure there was nothing wrong with him, he looked up and waved at me.

Seeing the gesture of the second uncle, I cautiously climbed down the herringbone ladder. As soon as I entered the entrance of the cave, a damp and dark feeling came over my face.

After going down to the bottom of the cave, I used a flashlight to shine around, and it was all gray concrete walls, and there was no other exit. A dilapidated table was placed against the wall, and there was a charging emergency lamp on the table, I walked over and reached out and flipped the switch, but there was no response, it should have been out of power for a long time. There was a pen on the table, but unfortunately there was nothing literal.

I turned to look at the second uncle, but I found him squatting in the corner looking at something, and I also leaned over. I saw that the second uncle was fiddling with two long things. My heart moved, could it be that this is the strange bone that Shi Shaoqi said? But how can there be two?

I squatted next to my second uncle and asked, "Second uncle, can you see what this is?" ”

The second uncle shook his head, "It looks like a bone, and there are some large and small holes on it, but it doesn't look like an ordinary bone to the touch." But I can't say exactly what it is. ”

I continued: "I met a friend at this school, and he told me that the old professor here told him that when the school building was built forty years ago, he accidentally dug up a strange bone, but no one could see what it was, and then he put it aside, and then this thing was lost, and it should be this thing, but he said that there was only one, how could there be two?" ”

The second uncle pointed to the two things on the ground and said to me, "I think this was originally one, but it was cut off by someone from the thick half." ”

Hearing the words of the second uncle, I suddenly remembered that Fang Shaoqi once told me that this bone was almost four meters long, and I looked at the length of the two in front of me, and they were almost four meters together. In this way, the second uncle's statement is correct, the original bone was indeed amputated, who is it? Nine times out of ten, it is Huangshan, because Fang Shaoqi told me that when he and the so-called Teacher Yue, that is, Huangshan, first discovered this bone more than ten years ago, it was still a complete one. But what is Huangshan doing this for?

I told my second uncle my doubts, and the second uncle reached out and picked up the stubble that was only visible to the two bones, and said to me: "You see that there is a piece missing in the middle of these two ends, and the missing piece is a rectangle, which is obviously not innate. I deduced that there was originally an object in this place, but now it has been taken away, and the person who took this thing should be Huangshan. ”

I immediately thought, "No wonder Fang Shaoqi said that Huang Shan was very excited when he found this thing, I'm afraid that he was transferred here to teach, and there was another purpose." It's a pity that what he took away should be crucial, otherwise he wouldn't have spent more than ten years looking for and researching. ”

The second uncle nodded, his expression was also very ugly, and it always felt very bad to be taken first.

When I was annoyed, I felt that the second uncle reached out and put it on my shoulder, I was a little annoyed, and my heart said that at this time, the second uncle set something close? Reaching out and pushing his hand off his shoulder. But soon, he put his hand up again.

I was a little angry, now I really wasn't in the mood to joke with him, I shone a flashlight at the second uncle, opened my mouth and said, "I said second uncle, are you ......" I said halfway through my words, and my throat suddenly seemed to be choked, because I clearly saw that the second uncle's two hands were in front of him, and he was holding the two bones and studying. I was suddenly covered in a cold sweat, if this was not the second uncle's hand, then the one that was on my shoulder, what the hell was it!