After Situ Fang threw the rope over, Zhang Gong carefully tied the rope to his waist, hooked the antenna of the device with his foot, and turned his head to look at the monitor on the side. With the left and right movements of his feet, Zhang Gong looked at the monitor with great difficulty, and then instructed Situ Fang to pull the rope again and again. Soon, the slip was detected, and there was no sign of a passage.

Seeing that these statues were still moving, Zhang Gong said, "Situ, can you do it by throwing the rope from the middle to the other end?" ”

"Okay, what? Are you going to go through here from there? That's more than 30 meters long. ”

"It's okay, I think I'm close to the answer."

Professor Chen heard Zhang Gong say that he was close to the answer, so he asked, "Answer?" You're saying there's already a direction? ”

"Yes, no entrance was found around this cave, but the existence of a passage was detected on the west side, and a passage below was also found in the Bronze Man Formation just now, and the direction is also to the west, and the depth is decreasing, indicating that the entrance must be in the east or middle."

"Then you be careful, find a way to shut down this mechanism first, then it will be safe."

"The agency should be at the entrance, don't worry."

After speaking, Zhang Gong walked along the boundary of the statue to the opposite side, and after Situ Fang got a small stone from the side, tied it to the rope, and threw it over with all his strength to rub the ground.

Zhang Gong repeated his old skills, and after he finished binding neatly, he lay on the ground, raised his head slightly, and shouted "pull", and was slowly pulled into the bronze man formation by Situ Fang. The detection soon reached the center, stopping at more than two minutes, Zhang Gong rubbed his heels on the ground and turned around, and after carefully probing the central part, he shouted loudly: "Lao Chen, find the entrance!" It was really in the center, just below me, and now I was looking for a way to open the passage and a way to stop it. ”

Professor Chen watched Zhang Gong keep turning his head under the swing of the ring head knife, and shouted nervously: "You must be careful!" If you don't feel the momentum, you shout, don't be reckless. ”

"Don't worry! This little gesture can't help but bother me. ”

After speaking, Zhang Gong turned around again, then put his head close to the foot of a statue, looked carefully, after a minute, he twisted his body again, put his hand on the foot of the statue and touched it, this time he finally understood the way the mechanism was closed: under the four statues in the middle, the space was obviously wider than the others, and the straw travel shoes worn on the feet of these statues were also a little different from others, and if you looked closely, you could see that there was a slight gap between the shoe and the sub. Zhang Gong secretly laughed, and then turned in a circle and broke the left feet of the four statues, and as a result, when the feet of all four statues were all broken inward, the mechanism slowly stopped.

Zhang Gong stood up and shouted at Professor Chen with a smile, "How is it?" ”

Professor Chen tried to calm his heart, walked up to Zhang Gong and asked, "Don't show off, what is the way of the mechanism?" ”

"Look at the four statue's feet for yourself, and you'll see."

Professor Chen looked at the feet of the four statues, and then looked at the others, and immediately understood that the others were all one, and the left feet of the four statues were now all broken to the inside by Zhang Gong.

Professor Chen nodded and continued to ask, "What about the entrance?" How do I open it? ”

Zhang Gong smiled innocently: "The entrance is just below where you stand, and the right foot of these four statues should be used to open the passage." ”

"Can you now figure out how this mechanism works?"

"Almost, this should be a mechanism powered by several groups of gravity systems, inside these statues are two simple levers, responsible for the left and right movements of their arms, and the secret of controlling these is underground, composed of some gears to form a buffer, in this way the gravity is converted into power, the process of gravity release is extended, and the action time of the mechanism is also increased."

Chen Zhijun, who was more curious about physics, asked puzzledly: "Uncle, how do you judge that these are two levers?" How do you judge the following principle? After all, you don't see inside. ”

"Fool, this statue has two legs apart, and from the scan results, you can know that there are two such things inside, do you want to talk about it next? If gravity is released suddenly, then this mechanism does not exist, and it becomes a mechanism that opens the stone door, but after passing through the slow gear set, the force is output and converted, it is different, and then through the camshaft and other devices to form a high and low cycle action, this point, the ancients have long had this wisdom; Q: How do I know? Do you believe it? Each era has its own period of civilization, and you can only really interpret these technologies and look at them, and you will know what experience is. ”

"The ancients were so smart? Gear sets and camshafts are both? ”

"It is recommended that you go back and take a look at the water to turn a hundred operas, which contains all your questions, in addition, Zhang Heng's water transport elephant, Ma Jun's Sinan car, Jili drum car, etc., are all used in gears, they are all from the Han Dynasty."

Professor Chen interrupted Chen Zhijun's curiosity and asked Zhang Gong, "Do you understand the triggering method of the mechanism here?" Don't trigger this by accident. ”

"Don't worry, these four statue feet control the locking and shutting down of the mechanism respectively, and they won't be triggered."

"Then hurry up and open the passageway, don't waste time, hurry forward."

Zhang Gong nodded, and after letting everyone leave the middle part, he broke the right feet of the four statues one by one to the inside. With a muffled "bang", the stone slab in the middle slowly moved down from the side, and when the movement became vertical, a three-meter square hole opened, and inside was a passage that continued to extend downward.

Situ Fang lay on the ground and shone a flashlight inside, then walked a few steps deeper along the steps inside, and when he came back, he said, "Professor, there is a sound similar to a column of air in here. ”

Chen Zhijun hurriedly interjected again: "The humming sound in the cave or tunnel is not caused by the vibration of the air column, but the sound of air friction, and it can also be said that the air flow caused by the temperature difference. ”

Zhang Gong said with a smile: "Brother Gongzi, you are completely right this time, it seems that you have not done it for nothing in the past few years of study and engineering, it is good." ”

"If it's a passage, why is it closed inside?"

"Do you see this? Isn't it also enclosed one by one? This can effectively block the air, and can also make it more difficult for tomb robbers. ”

"Isn't every tomb so confusing?"

"Most of the ancient tombs are as soon as you enter, you can know the structure inside when you walk to the tomb road, and you can basically go directly to the main tomb within half a day."

"Then let's go down now, I want to know what it's like inside."

"Don't worry, when the air is more balanced, let's go in again, it's easy to be poisoned and lack of oxygen when we go in now."

The group all sat on the side and rested.