Thirteen minutes passed, and Professor Chen, with three archaeologists and a police officer, did not move at all in front, and Zhang Gong did not get a response no matter how he called through the walkie-talkie. Zhang Gong said to Zhu Gong anxiously: "Old Zhu, don't wait, I'll take a few people down first, I don't think it's that simple, if the walkie-talkie doesn't respond after 10 minutes, you don't go down again, we keep in touch every minute." ”

After speaking, Zhang Gong glanced at everyone around him with a solemn expression, and then took the lead in getting into the black. While walking, Zhang Gong carefully looked at the walls on both sides to see if there were traces left by Professor Chen and others, but after walking for almost ten minutes, he still didn't find any information, as if no one had been here at all. The signal on their walkie-talkie has been very stable, and according to the agreement, there will be a call every minute, and the sound is very clear, and no abnormalities have been found. After walking like this for 15 minutes, I still didn't see the mark he and Professor Chen made when they came down for the first time. Zhang Gong suddenly felt that his scalp was numb, and he felt more and more cold here. He hurriedly called over the walkie-talkie: "Don't come down like this again!" Remember to bring a thin line and put it while walking, and mark it with chalk on both sides at the same time, there may be hidden space here, and Lao Chen and I may not be on the same road. ”

Zhu Gong, who was preparing to come down above, felt a little unbelievable when he heard Zhang Gong say this, so he asked: "Is it so possible, you obviously went down from the same mouth, is there a fork below?" ”

"Just because I didn't find the fork doesn't mean that I didn't, the first time I walked with Lao Chen, it was about 15 minutes, and it was very slow, and now we are also walking for 15 minutes, but the speed is much faster, but I didn't find the marks we made when we came down for the first time."

"Qimen Dunjia Technique?"

"I don't rule out this possibility, the passage here now gives me the feeling that it is a very evil door, and it is not as simple as I imagined, Lao Chen is not very familiar with Qimen Dunjia, I am afraid that they have entered a dead loop space."

"Don't go yet, make a few more obvious marks around you, I'll prepare the line, and then put it all the way, mark it all the way, don't move!"

"Bring the 3D imager down, bring an extra flashlight, and let everyone else up there stop coming down."

While waiting, Zhang Gong tried to call several times with the walkie-talkie, but there was still no response on the walkie-talkie. At this time, the police officer next to him prompted: "Maybe there is no power, right?" ”

"Impossible, there are five of them with two walkie-talkies, it is impossible to run out of power at the same time, the biggest possibility is that something has blocked the signal, right! Signal! ”

After Zhang Gong was prompted by the police officers, he immediately shouted on the walkie-talkie: "Lao Zhu, come down with the field strength meter, try to find the signal they send from the walkie-talkie." ”

"Understood! Get down now! ”

After another 15 minutes, Zhu Gong and the others arrived, and the 10 people were crowded together, and the tension was reduced.

After Zhang Gong happily shook Zhu Gong's hand, he immediately became even more nervous, because he had now confirmed that Professor Chen and the others had really entered the dead loop he had said.

After searching with the field strength gauge, there appears to be a faint source to their left, but it is unstable. Seeing this, Zhu Gong said: "Lao Zhang, now cut off the line from here and fix it here, let's all go back, observe this step as we go, and at the same time you are also using the guy thing to probe." ”

In this way, Zhang Gong used the field strength meter to detect the wireless signal, and Zhu Gong used the three-dimensional imager to begin to detect the hidden space along the way it came. After about 10 minutes of probing, they finally found a hidden space on their right.

This discovery made Zhang Gong excited, he said: "It seems that they really entered another channel, good guy, Lao Zhu, you probe up again, see where the problem is, I will use the field strength meter to pay attention to the signal changes inside, if Lao Chen finds that something is wrong, he will definitely call through the walkie-talkie at intervals, and the endless loop will make them re-turn to the closest place to us." ”

"Well, agreed, now look at the space on our right is a circle, and my personal analysis may be infinite."

"If that's the case, then it's the Qimen Dunjia Technique."

"How do you crack that?"

"Have you noticed, this passage seems to be straight, but it's not, it's with a tiny arc, you can see it by shining a flashlight up and down, so there must be some gravity mechanism here, through that to switch routes."

"That means you can find out where the switching point is with the 3D imager?"

"Yes, if you don't have this instrument, it will be troublesome, but with the imager it is much easier, you keep searching, you will find it."

After continuing to walk up for 10 minutes, Zhu Gong stopped, turned to Zhang Gong and said, "Old Zhang, there is a space to hide here." ”

"What kind?"

"It's the same size as our channel, and according to the imager, it's on the edge of the circle I'm talking about."

After Zhang Gong turned off the field strength meter in his hand, he carefully looked at the feet and the wall with a flashlight, and finally made a discovery: the passage that seemed to be carved out of the mountain as a whole was cracked in some places, and even traces of fire could be seen in some places. And under a crack on the right side, Zhang Gong saw his eyebrows: a few small pieces of stone, picked up and looked at it, it was newly detached.

"Hehe, Lao Zhu, Lao Chen passed through this wall!"

"How is that possible? How did they get through? ”

Zhang Gong was about to tell him the answer, when an intermittent voice came over the intercom: "Someone... Is it there? Yes... Hear me? I'm Chen.. Mountain. ”

Hearing this familiar voice, Lao Zhang jumped up excitedly, and immediately shouted into the walkie-talkie: "Old thing, speed up a few steps, and you will stop when I tell you to stop!" ”

"Okay..., in a moment..."

Zhang Gong turned on the field strength meter again and carefully watched the changes in the readings, and at the same time communicated with Professor Chen through the walkie-talkie. Slowly, the sound over there became clearer and clearer, and the readings on the field strength meter became louder and louder, and after a few minutes, Zhang Gong ordered: "Don't go, you just stop there, I'll knock a few times with a shovel, you listen carefully, and make a reply after finding the right direction." ”

After Zhang Gong turned off the field strength meter, he took out a small shovel from his backpack and knocked it on the wall three times, and after more than 20 seconds, he got the same reply on the wall, which showed that Professor Chen and the others were only separated by a wall from Zhang Gong.