Before eight o'clock, Shen Xing came to the gate of Yungu Vocational College as promised.

Li Naijing and Zhao Wenbo's car was parked next to the college gate, and the two had just gotten out of the car and were taking care of their respective backpacks.

Shen Xing was slightly stunned when he saw their dress, he didn't expect that he and they would all think together, and even the equipment backpack was almost the same.

However, Li Naijing and Zhao Wenbo came here last time, and now they are doing this, it must be based on what happened last time, and there is a reason for this.

After Shen Xing got closer, Li Naijing looked at the backpack on his body, nodded and said, "Yes, it seems that you have prepared it in advance, and I also left you a set of tools." ”

As he spoke, he pouted into the back seat of the car.

Shen Xing looked down and saw that there was also a black backpack inside, which was obviously prepared for him.

When the backpack is opened, the contents of the bag are similar, but it seems that the quality of both the backpack and the tools inside seem to be better.

He immediately replaced the items he needed in his bag with the backpack, and put it on his back the black backpack that was used exclusively by the investigation team.

He noticed that the backpack was printed with the six-pointed star logo of Yang, which was the exclusive logo of the Special Cases Investigation Team.

After Shen Xing changed it, Li Naijing handed him a work ID, which was a temporary case handling card for the investigation team, a palm-sized hard-shell card, dark black with gold font, valid for three years.

Shen Xing took a closer look and found that it was not much different from Li Naijing's regular sheriff's certificate, and it also had a six-pointed star symbol, but it didn't have Li Naijing's sheriff's certificate holster, which looked a little less forceful.

Then Li Naijing handed over another bank card.

"This is your remuneration card, the initial password is six zeros, and if you assist us in handling cases in the future, you will be paid by piece. This time it's 3,000 yuan, and after the case is done, it will be transferred to this card within five days. ”

"Thank you!" Shen Xing took the bank card.

It's not the same if you're paid, at least you have to be more careful when you do things yourself, who makes life overwhelm him?

"Here's the thing." Zhao Wenbo introduced on the side: "In the basement of the library annex building of this vocational college, there was a haunted record ten years ago, when Brother Zheng came to investigate, but there was no result. Then there was another recorded haunting record seven years ago, and then two years ago. Well, it is said that there were still dead people on that occasion two years ago, but they were crushed by the town hall and the academy. ”

"So what's going on now?" Shen Xing asked.

Li Naijing took over and said: "A librarian reported to the school last week that he could hear some strange sounds coming from behind the door of the basement of the annex building almost every day in the past two days. Later, the school organized security guards to go down to check, but three security guards ran up and said that they had hit a ghost. ”

"Are you here the time I called you?" Shen Xing said curiously.

"Yes." Li Naijing nodded, "At that time, Zhao Wenbo and I were on the stairs in the basement, and we kept going down, but we couldn't walk at the end, and we were always going down the stairs." Later, we didn't feel right, and we looked around the floor and found some very strange phenomena, but we couldn't find the real anomaly. ”

After a pause, he said: "Later, we wanted to leave, but we couldn't get out, no matter what, we were going around on the negative second floor, and there were some bad things happening." At this time, you called, and it happened that the mobile phone had a signal, and after I answered your call, I found that the elevator suddenly became normal, and I quickly ran upstairs. ”

While talking, the three of them walked towards the academy,

Shen Xing said thoughtfully: "You said that the situation you encountered is a bit like the Penrose Ladder, also known as the impossible Steps. That flight of stairs is like a staircase that always goes up or down, but never ends. ”

Li Naijing and Zhao Wenbo were stunned when they heard this, and asked in unison: "Who is Peng Rose, is his surname Peng?" The name is strange. ”

Shen Xing knew that there were no names of foreigners in this world, and he didn't bother to explain: "Just pay attention to what I described, the staircase you may encounter is a staircase that can never be reached." ”

"Never get to the end?" Zhao Wenbo repeated.

Shen Xing originally wanted to take the opportunity to talk about "Mobius Ring" and "Klein Bottle", but these two are foreign names, and they will have to be explained when the time comes, so it's better to think about it.

The three of them went all the way unimpeded, because it was almost late to self-study, and there were not many students on the way, but these students just took a few more glances after seeing them.

And the school security guards have long been greeted by the school, and no one has stopped them.

Soon after arriving at the library, and when I approached the annex building, I saw the sheriff and a security guard who had stayed here on duty looking a little frightened, staring at the small iron door that had been sealed.

"What are you doing?" Li Naijing asked.

The sheriff pointed to the iron door and said, "There was a cry for help from inside just now, and someone else was banging on the door, and we didn't open it." ”

"It's ready to open now." Zhao Wenbo instructed.

Because there is a light above the head of this small iron door, although it is dark now, once you open the door, you can still see the area clearly.

The security guard hurriedly took out the key to open the door, and the moment he opened the door, he immediately took a few steps back, almost behind Shen Xing and the others.

The light could shine about two or three meters inside the door, and because the staircase was going downward, it was already dark and nothing could be seen at a distance.

Everyone took a closer look, among which Shen Xing, Li Naijing and Zhao Wenbo were closer, while the ordinary magistrates and security guards were far away.

There was nothing at the door.

"Are you sure you heard someone calling for help?" Li Naijing turned around and asked.

"Sure." Security guards and sheriffs nodded their heads.

"It's possible that an anomaly is at work inside." Zhao Wenbo whispered.

Li Naijing nodded and ordered: "Now we act according to the plan, and the three of us can't all go down." Shen Xing is a novice, Zhao Wenbo and I will go first, if there is anything wrong, or we need your help, we will contact you to come in. If we can't get out, we'll give a hint to the outside through the string, and you just need to pay attention to the feedback. ”

After the words fell, she and Zhao Wenbo took out a thin rope in their backpack and demonstrated the signal to pull the rope again.

I don't know what material this string is made of, it is not only slender, but also strong and tight, and after being tightened, it will not break even if it is cut two or three times with a steel knife.

The string is long and can be fastened to one end in one place, and the other end is like a belt that can be tied around the waist of the explorer, so that the explorer can be pulled out after entering a certain area.

Li Naijing and Zhao Wenbo tied their belts around their waists respectively, and Shen Xing fixed the other end of the rope of the two of them to the railing of the flower bed not far away, and pulled it twice, feeling very strong.

Li Naijing said to Shen Xing: "You also tie a string around your waist and be ready to be on standby, Zhao Wenbo and I will go down now." ”

After the words fell, she and Zhao Wenbo walked into the small iron door that opened one after another, walked down the stairs, and quickly disappeared into the darkness.

Shen Xing still remembered that Li Naijing said that all the lights in the area under the stairs were not lit, and I don't know if it was broken or because of abnormal interference, so he could only use a flashlight to illuminate.

After Li Naijing and the others entered, he tied the strings on his body, and together with the ordinary sheriff and security guards, he stared at the two thick bundles of strings on the ground as Li Naijing and the others entered the small iron gate.