Before going down, Ku Ding returned to the room and picked up the red-covered book, although this book is not big, it can't be put in a pocket, Ku Ding was carrying a stick, so she simply asked Qiao Rourou to help hold it, she was empty-handed anyway.

"Master, is there any use for this book?"

Qiao Rourou took the notebook, looked puzzled, took it in her hand and looked at it over and over again, but she didn't see any difference.

"No, it's a souvenir, this book still carries some memories, so keep it as a memory."

Ku Ding said this to herself, but Qiao Rourou thought it was for her, she nodded, grabbed the notebook in her left hand, and habitually grabbed the corner of Ku Ding's clothes with her right hand.

"From here, you're going to face everything, are you ready? Girl. ”

Standing at the entrance of the cave downward, Ku Ding glanced down, the hole was indeed very deep, through the hole that had been enlarged, he could see that there was something fluttering at the very bottom, the doors and windows of the room were indeed closed, but there was wind energy pouring in here, there should be a large space below, and the ventilation should still be preserved.

"I ...... I'm ready! ”

Qiao Yatou bit her lower lip, and her right hand, which was holding the corner of Ding Yi, was a little pale because of nervousness.

"Follow me, don't be afraid."

Ku Ding was short, jumped into the cave first, and then turned around and led Qiao Rourou down with a half-pull and half-hug. The hole is enough for two people to squeeze it, and then it will be staggered.

Hunched over, Ku Ding reached out and patted the wall of the cave, the original appearance of the hole must not be seen, but the person who expanded the hole is a skilled hand, the wall of the hole is dug very smoothly and evenly, although it is a little rough, probably because of the tools.

"Who dug this hole?"

Ku Ding turned around and asked Qiao Rourou, this girl seemed to be a little nervous at this time, and her eyes didn't know where to put them.

"I ...... I don't know, there was already a hole at that time, the hole was not big, only me and Xiaoxiao could go down, Xiaoxiao was in a hurry at the time, so I went down first, I followed Xiaoxiao. The hole is now so big, it must have been dug by a few of the boys. ”

However, she remembered that she had only seen three pairs of footprints when she came in just now, in other words, maybe there were only three people who came in at that time, so he fell into a confusion for a while as he spoke.

After a moment, she reached out and touched her nose, frowning as she recalled.

"I'm not sure exactly what I'm seeing right now, but how many people come in and how many people go down, maybe it's all my imagination. However, the hole is here, and the general frame should not change, and we must have gone down to the basement below. ”

Although she was a little uncertain, Qiao Rourou finally had a lot of ideas of her own.

Ku Ding nodded, becoming more and more curious about the owner of the male footprints, if it was really as Qiao Rourou said, she and Ye Lingxiao went down first, this hole was dug by the owner of the male footprints, and the other party was obviously able to dig this hole out of such an effect.

Judging from the size of the footprints, Ku Ding's height should be about the same as that man, and it is not very troublesome to move in this hole, and when he went halfway down, Qiao Rourou suddenly pulled Ku Ding.

"Master, wait, look at it."

Qiao Rourou's tone was a little surprised, and when he glanced back, he immediately found Qiao Rourou's surprise.

Looking up from this angle, it seems that due to the problem of light, a new painting has appeared on the ceiling of the bathroom, which is supposed to be a starry sky map of a certain area. Just like the mermaid picture, this starry sky map is also vividly outlined, very detailed, if you control the line of sight only in one area, such as holding a circle with your hand to look at it, it is like sitting in a well and watching the sky.

"This ......"

Ku Ding carefully looked at the starry sky map, from this position, it was more than ten meters, and if he didn't keep an eye on it, he could only see a blur, and some subtleties could not be seen clearly at first. He walked back a bit, only to find that he couldn't see the painting when he changed the distance.

After thinking about it, he returned to his original position, took out his mobile phone, turned on the camera function, and recorded the painting, fortunately, the photography function of the mobile phone can be used normally.

"The painter is really a rare genius in this area, not only has excellent painting ability, but also knows how to use these visual skills, and even hides such things in it."

Ku Ding made a record and sighed, he found that this painting is not a simple painting, nor is it for people to be able to experience, the feeling of sitting in a well and watching the sky, but to hide a location, if this starry sky map is real, according to this starry sky map can locate a fixed area.

But who left this painting? Why do you want to stay in this place, and what is the purpose of staying here?

"Perhaps, this cave was not meant to go down, but to come up."

Qiao Rourou suddenly burst out, but it explained a possibility.

Sometime, somebody, for some reason, dug a hole from below to get into this room, left the paintings in the room, and left. If this is the case, Ku Ding is naturally not the first person to discover these paintings, and Qiao Rourou should not have been before.

"Well, if you come up from below, it looks like someone has already returned here. There were only a few people who dared to come back after the fire, and they deliberately left these things to lure me over? Or is it a coincidence? ”

Ku Ding herself muttered a few words, but Qiao Rourou heard it clearly, she was stunned for a moment, and suddenly understood the deep meaning of Ku Ding's words.

"Master, do you know that there was a fire down there? When we went down, there were a lot of ashes down there, and there were all the burnt marks on the walls, and the pillars, but how do you know? Were you there at the time? ”

This girl has become smarter?

Ku Ding leaned against the cave wall and reached out and tapped Qiao Rourou's nose.

"This school was a hospital before, and it was not difficult to find out that there was a fire in the hospital back then, and it was not troublesome to investigate, not to mention, didn't you smell some faint burnt smell?"

"Is that so?"

Qiao Rourou touched her nose again, and when she thought about it, they had found this information in the school library before, and it seemed that they no longer thought about it.

- This girl is really foolish.

Ku Ding smiled to himself. Continuing down, it didn't take long for the two of them to reach the end of the cave, and they could see a ribbon hanging from the exit of the cave, all the way to the ground. With the help of the light of the mobile phone, there are many pillars and a very open space below. However, I can see that there are some lights on the far side.