Compared with the primeval dense forest before, looking at the deep valley in front of him at this time, Zhang Yang's expression was obviously full of solemnity at this time.

"This is it." , pointing to a stone wall in front of him that was not much different from the surroundings, Professor Hu suddenly walked over.

Carefully removing some of the weeds piled up next to the stone wall, Professor Hu dug on the stone wall with his hand for a moment, and a mural that stunned Zhang Yang and the three of them was revealed.

Frowning, he carefully looked at the words on the mural for a while, and Zhang Yang's eyes couldn't help but look at Professor Hu with confusion.

"As I said before, I'm an archaeology major. And the text on this mural is the small seal font after the unification of the Qin Dynasty. I can recognize it. Glancing at the three of them, Professor Hu smiled bitterly and continued: "You have also seen the pictures on this mural. It's almost the same as a ring eclipse. However, the text calls this the 'remnant star of the moon', and those annotations are precisely talking about the astronomical phenomenon of 'annular lunar eclipses'. ”

"What does all this have to do with leaving?" , Raising her eyebrows, Xue Li glanced at the pictures on the stone wall, as well as the handwriting that she couldn't read at all, and said tentatively with a little uncertainty: "Whether this mural is related to whether you can leave or not, right?" ”

"I don't know." Gritting his teeth, Professor Hu hesitated and said, "Actually, I have been here for almost thirty years. And just five years after I came here, twenty-five years ago, I discovered this place with a few people who were with me at the time. ”

His expression was slightly dazed, and Professor Hu smiled bitterly: "After discovering this mural back then, we planned to study it for a long time. Oh, but ...... at the time."

A look of self-deprecation appeared on his cheeks, Professor Hu glanced at Zhang Yang and the three of them with a little embarrassment, and said hesitantly: "At that time, because I had an upset stomach, I went to ......."

"But as soon as I squatted down, I found that it was getting dark. Because I didn't pay attention to the celestial phenomena at the time, I don't know if there was the so-called moon circumference. But now that I think about it, it is very likely that there is that kind of unbelievable celestial phenomenon. It's just that the time was really short, very short, and it was just a blink of an eye. So I didn't care, I just thought it was my own delusion. He sighed violently, as if thinking of a certain memory, Professor Hu's face was obviously filled with pain.

"When I came back here after I was done, I found that those friends were inexplicably gone!" , couldn't help but glance at the mural, Professor Hu said with a strange face: "At that time, I wondered if it was because of something that they left suddenly. But when I took a closer look, I found that the footprints actually stretched into the stone wall. ”

"It's horrible, it's an unbelievable feeling! Because it was also night, and you don't know, I was terrified. Then without thinking about anything, he turned around and ran. I didn't know how long I had been running, I just ran and ran, and finally I fell hard and fainted. By the time I woke up, it was already dawn. I finally couldn't help but be curious, and I mustered up the courage to come back and take a look. When I came back again, thinking of the fact that the footprints of those missing companions had extended into the stone wall, I carefully identified the words on the mural ......", sighed violently, and Professor Hu slowly walked to the side of the stone wall and stroked it.

"Once I could make out the handwriting, I knew they were in! As for the above content, it is about the moment when the annular lunar eclipse comes, which is the moment when the stone wall opens. And this mural similar to the stone gate, according to the text annotation above, was actually established during the Qin Dynasty. Although it is not explicitly stated in this text, I think there must be some great secret hidden in it. And this secret probably has to do with why we were arrested here. Again, maybe it will help us leave. Listening to Professor Hu's repeated words, Zhang raised his brows and couldn't help frowning.

Although at this moment, Professor Hu's expression was not abnormal, but Zhang Yang felt indescribably awkward. It seems that there are some vague doubts, and they are always lingering in Zhang Yang's heart.

Shaking his head, Zhang Yang temporarily suppressed the thoughts in his heart. But just as Zhang Yang was about to say something, Bi Ren next to him opened his mouth coldly, and pointed to the sky with a trembling finger: "This, this, is this an annular lunar eclipse?" ”

Zhang Yang and the three of them subconsciously followed Bi Ren's fingers and looked at the sky.

Because there is no dense forest around, the eyes of the three of them can also see the scene in the sky without obstruction.

The dark sky is like a curtain. There are scattered stars all around. At this time, the moon, which should have been a little clear, was slowly swallowed up by a roll of black.

In the blink of an eye, the blackness almost completely covered the fall of the moonlight. What's even more strange is that with the black shadow covering the full moon little by little, the stars in the surrounding sky are dimming little by little.

While the stars disappeared from view like lights turned off, the moon was completely replaced by a ring with a glimmer of light.

"Annular lunar eclipse!" , The tone of shock in his mouth was full of shock, and when he heard Professor Hu's words, Zhang Yang subconsciously looked at the mural.

As soon as his gaze moved, Zhang Yangden was dumbfounded. At this time, the location of the mural still exists on the previous stone wall. It was already silent, completely gone.

"Can't get in! According to my vague memory back then, the time to look around this month does not last long, that is, it is estimated that it will take more time to blink an eye! There must be some great secret in this, but it doesn't mean that we can leave. Maybe even once we go in, we may not come out again. Probably noticing the disappearance of the stone wall, Professor Hu spat out a wry smile one after another.

"Enter!" Originally, there were still some concerns, but after the stone wall disappeared, the moment Zhang Yang looked at the entrance of the cave, a call that seemed to be in the dark could not be suppressed and pounced on Zhang Yang's heart. Driven by that feeling, Zhang Yang couldn't help but walk towards the entrance of the cave.

"Publicity!" , subconsciously pulled Zhang Yang, although there was a faint contradiction with Zhang Yang, and even Zhang Yang ate such a large piece of tofu. But at this time, maybe it was intuition, maybe it was the reason for the bottom of her heart, looking at the dark hole, Xue Li couldn't help but feel a little worried in her heart.

was pulled by Xue Li, and Zhang Yangden was stunned. Frowning, he looked towards Xue Li, and when he saw that Xue Li's eyes were obviously full of heartfelt worry, Zhang raised his eyebrows and stretched slightly. Although I didn't treat Xue Li very much, I thought that the two had that kind of relationship after all. Compared with Professor Bi Renhu and the others, Zhang Yang is still more at ease with Xue Li.

Whether it is because of the situation at this time or out of feelings, Zhang Yang still hopes that Xue Li can stand on his side. After hesitating for a moment, Zhang Yang tentatively stretched out his left hand and pulled it towards Xue Li's right hand: "I must enter!" (To be continued.) )