The light changed slightly, and the sign was restored to its original shape.Chen Yu wanted to find that specific angle again. Holding the crystal lantern, the sign began to slowly rotate again.

When Chen Yu felt that his hand holding the crystal lantern was almost numb, the sign stopped rotating slowly, and changed from horizontal to vertical.

Looking at the place pointed by the new curve of the marker, Chen Yu surprisingly found a fist-sized groove on the stone wall about one meter.

The groove is very shallow and inconspicuous. If you don't look carefully, you can't find its existence.

The two of them looked closer and found that there were a few characters in the groove, very strange characters, and text like tadpoles.

Fu Xiaoxiao reminded: "Husband, write down these characters and we will write them down together."

Although I can't understand these characters, Fu Xiaoxiao thinks this may be a useful clue.

Chen Yu's brain is highly developed due to mutation and evolution, and possesses an unforgettable super memory. After a glance, he memorized a few characters as if printed in his brain.

Fu Xiaoxiao took a little time and remembered a few characters firmly.

With this surprising discovery, the two of them spent most of a day walking to the bottom of the hole. They found more than 400 grooves with characters, and recorded more than 2,000 characters.There are many repetitions of more than two thousand characters, and there are about five or six hundred different symbols.

Not only that, they also noted the order in which each groove appeared.

Those who were missing are still not found, and they no longer return without success.

"There are different things in the cave. We haven't found them yet. We will continue to look for them tomorrow." When Di Xiaoshan and Gu Youli greeted them, Chen Yu lied and explained first.

Gu Youli handed a rolled note to Chen Yu, "From the carrier pigeon."

Estimated time, it has been nearly ten hours since they released the homing pigeons at noon, which happened to be the time required for the homing pigeons to fly back and forth.

Needless to read, Chen Yu also guessed that it must be Ye Chunfang's reply after reading their Flying Pigeon Biography.

I thought Ye Chunfang would have any special ideas and gave them special tips, but unexpectedly there were only four words on the note, come back to pick me up!

After eating something, Chen Yu instructed Di Xiaoshan and Gu Youli to stay here, and told them that they were going back to pick up Ye Chunfang. The cave was a little weird and she needed her to check the puzzle.

Fu Xiaoxiao also urged the two of them not to go down to the cave before they came back.

It was not until the early hours of the morning that Chen Yu and Fu Xiaoxiao rushed to the house and woke Ye Chunfang to explain the situation in the cave in detail.

They also wrote down the more than 2,000 characters that they had memorized in order, like a gourd drawing.

Ye Chunfang stared at the tadpole-like characters on his face and said: "It is certain that this is a kind of writing, but we can't interpret it. These words are heavenly books to us."

"It's impossible for people to disappear out of thin air. Since those small snake-like signs will rotate due to light, it means that there are other places in the cave that will also change due to light, but you haven't noticed it."

"I really can't imagine that those little snake-like marks will rotate, which is incredible and incredible." Chen Yu sighed.

Ye Chunfang glanced at Chen Yu like an idiot, "The gouge doesn't rotate, there is an inverse law of physics. You see the mark symbol changes, it's just a light and shadow effect."

Chen Yu defended: "Those gouge marks have really rotated."

Ye Chunfang smiled contemptuously and asked, "Did you touch it with your hand?"

Chen Yu thought about it seriously, shook his head slightly and said that he didn't touch it with his hands, then looked at Fu Xiaoxiao, "Have you touched it with your hands?"

Fu Xiaoxiao shook his head slightly and said: "At that time, we were only concerned about memorizing these characters. How can we feel the chisel marks."

Ye Chunfang said: "That's right, the gouge mark does not rotate at all, you see that the rotation is the light and shadow effect, you mistakenly think that the gouge mark is rotating."

Chen Yu and Fu Xiaoxiao nodded slightly at the same time and agreed with Ye Chunfang's statement. Sister Wanneng never missed it.

"Since those people brought plenty of water and food, they should be alive, but they were trapped in the cave and could not get out." Ye Chunfang said in conclusion.

Chen Yu asked, "Why are these characters in the cave? Did the aboriginal people develop faster and invent characters in that character? And, what will the cave be used for?"

Ye Chunfang mused and guessed: "Since you said that the chiseled scars are very old, it is impossible for aborigines to invent characters nearby. Once there are characters, it means that primitive society has developed more qualitatively. There It’s a long time away from Ucheng. If there were developed tribes, the tribes near Ucheng would have been assimilated or destroyed."

"If I'm not mistaken, those characters and caves should be the prehistoric civilization on this island. The use of such caves should be for tombs or for sacrificial offerings."

"Damn, prehistoric civilization, is there really a prehistoric civilization?" Chen Yu was shocked.

Ye Chunfang nodded affirmatively: "Many scientists believe that there is a prehistoric civilization. This island is so weird. It is not surprising that there is a prehistoric civilization. Also, it is possible to make full use of the light and shadow effect to carve those characters, indicating that Science is already very advanced, at least very advanced in the field of optics."

Chen Yu frowned and thought for a while, and suddenly wanted to enter the abandoned crystal mine. "If there is a prehistoric civilization on this island, then the crystal mine with obvious human traces can explain it."

"Take a rest early. Let's go and have a look tomorrow." Ye Chunfang got up and walked into the room, and said without looking back: "Sister Bai knows that you will be back tonight, so I am waiting for you in the room."

Chen Yuchong Fu Xiaoxiao smiled bitterly, and replied: "I see."

Fu Xiaoxiao whispered in Chen Yu's ear: "When I find those missing, I will accompany you to the mandarin duck bath in the nearby creek, and I will accompany Sister Bai tonight. Since Sister Wanneng said they are still alive, you too Don't worry about comforting Sister Bai."

Chen Yu took a bite on Fu Xiaoxiao's face, picked her up and left, "I'll go take a bath in your house."

"Bad guy!" Fu Xiaoxiao just whispered and did not resist.

Sister Bai knew that Chen Yu was working hard, and heard Fu Xiaoxiao's depressed cry, so she didn't embarrass him or ask him for comfort, she just hugged him and fell asleep until dawn.

The next morning, Sister Bai got up early to make breakfast. None of the other sisters went to the beach for morning exercises, waiting for Chen Yu and Fu Xiaoxiao to get up and ask about the situation.

After breakfast, Ye Chunfang handed Chen Yu a big backpack, "Bring these things."