Xiaobai pulled me, with a look of horror on his face. Seeing that I didn't fall, he let out a long sigh of relief. Less than half a meter in front of me, there was a cliff. A sound that almost resonated with my heartbeat came from the cliff.

came from the depths of the cave. The sound we heard before came from here. Xiaobai obviously discovered it before me. I couldn't help but take a step back and swallowed. I felt my legs trembling a little.

, Xiaobai pulled me and complained: "Lao Du, what happened to you just now? You scared me to death! What kind of fox? Are you hallucinating? There is no fur here, how can there be a fox!"

I swallowed my saliva and took a long time to calm down. When I heard Xiaobai's familiar voice, I suddenly came to my senses. Maybe it was like what Xiaobai said. I had indeed hallucinated just now. This huge bottomless thing in front of me

The sound from the abyss can resonate with the heartbeat, which may be the cause of my hallucination. The scene just now is the scene that my subconscious is most afraid of seeing.

Fortunately, Xiaobai was holding me beside me, otherwise, I might have already stepped into the bottomless abyss in front of me.

I held up my flashlight and shined a light into the abyss. The light was instantly swallowed up by the darkness. I took a breath of cold air. The area of ​​​​the abyss was probably larger than I imagined. The light could hardly spread here. It was simply

A black hole that can swallow even light.

The bursts of sound coming from the abyss are like the screams from hell. People with weak minds can easily lose themselves in such sounds.

This seems to be a dead end.

Xiaobai smacked his mouth, hesitated for a while and said: "Lao Du, what the hell is this place? Why is there such a big hole? Could it be some secret base of the country?"

I shook my head: "There are no signs of artificial digging here, it should be a natural sinkhole!"

Xiaobai was a little disappointed and said: "Didn't you say there is a way out here? It's better now. There is a way out instead of a dead end!"

I was also very disappointed. I originally thought the exit was just ahead, but unexpectedly I encountered a bottomless sinkhole. All my previous inferences were overturned, and my mind was in a mess. I didn’t know what to do!

I held up a flashlight and walked around the abyss for a while. I found that I couldn't find the end. The pit was so big that I had to give up the idea of ​​going around it.

Xiaobai said anxiously: "How about we go back the way we came from? If we try hard, there might be a glimmer of hope!"

I thought about it and felt that the possibility of us going out was very small. The space here was huge. According to my guess, it might be a trumpet hole. We were located at the outermost end of the trumpet hole. There were no reference objects around us. There was no way we could

We can't identify the direction. After all, it's all directions, which means there are roads everywhere. The probability of walking back to the entrance of the cave is almost zero. We came out just now and were guided by the sound at the bottom of the cave. It will be difficult to go back!

Seeing that I was silent, Xiaobai complained: "Okay, why don't you say something! I don't want to be a mummy here!"

I was also at a loss and didn’t know how to answer.

Seeing that I couldn't say anything, Xiaobai groaned, found a piece of gravel from the side, held it up to the edge of the cliff, and suddenly threw the gravel into the bottomless abyss, which was as big as a watermelon.

The stone immediately sank into the darkness. After a long time, there was still no sound. Xiaobai and I were both a little disappointed. It seemed that the abyss was really bottomless.

Xiaobai sighed: "I didn't expect that there is such a place in the world. If we can go out! This discovery will definitely shock the world! Such a large underground sinkhole is really unheard of! Then we will visit this place again

I’m contracted to build a sling and a lift here! We’ll definitely make a lot of money!”

As Xiaobai talked, he actually laughed.

I snorted: "You are quite good at dreaming!"

Xiaobai was dissatisfied and said: "You are having fun in the midst of suffering! You have no idea. There is no way to go back, and there is no way forward! What should I do? I can only wait to die!"

Before Xiaobai finished speaking, a sudden idea came to my mind. I held up a flashlight and asked Xiaobai, "Where did you move the stone just now?"

Xiaobai covered his eyes with his hands and cursed: "Take the damn flashlight away, I'm almost blinded. Why are you asking? It's right behind you! What can a few rotten rocks do?"

!”

I immediately held up a flashlight and looked behind me. Sure enough, there was a pile of rubble. In fact, since I came in before, I found that this cave is very clean and inaccessible. The cave is naturally formed. Although there are some pits and pits, there is no exposed stone. Why?

Will there be a pile of gravel on the cliff?

Xiaobai was also curious about what I was doing. He followed behind and surrounded me. Xiaobai looked at the pile of rubble with a puzzled look on his face: "I said, Lao Du, what are you doing so nervously? A pile of rubble.

What’s there to see in the pile of rocks!”

I turned to Xiaobai and asked, "Think about it, have I seen any stones along the way? Are they all clean?"

Xiaobai thought for a while, nodded and said, "What does that mean?"

I smiled and continued: "This cave is not that big, and there is not even a single piece of gravel. It is only found here. Don't you think it's strange?"

Xiaobai frowned, nodded and said: "It's a little strange! Hey, I said Lao Du, what time is it now? Don't be pretentious and tell me quickly, what did you find?"

I turned around and looked at it carefully with my flashlight: "I guess this pile of rubble may be man-made!"

Xiaobai was a little surprised and said in surprise: "You mean, besides the two of us, there are other people here? This is impossible! How come I didn't see a single human hair!"

I shook my head and said: "When I say there are people, I don't mean there are people now. I mean, there are people here before, but maybe they left this pile of rubble before!"

Xiaobai curled his lips: "You know this has a bird's use. Someone came here hundreds of years ago. What does it matter now? Besides, isn't there a mummy at the entrance of the cave? You know this has a hair's use!"

I ignored Xiaobai and took a closer look with my flashlight. What Xiaobai said made sense, but I felt it was not that simple here. This pair of gravels was about the size of a pile of corns, and they were all of different sizes.

I picked up a piece of gravel and looked at it carefully with a flashlight. The gravel had different shapes and rounded corners. It was not like air-dried gravel. The corners of air-dried gravel are sharper, and this

The gravel is different. If you look carefully, you can see that there are deep gouges on the sides of the gravel. I took a few more pieces and looked at them. I found that there were gouges of different lengths and depths on them. This shows that these gravels have different depths.

The stones were all chiselled from a large stone with tools. I guessed it right.

Seeing my high spirits, Xiaobai became somewhat interested. He came over and patted me on the shoulder and asked, "Have you discovered anything?"

I stood up and took a look with my flashlight, then turned to Xiaobai and said, "What do you see above?"

Xiaobai was a little confused. He looked in the direction of the light of my flashlight and asked in confusion: "A pile of stones? Can you speak properly?"

I saw that Xiaobai was anxious. I smiled and said, "If you are afraid of going up, take off the top stone and take a look!"

Xiaobai saw that I was full of confidence. Although he didn't know what medicine I was selling in the gourd, he still followed the instructions. He rolled up his sleeves and climbed up. The pile of rocks was only two or three meters high, but Xiaobai's legs and feet were not good.

It was a bit difficult to get up.

I sighed, pulled Xiaobai down and said, "I'll do it. With your legs and feet, I won't have the strength to carry you if you fall!"

Xiaobai laughed and scolded: "I guess you still have some conscience!"

I climbed to the top of the pile of stones. The stones were piled quite solidly. I stood on them and stamped my feet. It was quite stable. I peeled off the top stones to reveal a neat stone in the middle.

I was overjoyed, as I guessed, there was something inside. I just saw that this stone was chiseled by craftsmen, so I guessed that there was something here, and the stone at the top was completely different from the surrounding ones.
Chapter completed!