To tell the truth, I still can understand the mood of the doctor, but his emotional thanks, but still made me a little confused.

Or Zhao Lulu cleverly, in time for me to open the fence: "Leaving the doctor, don't be in a hurry to thank you, or first see if this pit is what you are looking for!"

“All right, all right, all right!”

The doctor was still a little excited, and then took out the search photo flashlight, learned what I had just looked like, and after a while he sighed.

Looking at him like this, I subconsciously feel a little bad, is it wrong?

However, at the end of the day, I still wanted more, after the doctor sighed, but then murmured: "Such a deep pit, and near the Animaqing Mountain, I can't be wrong, that's it!"I didn't know, I didn't know it was so tightly hidden, or we found it!"

“Hearing...”

I took a breath, which changed too quickly from the doctor's mood, and I also learned to gasp...

After leaving the doctor, others also looked at the hole, and when it was time to put an iron egg, he even put his head in.I saw him this move, quickly pulled him back, so deep in the pit, what if it fell?

“Hey...” The Iron Man laughed a little silly, turned his eyes, and then asked me, “Captain, when are we going down to see it?”

When was this guy so adventurous?

I laughed bitterly and did not say a word, but Chen Nan Nan took the mouth: "Don't worry, this pit has been hidden for so long, the air quality does not know how, you wait, I will go to get the measuring instrument!" 」

After a period of time, Chen Nannan took a small air measuring instrument back to the pit, used a rope to put the measuring instrument into the pit, and pulled it up again shortly after the test.

Looking at the data on the measuring instrument, the little girl frowned and said to us: "No, the oxygen content in the pit is a little less, the carbon dioxide is a lot, and there are a small amount of toxic gases, which can't go down in a short time!"

“How long will it take?”I asked her too.

Chen Nannan looked at the measuring instrument data and paused for a moment, then said, “At least two days!”

"Well, then act in two days, and in these two days you must also hurry up to prepare and rest."The doctor took the mouth.

We have no objection to his words, since the pit has let us dig out, then there is nothing to do, these two days we have been more leisurely and comfortable.

Two days later, in the morning, we picked up our backpacks and returned to the pit.For the sake of insurance, Chen Nannan finally tested it again, and finally said: "The air is barely qualified, but this pit is too deep, and it is estimated that there is not much oxygen in two days, we can't stay in it for too long, try to come out before dark."

We have no problem, after a simple discussion has prepared a wire rope.

This rope, which is specially made from the doctor's trust, is very strong, can extend up to 300 meters at the longest, and is still mechanized, and can control the speed and depth of the descent.

Like this uncharted exploration, I was naturally the first.I hung the iron hook on the side of the rock, tugged to confirm the stability, and then put the rope around myself, grasping the searchlight slowly dropped.

Near the mouth of the pit, there are still more than 20 meters thick rock layer, through this rock channel, only to enter the pit.

Really into this pit, I initially realized how big the space here, even if the search flashlight, suddenly there is no end, the whole space gives a cold and dark feeling, if not the flashlight cut through the darkness, then I am afraid that the real black to the extent of not seeing the five fingers, black is almost a bit of palpitations!

In the dark environment, I listened to the sound of the rope extension, silent, but constantly shaking the mobile power.I couldn’t see it in the distance, and I checked the situation nearby.The pit is about ten meters wide, the ground is littered with rubble and earthen, and even in some places there are dense plants.

I have never seen these plants, strange shapes, different colors, some with black, some red and blue, but also did not see green.

In the observation, I finally fell to the ground, and there was no danger in the middle of the supremy.I took off the rope, signaled me for safety at the mouth of the hole, and then pressed the shortened switch to return the rope to the pit.

This mechanized rope, away from the doctor, they prepared two sets, but the hole is so big, safe, and one person falls at a time.And like this kind of exploration, no one wants to miss, about 20 minutes later, the remaining eight people are all around me.

A few of them were very well prepared from the doctor, and after landing, they all put on the headlights, and they still had a searchlight in their hands, and a full fourteen lights, which finally made the dark pit brighter.

Fifty meters behind us is the beginning of the pit, and from our position you can even see the fault of the rock.

After a little observation, Zhao Lulu had a question: "How was the big pit formed?"I think it seems like some of the traces of artificial excavation around, this is not the people dug up hard before, right?"

The doctor looked at it and said, "Impossible, the surrounding rock and the soil are confused, and ordinary manpower alone can't dig such a big pit, and I guess most of this place has collapsed under some natural force."

“But there are artificial traces here...”

"This is not surprising, we do not have a special instrument on hand, can not detect the formation time here, but think it will not be short."It may be that when the pit was formed early, the locals found it here and then came in to explore it, and most of the artificial traces here were left behind.”

From the doctor's guess here, there was also some confusion: "I just don't understand, since someone has explored it, why is there no news and records in history, and why do the locals hide here?"

This thing seems to be a strange thing, I thought, suddenly a flash of light in my head: "Maybe, they don't want people to find here!" 」

“Why?”

“In my opinion, there should be two reliable explanations.One is that there is a secret hidden here that cannot be made public, but the possibility of such speculation is not too great.Another possibility is that the locals at that time should have discovered something that they were afraid of, and they did not dare to disclose it at all, so they left only a map and did not leave other information to the local future generations!”

“What can be so scary?”

"I don't know, in any case, this pit exploration, I am afraid it will be very dangerous, be careful!"