Truth be told, who wouldn't be excited to see a silver ingot? A few of us are no exception, and if there is a treasure here, it will be a great bonus.

When I bent down to pick up a silver ingot, and wanted to straighten up, suddenly somehow, I only felt that my legs were weak, and I knelt on the ground, only to feel weak, my head was dizzy, and my consciousness became more and more blurred.

When I woke up again, I felt that I was already lying on the wet ground, and by the afterglow of the flashlight placed next to me, I vaguely felt that Sister Li was lying next to me, while Xiao Lei was half-sitting on the ground, panting heavily, only Du Hongmei was relatively normal, kneeling next to me and Sister Li, observing our reactions. I felt my head ache like it was cracking, what the hell was going on?

After about ten minutes, the headache gradually subsided, and I struggled to stand up, because lying on the wet ground, it was really uncomfortable, but when I stood up, my head was still a little dizzy. Sister Li, with Du Hongmei's support, also stood up straight with a little difficulty.

Du Hongmei hurriedly let us take a few steps to the heights, the night breeze blew gently, I just felt refreshed, I don't know why, just now it was like taking ecstasy, and I collapsed on the ground unconsciously, if it weren't for Xiao Lei and Hongmei, Sister Li and the two of us would probably become one of the bones in the pile.

But what's going on here?

Before Sister Li and I could ask, I heard Xiao Lei let out a long sigh and said, "Today is really dangerous, the lives of a few of us are almost explained here." ”

After some inquiries between me and Sister Li, I figured out what had just happened.

It turned out that when we arrived at the pile of bones, Du Hongmei was hanging from a branch because of the bag on her back, and the strap slipped off one shoulder. So she stopped and tidied up, and as soon as she stopped, she fell more than ten meters behind us, but in the dark, she could still know the direction we were traveling according to the sound, because she was afraid of startling the grass and snakes, and she didn't shout at us to wait for her. And the three of us, who didn't pay much attention at the time, thought she was right behind us.

And that's what happened when we were about to get to the pile of bones.

The pile of bones was a funnel-shaped low-lying place, and when the three of us went down, we didn't notice anything out of the ordinary.

But Du Hongmei, who was behind us, was just about to descend to the low-lying place when she suddenly smelled a strange smell to which she was sensitive as a doctor: the smell of sulphur dioxide. The reason why she is so sensitive to this smell is related to her profession.

Because she had been on duty in the emergency room for two years, she had encountered many cases of suffocation in the cellar or mine, which was one of the very common cases, and she had been exposed to many cases of this kind, so she knew more about this condition, and as soon as she smelled this smell, she immediately knew that this low-lying place was full of sulfur dioxide and carbon dioxide, and the situation was very dangerous, so she didn't care about anything else, and hurriedly shouted for us to go up, but it was still a little late, and Sister Li and I had already had very strict symptoms of poisoning.

Xiao Lei also felt that something was wrong after he was dizzy, but after all, he was a special soldier with extremely strict training, and his physique was much better than me and Sister Li, so he was not as paralyzed as the two of us, and Du Hongmei shouted, and immediately knew our situation, so he immediately held his breath, shook his spirits, and desperately dragged me and Sister Li up.

And when Xiao Lei was in the special forces, just like the Navy SEALs in the United States, he was trained to hold his breath underwater, and he could hold his breath underwater for five minutes at the longest time, which is unimaginable to ordinary people. It is this outstanding ability and physique that not only saved him, but also saved Sister Li and the two of us.

After we got out of this danger, the inconspicuous conical bone pit became the most terrible place in our minds, and we had never encountered this kind of danger in the most mysterious cave, and we didn't expect to almost die in such an inconspicuous small pit - just as Xiao Lei sighed. So, what seems to be the least dangerous is sometimes more dangerous.

Du Hongmei took a look at the topography and topography here, and found that because of the special geographical location, this not deep cone-shaped pit is the easiest to accumulate suffocating inert gases, the density of these gases is often greater than air, so it will be very easy to accumulate in this relatively low-lying place, and when the corpses in the bone pit are decomposed, it is easier to consume oxygen, making the oxygen in the pit thinner, and it can also produce sulfur dioxide, which is more dangerous to the human body. All these factors caused us to quickly develop symptoms of poisoning as soon as we arrived in the pit. This is simply a natural "gas pit", and I don't know if the corpses in those pits died of gas poisoning and suffocation.

When we set off, we all felt that this trip was very dangerous, but I never expected that the danger encountered was this, just now because of the urgency of the situation, and shouted loudly, and turned on the flashlight and the like, even if the blind man still has that monster, I am afraid that he has already been alert, or has been transferred, or has been prepared. If we continue to search, we will become very passive, there is no way, let's withdraw, the first operation, it ended in this way, it is really unexpected.

We returned to the place where we had landed in the valley, and we shone it with a flashlight, and found that the rope was still there, and our hearts were a little more steady. Because of the special topography of the valley, it can be said that the rope is the most important tool for entering the valley - it is used when you come and even more so when you go out. If you don't have a rope, you can't get out, and because it's in the mountains, your phone has no signal at all, and it's completely impossible to get through your phone and contact the outside world.

In the dark, it is more difficult and dangerous to climb up the rope than to descend down. From the cliff above to the bottom of the valley, it is forty or fifty meters, and although the cliffs are not all steep walls of 90 degrees, the most gentle part is estimated to be 70 or 80 degrees. Therefore, the rope is the only security guarantee.

This time I went up, or Xiao Lei asked him to climb first, and I couldn't help but admire him secretly in my heart, because whether it was the first to land down the rope or the first to climb up along the rope, in both cases, it was the most dangerous - when the first one came down, there was no one below to guard you in advance, so the risk of being attacked was the greatest; In the same way, when you are the first to climb up, there is no one on it who can check that the rope is strong for you, and take care of the rope for you to prevent anyone from plotting against you.

I could feel that Xiao Lei was relaxed when he didn't come down this time, and by the light of the flashlight, I saw him take out some things from the backpack behind him - a very special small hammer, another bundle of rope, and some iron drill-like things, and at the end of each iron drill, there is a ring. Sister Li and I didn't quite understand why he was preparing these things, but seeing that he was a little nervous and strict, we didn't ask much.

But I can feel that Du Hongmei, who was standing next to me, looked at these equipment, nodded at Xiao Lei as if she admired them, and said thoughtlessly: "Xiao Lei, I have to admire you, or you think thoughtfully."

As soon as Xiao Lei heard Du Hongmei praise him, he raised his head a little embarrassed and smiled a little shyly at Hongmei. This made Sister Li and I next to me feel like the two of them were playing dumb riddles.

Next, Xiao Lei came to the hanging rope and pulled it vigorously with his hand, which was to test whether the rope was loose, and then let us extinguish the flashlight, which was mainly to let the eyes adapt to the dark light. After thinking it was okay, he took a deep breath and grabbed the rope to climb up.

Whenever he climbed a distance of four or five meters, he would take out a hammer, use the hammer to deeply insert the special iron drill into the crack in the stone, and then use another bundle of rope to pass through the round hole at the end of the iron drill, and then put the rope around his waist with a special buckle.

At this time, Sister Li and I realized that he had used another rope to make additional insurance, in case the rope we used to land slipped on it, he also had an extra rope as protection, so that he would not fall off the cliff. But our rope, which was obviously tied to a big tree on the cliff, and had been circled several times and tied with several knots, how could it slip off?

But there is nothing wrong with being careful, multiple security measures, after all, the heart is steady.

In this way, Xiao Lei climbed up and made fulcrums one by one with iron chisels on the mountain wall, and then each such fulcrum was passed through with a rope.

Because it's too dark at night,