I told Yang Xue about the ultra-deep drilling in Kola in the former Soviet Union, and I said that the bottomless abyss could be an ultra-deep drilling well leading to the mantle and even the core of the earth? We all know that the earth's gold reserves are about 4.8 billion tons, but up to 4.7 billion tons of gold ore are buried deep in the core and mantle, and less than 100 million tons of ore are scattered around the earth's crust.

Imagine that such a large gold reserves, once obtained by any country, is very likely to cause huge fluctuations in the global economy, if any country has mastered the technology of mining mantle and core gold mines, secretly operated, wouldn't it be able to quickly become the world's largest economy, control the world's economic lifeline?

Yang Xue interrupted me and said:

"Not to mention whether there is a prehistoric civilization, even according to the current state-of-the-art drilling technology, even the earth's crust cannot be crossed, let alone the development of the mantle and the gold resources of the earth's core, this is all a fantasy, as for the bottomless abyss below that palace, what do we know about it? Maybe it's just a crater left by a meteorite hitting the Earth, and we can't guess it at all. Pen ~ Fun ~ Pavilion www.biquge.info"

I say:

"If, as you say, it is just a crater left over from ancient times, then if it has enough depth to reach the mantle, wouldn't humans be able to use this crater to exploit the rich mineral resources of the earth's interior?"

Yang Xue said that this possibility cannot be ruled out, but what does that bottomless abyss mean for cavemen? Why did they build the palace on top of that sinkhole? Where did they get the stone bones from prehistoric humans, and why did they worship them?

These mysteries are trapped in our minds, and no matter how hard we rack our brains, we can't guess. Under my discussion with Yang Xue, a few hours passed quickly, and we were trapped in this air chamber, the limited oxygen was slowly running out, and we couldn't help but panic as we saw that we were getting closer and closer to death. Knowing this, it is better to let the deadly black smoke poison it, at least it will be happy, and now that I am trapped here, I can't die for a while and a half, this kind of torment, people who have not experienced it, are unimaginable.

In order to break the atmosphere of despair before I died, I found a topic and said to Yang Xue:

"What kind of method did this girl use to summon the white giant monster under the water, I have seen dogs and monkeys, I have seen circus domestication of lions and tigers, and I have watched dolphin shows in the zoo, can those white giant salamanders under the water also be trained into domestic animals that can be sent by humans through some methods?"

Yang Xue said that there is nothing strange about this, those white salamanders have exactly the same reflection in their eyes as cavemen, and if I guess correctly, they should also have extremely high IQs, and may have been loyal friends of cavemen for thousands of years, just like the dogs of the outside world. Moreover, the pigment of their skin has degenerated, and they should have lived in the nearby waters for a long time, and it is not known what the cavemen domesticated them for?

I said maybe it's for fishing, do you know that there is a bird in the Li River in Guangxi, called the cormorant, this bird is good at diving, often domesticated for fishing, the owner usually ties a rope around their necks, and after the cormorant catches the fish, it can be forcibly spit out. Therefore, this bird is often called "osprey" or "black ghost", which is very practical. I think that the white salamanders, perhaps similar to cormorants, have small teeth, cannot chew, and generally swallow their food, and perhaps the cavemen have mastered some kind of emetic method that allows them to spit out the food they have swallowed for their own use. But how can they be so big? If it's because they've been living in the nearby waters for a long time, and they're affected by some kind of magnetic force, then what about the black giant salamander we found in the underground lake?

Yang Xuedao:

"I don't think it's due to radiation, because if it's due to the mutation of organisms caused by radiation, then how can some other creatures living in this cave not have a huge size? In my opinion, it should be a factor of bloodline, we all know that human eyes will reflect red light, for example, in photos, there are often red eyes that reflect light sources, but this ability of humans is not as strong as that of animals such as cats and dogs, so it is generally not visible. However, these cavemen are different, they have lived in a dark environment for a long time, although they can also obtain fire, using animal fat to make torches, but after all, the environment is dark, after dozens of generations of evolution, maybe mutated and gained night vision, so, bat people and white giant salamanders, as well as those cave rats whose eyes can also reflect red light, do they have caveman blood? Or, could these creatures all be made by them? ”

Yang Xue and I were fascinated, and I didn't pay attention to what the girl next to me was doing, and thought that she had been squatting there and crying secretly, but at this time, my shoulder was suddenly patted by her, and I turned around in surprise, the girl looked at me with a look of surprise, and pointed to the water eye in the center of the air chamber a little eagerly, and suddenly clumsily squeezed out a word from her mouth:

"Water ......"

"Can you talk!?"

Yang Xue and I were shocked by the girl's sudden opening, listening to the girl's accent, although it was very unfamiliar, like a dialect somewhere in the southwest, but the word "water", I heard it so well that the whole person was so surprised that he almost dropped his jaw, and subconsciously yelled at the girl:

"Do you understand us?"

The girl was very strange, and pulled my clothes again, pointed to the watery eyes, opened her mouth slightly, and squeezed out a word from her throat again:

"Water ......"

"There's something underwater!"

Yang Xue immediately screamed, and before I could see it clearly, she plopped and dived into the water, and in the blink of an eye, she came out again, and a corpse was dragged out of the water!

When I saw this corpse, it was very familiar, wasn't this the corpse of the yellow fat man?

It turned out that after the yellow fat man was killed in the water, he had been floating in the underground dark river, and because the river was flowing very slowly, it was only at this time that he passed through the undercurrent and reached the location of the air chamber where we were. This yellow fat man was wearing a diving suit, but above the neck, the entire head was already black and rotten, and the hand that had touched the white snake before was so rotten that only bones remained, which looked creepy. Perhaps, he died in the water, not because of a diving failure, but because of a snake venom attack, no wonder even those carnivorous giant salamanders did not dare to touch his corpse.

When I saw that the fat man Huang was carrying two oxygen cylinders on his back, I was immediately ecstatic, and I was busy asking Yang Xue to unload the oxygen cylinders and see the oxygen content. Yang Xue was also quite excited, and she didn't care about the tragic death of the fat man, so she quickly checked the content of the oxygen cylinder, and said to me excitedly:

"There's still a third of them!"

None of us thought that he was about to die in this air chamber, but suddenly got the oxygen cylinder of the yellow fat man, could it be that this guy turned into a ghost after death because I saved his life, and came to repay the favor? However, Yang Xue and I were only discussing just now, and we didn't pay attention to the water eye at all, if it weren't for this girl's reminder, we would have missed this only opportunity.

Although only one-third of the oxygen content of the two oxygen tanks remained, the three of us could still dive underwater for a considerable distance, and if the girl could summon the white salamanders that looked like underwater speedboats again, then we would have a better chance of getting out alive.

Yang Xue and I worked together to carry the body of the fat man on this air chamber, and Yang Xue began to try to take off his diving suit and put it on the girl, I hurriedly stopped her and said, don't take this risk, maybe his diving suit is also stained with that kind of deadly snake venom. Yang Xue pulled it twice, then took her hand away, shrugged her shoulders, and said to me:

"Well, then, give this girl your wetsuit."

I was taken aback, thinking that Yang Xue was joking, although this girl was going to share an oxygen cylinder with us and go out together, she had already adapted to the low temperature of the cave, and the chance of hypothermia was relatively small. I was covered in injuries, if I didn't have a wetsuit underwater, I would probably lose my body temperature in a short time, Yang Xue couldn't have known this, why did she ask me to take off my wetsuit? Could it be that she didn't even care about my life or death for the sake of this cave-dwelling girl?

Just when I was surprised, Yang Xue suddenly stood up and hugged my back, hugged me, put her lips next to my ear, and said in a trembling voice:

"If you can't get out, do you have any unfulfilled wishes?"

I was inexplicable, but listening to the voice, Yang Xue seemed to be about to cry, not like a joke at all, I instinctively reacted and asked her:

"What do you mean by that?"

But I heard her whisper in my ear while sobbing:

"Meaning...... I can't take you out......"