Wen Qingshan continued: "Generally speaking, it is still possible to search for satellite signals within a few meters of the satellite locator search, but if it is too deep, there is no way. Therefore, it is unlikely that they were buried by quicksand because in that case, they should still be able to search for signals from the satellite positioning device they carried, so I guess it is very likely that they accidentally entered an underground cave while avoiding the sandstorm. ”

Hearing Wen Qingshan say this, I said suspiciously: "However, if they only entered an underground cave, why haven't they been able to get out of that cave after four or five days?" ”

"I've thought about that, and I think the biggest possibility is that the entrance to the cave disappeared shortly after they entered the cave."

"What!? You mean the entrance is gone? "I thought I had misheard, because I couldn't have imagined that an entrance that had been a zài would disappear for no apparent reason.

Wen Qingshan nodded.

"How is this possible, unless they have entered a Void Enchantment, or entered a so-called space-time tunnel."

Wen Qingshan waved his hand and said, "No! This cave should have nothing to do with the Void Enchantment, but a real cave. ”

"Since it is a real cave, how can the entrance disappear?"

Wen Qingshan explained: "You don't know, in the desert, the sand dunes will be displaced under the action of the wind, which will change the terrain and environment in the desert to a certain extent, which is one of the reasons why some people have obviously found an ancient city ruins in a desert, but when they look for it again, they can't find it anyway." So I think it must have been the sandstorm that displaced the sand dunes in that area, so that the entrance to an underground cave that was originally buried under the sand dunes was revealed, and they hid in that cave to avoid the sandstorm, but they didn't think that the sand dunes moved again, burying the cave entrance. ”

As soon as Wen Qingshan said this, Ai Shan happened to pass by the door, Wen Qingshan saw him and hurriedly shouted at him: "Brother Aishan!" Please wait a moment. ”

Ai Shan stopped and asked in slightly stiff Mandarin, "Is there something wrong?" ”

Wen Qingshan said with a smile: "I heard that the Aishan brothers are most familiar with the terrain of Lop Nur, I want to ask, do you know if there is an underground cave under Lop Nur?" ”

When Ai Shan heard this, he immediately nodded and said, "Of course!" There are not only underground caves under Lop Nur, but also a very huge underground lake! ”

"Underground Lake!?" Aishan's answer surprised us all.

Ai Shan continued: "When I was a child, I heard from the old people in the village that there was a huge underground lake under Lop Nur, I didn't believe it before, but once, I was alone in the hinterland of Lop Nur and encountered a strong sandstorm, lost my way, and drank all the water, just when I thought I was dead, I suddenly found a pool of clear water in a sand dune depression, at first I thought it was a mirage, but after approaching, I saw clearly, it was really a pool of clear water. It was only by that puddle of clear water that I was able to come out of the hinterland of Lop Nur alive. Since then, I have believed that there is indeed an underground lake under Lop Nur, and that as the dunes change, some low-lying areas will seep out groundwater, creating pools. ”

After listening to Ai Shan's story, Wen Qingshan seemed to think of something, frowned and muttered: "There is such a thing, is it true that the theory about Lop Nur Wandering Lake?" ”

I hurriedly asked, "What is a Wandering Lake?" ”

Wen Qingshan explained: "Because the drying up of Lop Nur has always been difficult to explain from a scientific point of view, the Swedish expedition is Sven? In the 80s of the 20th century, Hedin put forward a set of theories about the migration of Lop Nur, he believed that Lop Nur exists in the north and south of the two lake areas, because the water into the lake carries a large amount of sediment, after sedimentation, the lake bottom is raised, and the original lake water will naturally flow to another lower place, and after many years, the raised lake bottom will be lowered again due to wind erosion, and the lake water will flow back again, this cycle is 1500 years. This theory was widely accepted, and then some people put forward a new view based on this theory, arguing that Lop Nur has two lakes, one yin and one yang, and that Yang Lake is the former water area of Zeguo, while Yin Lake is located underground, and with the change of yin and yang, the area of the lake will also change. ”

"In other words, Lop Nur has not dried up, but the water has just sunk to the ground."

"According to the theory of migratory lakes, so to speak."

Wen Qingshan's words made Dong Xiaodan seem to see a glimmer of hope, and she said with some excitement: "If that's the case, could it be that my dad and they just entered the cave where the underground lake is located!?" ”

"It's hard to say now, after all, it's just a theoretical analysis, but if there is really an underground lake under Lop Nur, then their chances of survival will be greatly improved."

A few of us were talking, and suddenly we heard a noise outside the door, which sounded like the sound of an iron door opening, and we hurriedly walked out of the door, and sure enough, the heavy iron door was slowly opening.

When the door was fully opened, I saw Long Yi and Chen Biao standing at the door.

They had just gone to a meeting, and now that they had returned, they didn't know what news they had brought.

A few of us immediately stepped forward, and Dong Xiaodan was the first to ask, "How about it, can we set off to search now?" ”

Long nodded: "Everyone hurry up and prepare, the vehicle will come to pick us up in five minutes." ”

"Holy! Just five minutes!? "I felt a little uncomfortable with such a tight schedule, but I couldn't help it, I could only obey, I couldn't care so much, and hurried back to my room to change clothes.

Five minutes later, I hurriedly walked out of the room with my backpack on my back, and found that the twenty members of the Red Dragon Operatives had already been assembled, and they were truly well-trained elite fighters.

Everyone else also walked out of their respective rooms one after another, including Dong Xiaodan who also had a big backpack on his back, and as soon as Long saw her, he immediately stepped forward to stop her: "Miss Dong, you can't go with us." ”

"It's all here, so let me go with you. You let me stay alone in this dark place, how can I stay there! Dong Xiaodan pleaded.

Long Yi said in a non-negotiable tone: "No! We've already said it, you stay here and wait for news! ”

As she was talking, several desert jeeps stopped outside the gate, Dong Xiaodan saw this, didn't say a word, and immediately walked out with her backpack, her posture seemed to be planning to overlord the bow. And Long Yi didn't stop her, but said in a calm tone: "Miss Dong, if you insist on going, this search and rescue operation may be delayed or even canceled because of this, in order to find them as much as possible, I advise you to be able to obey the arrangement." ”

Long Yi's words shocked Dong Xiaodan all of a sudden, she stopped, turned her head to look at Long Yi, and then looked at me, tears seemed to roll in her eyes.

I knew that she was worried about Professor Dong's safety, but after all, this was an arrangement that had already been decided, and it was probably not Long Yi who could do it, so I hurriedly stepped forward to comfort her and said, "Don't worry, there is still me!" I'll find Uncle Dong and theirs. ”

Dong Xiaodan raised his head and looked at me: "No matter what, you must find my father." ”

I nodded firmly, looking at her trusting gaze, and suddenly felt an inescapable sense of responsibility in my heart.

The group got into the jeep, and the convoy drove along the passage to the ground, and after driving out of the base, the convoy drove directly into the vast desert.

At this time, it was noon, the four-wheel drive desert jeep we were riding, full of power, but the comfort was very general, there was no air conditioning, the windows were all open, I found that the desert was really not generally hot, a heat wave hit, I only felt that the sweat kept rising, as if the throat was about to burst out of the eyes, I had to keep drinking water to quench my thirst. However, the air quality is very good, and the visibility is very good, even from the sand dunes far away.

The convoy is speeding in the desert, because there is no way to follow, can only rely on the satellite navigation system to guide the direction, Wen Qingshan and I followed Long Yi and Batur, Aishan sat on the same car, on the way, Aishan introduced us to the situation of Lop Nur, he told us, the climate in the area of Lop Nur is unpredictable, sandstorms are coming, even if there is no wind now, the weather seems to be good, but it does not mean that it is safe, once the wind rises, you must be careful, because the surrounding is too empty, a light wind may evolve into a storm. When a sandstorm comes, you must stop immediately and find a way to shelter from the wind, but remember not to hide in low-lying areas, otherwise there is a risk of being buried by the moving sand dunes.

In addition, special attention should be paid to the temperature difference between day and night, because the desert is dry and water-deficient, coupled with the lack of vegetation, the intensity of sunlight during the day is very high, and the dry sand and gravel absorb heat much faster than in water-rich areas, and at night, due to the lack of sunlight, the heat will be released quickly, and the temperature will drop rapidly. In Lop Nur, the maximum temperature on the ground during the day can reach 70 degrees, burying a raw egg in the sand will turn into a mature egg in less than two minutes, and after the sun sets, the temperature will drop below 10 degrees in a very short time, and the temperature difference of up to 50 degrees may make it difficult for the human body to adapt.

After listening to Aishan's words, I couldn't help but secretly say that it was not good, because when I came the day before yesterday, I was in a hurry, and I didn't bring any thick clothes at all, and I didn't know if I could endure it at night.

Ryuichi, who was sitting in the passenger seat, seemed to know that we were not well prepared, so he turned his head and said, "You don't have to worry, the car not only has enough food and water, but also warm clothes. ”

Hearing him say this made me feel a little more relieved.