In this regard, Song Siyuan shook her head and explained: "This kind of desert swamp is often accompanied by quicksand, as long as people accidentally step into it, it is difficult to escape, according to the distribution of these ponds, almost all over the west bank of the Hotan River, it is difficult for us to completely avoid these ponds when we walk."

After a pause, she continued, "But the fact that we didn't feel like we were being pulled into the mud or swamp when we were looking for the ruins means that when it doesn't rain, these desert pools are completely dry, just like the sand layer, and only after the appearance of water does it accumulate rainwater and form pools."

"If there were swamps, the water in these ponds would have been sucked into the swamp long ago, and it would not have formed a reservoir, and it would be impractical to have a swamp under the sand."

Gu Xixi listened to the words of a few people, his eyes flashed suddenly, and he took a long breath and reminded: "Is it possible that there are still some peaks under the hinterland of the desert, but it is only because the sand directly covers the peaks that the whole area has become a flat desert."

At this point, Gu Xixi had obviously encountered similar terrain before, and said seriously: "I have also seen this kind of terrain in northern Xinjiang, and I remember that we once found a canyon in the sand in the desert of northern Xinjiang."

The so-called canyon in the sand is completely different from the normal canyon, which is mostly concentrated in the mountains or river valleys, while the desert canyon appears on the flat sandy land, with the horizon as the highest point, and cuts deep into the desert underground.

Normally, you can only see the flat sandy land, without any shadow of the canyon at all, and only under the abundant rain can you see the entire canyon hundreds of meters deep, washed by the abundant water, appearing on the sand.

If you want to use an analogy, these sandy canyons are like splitting a crack directly along the sand, and you can see underground rivers rushing under the canyons, and even the sand on both sides of the canyon will form sand waterfalls under the height difference, constantly falling into the abyss and rushing into the underground river.

This kind of canyon is a desert canyon!

Tracing back to their origins, these canyons were actually cracks in the rock formations produced by geological movements in ancient times, and then over thousands of years, these rock formations were gradually covered by deserts, forming completely flat sandy land.

When the groundwater is not abundant, the sand will completely fill the canyon gaps, you can't see how deep the rock cracks are, even if you walk on the canyon, there will be no danger, only wait for the groundwater to rainfall, the magic of the canyon will be revealed!

When the rainy season arrives, excess groundwater collects through underground channels, which have the power to alter the structure of the subsurface and can continue to scour the cracks in the rock formations, and may even open up new cracks in the rock formations to form underground rivers.

Under the powerful force of this flowing water, the sand is completely unstoppable, and the excess groundwater will continue to wash away the crevices of the rock formations that remain deep in the desert, and finally wash away the quicksand completely.

Then, the gaps that were originally filled in were gradually exposed from the flat desert after not being filled with sand, and if you don't know the situation, you will feel that a huge canyon has appeared out of thin air in the desert, and these rock cracks are like the creator has torn open the sand, and you can directly see the underground river through the sand layer.

When the flood season passes, the amount of water decreases, and the underground rock formation will gradually stop flowing, and the power to wash away the sand will completely disappear, and the sand on both sides of the rock layer will continue to fall into the gap under the height difference, as if the soil is continuously filled into the gap, until the canyon is filled, and a new flat sand will be formed.

Many people who don't know the truth will call this kind of canyon that appears and disappears with the flood season as the devil's mouth, and once it appears, it will be the end of devouring living creatures and sediment.

Speaking of this, Gu Xixi was obviously not joking, explaining: "Although the characteristics of the desert canyon are different from the current situation, at least one thing can be proved - since this desert can hide the canyon, then it is very likely that any tall rock formations or simply stone mountains can be hidden, it is not our imagination."

This Hu Nu's prompt can be regarded as opening the way for everyone, Wang Yuanji seemed to remember something, and interjected: "Indeed, I suddenly remembered that a strange mountain was once recorded in Shandong's "Shouguang County Chronicles......

This mountain is called Jingshan, located in the southwest of Shouguang County more than ten miles, neither high, nor wide, not wide, the total area of the mountain stone is about the same as the water tank, the highest part of the exposed ground is half a meter, if it is calculated according to the reality, it is about the same width and height as a bench, any person with hands and feet, can stand on the top of the stone.

Such a stone pier cannot be called a mountain, and the reason why it can be called a mountain is completely for another reason.

It turns out that most of the mountain is buried in the soil layer, and this mountain shaped like a bench is actually the "peak peak" of the mountain exposed to the ground.

At this time, they realized that Jingshan is not big because most of the mountains are under the soil layer, as for how tall the volume under the soil layer is, no one has been able to completely dig out and measure it since ancient times, and it is precisely because no one knows its size and depth that it is named Jingshan!

Speaking of this, Wang Yuanzhen became serious: "The rock formations in these deserts are probably also the bodies of some mountains, which is correct with our speculation."

After hearing so much, Song Siyuan also felt that their statement was very likely, and said: "It is indeed possible that the mountains hidden in the desert are indeed possible, but why only the area on the west bank has deep rocks, and we can understand it in combination with geological logic, can it be understood that there are some geological disasters in this area on the west bank, and some mountains and rocks have appeared, and the Sand Sea King City has completely disappeared here."

Her words had already been said so clearly, everyone had already guessed the meaning of his words, and Xu Xiake's eyes lit up, "A disaster that is enough to change the rock formation, isn't that an earthquake!"

"It's an earthquake!" Xu Xiake nodded, convinced that his guess was accurate.

Song Siyuan cast an approving gaze: "Yes, I think only the earthquake can change the rock structure of the west bank, which has caused a tall rock formation to appear under the sand layer, as for the specific details, I will continue to study and study."

At the moment, they had completely left the tent, and the small blackboard and sand table were not brought out, and Song Siyuan had to use what she had in her hand to begin to analyze the impact of the earthquake on the rock formation, and at the same time, she did everything possible to guess the logic and feasibility of it.

After about an hour, she let out a long breath that seemed to have a result.

Song Siyuan calmed down, coughed a few times and said: "I think that the situation on the west bank of the Hotan River should start from the destruction of Shanshan State thousands of years ago, about a thousand years ago, the Tang army broke through the Western Regions, including the Western Regions of Ancient Shanshan, and was included in the Tang Dynasty since then. At night, the birds crash and cry blood."

Speaking of these, Song Siyuan's face became mysterious: "The two things seem to be unrelated, but they both happened in the same year, and at the same time, in the records of these two events, there are common elements, the earth shakes the mountains, and the strange celestial phenomena, from this point of view, it seems that these strange celestial phenomena have appeared because of the demise of the ancient Shanshan Kingdom."

"Combined with the geological disasters such as earthquakes that have occurred here, I have reason to judge that about the twenty-third year of Zhenguan, the destruction of the Shahai King City seems to be related to the earthquake caused by the magnetic field disorder, and I even think that whether it is the subsequent crying of birds and birds in Dunhuang City, or the appearance of the undead, these situations can be counted as a chain reaction caused by the disappearance of the Shahai King City, as if it is like dominoes, with a close logic."

"What do you mean by that?"

The crowd was very curious about this.

Song Siyuan continued, "I remember when we went to look for the geese in Yanshan, I mentioned to you that there is a structure in the minds of birds that can sense changes in the magnetic field in order to adapt to the earth's magnetic field, so as to help them find their way and migrate and settle.

"If the birds lose their direction, in addition to being chased by natural predators, there will probably only be magnetic field disorder, and I heard the birds in Dunhuang City crying blood

At that time, it was already suspected that there was something wrong with the organs that sensed the magnetic field, probably because they were affected by the magnetic field, so they could hit the body without any purpose, and they could not distinguish their direction and their temperament changed drastically, which just shows that the magnetic field in the desert has been disordered."

"Among them, the most noteworthy point is that the date of the accident is the year of Li Shimin's death, which is about the twenty-third year of Zhenguan, and it was also in the same year that the Shahai King City perished, and there was a geological disaster here that was suspected of being an earthquake, and the earthquake could be generated, which was also caused by the disturbance of the earth's internal magnetic field."

Speaking of this, Song Siyuan's eyes widened: "Think about it, the earthquake in Shahai King City, and the birds in Dunhuang City crying blood, and at the same time having an accident due to magnetic field disorder in the same year, if it is not a coincidence, it is probably deliberately done by some people."

Then, she took out the photo on the mural of the underground palace and said: "At that time, General Ashina recorded that they saw the disappearance of the Shahai Royal City, and I suspect that it was the power of Yu Pei that caused the magnetic field disorder, which caused an earthquake in this area, which not only made the royal city disappear, but also shocked foreign enemies, and the situation described by this general just proved that there was a real earthquake here at that time."

"This can also be corroborated by each other!"