None of them expected this result, Yue Guanchao was a little puzzled, and continued to ask: "What do you mean is that after the earth shook and the mountains shook, the fragments produced by the collapse of the mountain directly flooded the Sand Sea King City, and then the sand covered the rocky ruins, completely filling in the rocks, forming a flat sand on the west bank, we can't find the Sand Sea King City, because they are still buried under a certain rock formation, as long as we can't touch that rocky rock formation, there is no way to find them."

Yue Guanchao's explanation was completely reasonable, and Song Siyuan nodded at him, "You're right, the Sand Sea King City is probably under the broken Red and White Mountain bunker."

Having said that, Yue Guanchao became curious about this: "If that's the case, then do we still need to look for it? The Sand Sea King City is located at the foot of the Red and White Mountain, once the mountain collapses, the force generated by the shattering of the mountain rocks is like a trebuchet attacking the city, which is enough to completely blow up the royal city, and what we find may not be the Sand Sea King City, but a ruin that has been smashed by rubble."

"Especially since this ruin is still hidden under some rocky rock formations, it is even more impossible for us to dig it out, and furthermore, even if we find the royal city, we may not be able to enter it, and the city hidden by the desert can no longer be excavated."

Everyone already has this awareness, and everyone's hearts are filled with gloom, Song Siyuan seems to be different from their thoughts, snapping her fingers and retorting: "I have different ideas from yours, you first look at the images of the red and white mountains on the murals of the underground palace, and then look at the red and white mountains today."

Under Song Siyuan's instructions, they observed the current Red and White Divine Mountain, and combined with the photos of the murals in the underground palace, they could clearly see that the large area of Jianluan Mountain at the eastern foot of the Red and White Divine Mountain no longer existed, as if it had been completely erased from the geographical location.

Judging from the distance from the tributary river to the peak, the length of the cracked mountain is at least two or three thousand meters, and at the same time, the almost vertical slope slope above the mountain seems to prove that the mountain was directly cracked at the beginning, as if it was directly chiseled by a sky-splitting axe, and the cut mountain was directly dumped on the Sand Sea King City, rather than being broken into stones before rolling down."

"What does that mean?" Yue Erpao scratched his head, completely confused.

Song Siyuan reminded, "Such a large volume of mountains and rocks, covering the Sand Sea King City, should form a high slope or low mountain with a considerable height, but why, what they see now is flat land, or even comparable to the height of the Hotan River?"

This shows that before the collapse of the Shahai Royal City, it was likely that it collapsed under the influence of the underground cave, and the entire rock block that carried the royal city sank down in the earthquake, thus forming a huge sinkhole.

Then, the Red and White Mountains broke directly from the side of the mountain, and the huge mountain smashed down to the west bank under the pull of gravity, completely covering the sinkhole, as if a huge lid was shrouded in the sky above the sinkhole of the Sand Sea King City, and this situation also produced a unique and subtle structure - the stone dome sinkhole!

Under this structure, the stone dome is equivalent to the cover of the sky, covering the sinkhole with a fractured mountain, like a protective shell, blocking the broken stone of the mountain for the Sand Sea King City, and at the same time, the sinkhole will also carry the Sand Sea King Layer in it, no matter how many stones are broken, they can only fall on the rock layer cover, and they cannot hurt the King City under the rock layer.

After thousands of years, the sand completely covered these rock formations, which completely filled the depression formed by the sinkhole, and to some extent, it can be regarded as restoring the ground state before the geological disaster, and it is completely explainable that this sandy land can have the same horizon height as the Hotan River.

Song Siyuan was afraid that they would not be able to digest this abstract concept, so she led them into the central tent and came to the sand table.

Then, she took out two palm-sized stones, placed them around the Sand Sea King City, and covered the model of the Sand Sea King City with a piece of cardboard, and then placed many finger-sized broken stones on top of it, and began to pour sand on the cardboard gravel.

As the sand filled the cracks of the gravel on the cardboard, a flat layer of sand gradually formed on the stone, completely burying the gravel.

She motioned for the group to look at the existing structure of the Sand Sea King's City, explaining why she was doing so, "If it were more common

In colloquial terms, we can compare the sinkhole where the Sand Sea King City is located to the first floor, and then, where we are standing now, we can roughly see it as the second floor above the sinkhole."

"With the Sand Sea King City completely sinking into a sinkhole, only the second floor is exposed to the horizon, the first floor has completely sunk underground, and all the space below the second floor is covered with sand, so it is much more reasonable that we can't find the Sand Sea King City."

Her eyes lit up, and she said loudly, "After all, we are standing on the second floor, we will never be able to find something on the first floor, if we really want to find the Sand Sea King City, we must break through the broken rock under the rock formation, and only in this way can we enter the sinkhole where the Sand Sea King City is located."

At this point, her meaning is already clear: "I believe that the Sand Sea King City must exist in some sinkhole under the huge rock formation, as long as we find the way down the sinkhole, we can find the Sand Sea King City."

"Is there really such a strange structure in the world? How could the Sand Sea King City fall into the sinkhole?"

Even if Queenie is a desert herdsman, he knows the terrain of the desert very well, and he doesn't know much about this kind of structure, probably never seen this kind of geological structure that is too coincidental, this kind of coincidence, as if it was artificially designed, after he looked at the geological model given by Song Siyuan, he felt that there was a sinkhole structure under this sand layer, which was very ingenious and strange.

Song Siyuan, who has a lot of geological experience, has realized the ingenuity of this structure, explaining: "I don't know much about the specific situation, but this can also be explained, the earthquake was not caused by natural factors, but caused by the mysterious power of Yupei, and the scope of the shaking of the earth is limited to Hongbai Mountain and the west bank of the Hotan River, and the area is also where the Shahai King City is located."

"The accuracy of the earthquake and the location of the rock collapse prove that it is the result of human control, maybe Queen Shanshan has long known that there is a cavity of rock formations under the Sand Sea King City, so she launched a mysterious power to sink the entire Sand Sea King City into the sinkhole, and then the huge rock smashed down and covered the sinkhole, forming a stone firmament."

She paused, and said in a mysterious tone, "As for why there is an underground cavity under the Sand Sea King City? It should be related to the geological structure of Hongbai Mountain."

Hongbai Mountain is formed by the uplift and splitting of the Tarim Basin, these peaks do not look high, but in terms of geological structure, the uplift structure directly splits the rock layer and lifts it upward, and it is easy to form some cavities underground.

The location of the Sand Sea King City is only a few hundred meters away from the Red and White Divine Mountain, in the length of the mountain unit, these hundreds of meters are almost negligible, which is equivalent to the Sand Sea King City is built under the mountain, it is very likely that during the formation of geological structures hundreds of millions of years ago, some cavities have been formed under the ground of the Red and White Mountain, then, this also means that the Sand Sea King City is built on the underground cavities.

"This geomagnetic disturbance a thousand years ago is equivalent to using a cavity to achieve the purpose of covering the Sand Sea King City, which is completely possible."

Seeing Song Siyuan's explanation, Yue Guanchao also understood how to find the royal city in his heart: "Is it possible that as long as we find a way to enter the underground cavity, we can enter the Sand Sea Royal City?"

Song Siyuan nodded and confirmed, "Theoretically, this is the case, as for where is the passage into the underground cavity? We can roughly guess where it is in the old river channel."

"Why?"

They were all curious, urging Song Siyuan to explain the reason.

Song Siyuan nodded at them: "I also took a rough look at the location of the old river channel just now, there is no pond near the river channel at all, and the dry sand soil also makes the outline of the old river channel extremely clear, and you can clearly see a dry river channel appearing on the sand."

"If this happens, it means that there are some underground rivers under the dry river, and maybe through the underground rivers can enter the cavities."

Song Siyuan said this, they had already understood what to do, and everyone came out of their tents, and began to check the outline of its tributaries along the river, and sure enough, as she said, the west bank of the pond was full, and the outline of the old river channel was clearly displayed.

Yue Guanchao said: "Since the whole river is the same, if you want me to see it, don't look for any location, maybe where to dig down, you can find the underground river, first determine the location, and directly blast it with bamboo tube explosives, so that it is easier to dig a little."

Yue Guanchao and the others chose a place 100 meters away from the campsite, completely dug up the thick salt crust on the river, and began to dig out dry fine sand, and then stuffed the earthen explosives into the dug trench, pulled up the lead and came to the tent 100 meters away.

As everyone withdrew from the explosion range, Yue Guanchao picked up the fire fold and ignited the primer, and these artillery leads sparkled all the way, bringing the fire to the sand nest 100 meters away, only to make a loud noise, and the yellow sand and dust began to ripple 100 meters away, and even the stones in the sand were cracked a lot, forming flying sand and stones scattered dozens of meters.

When the dust settled, they walked to the sand pit, the sand layer that was more than ten meters thick had been blown away by gunpowder, and the rock layer at the bottom had been exposed.

Yue Guanchao they go down to the rock layer, the rock layer under the river is like the edge of the rock layer produced by the squeezing of two mountains, you can clearly see that there are countless gaps in the rock layer, which are distributed in a streamlined manner within the scope of the river channel, and pour a few buckets of water downward, you can clearly see that the water flow is absorbed by the gaps, and gradually goes deep into the ground.

Seeing this scene, Song Siyuan's eyes showed excitement: "It seems that we have found the edge of the cover of the sky, this should be the edge of the cracked rock formation in the eastern foothills, and under these cracks there should be an underground river.