Song Siyuan saw the situation in front of him, nodded at everyone and said, "My prediction just now is right, as the jade vein moves forward, what we find is that there will be more and more ores, and now the jade veins have become more and more from this filamentous vein, and irregular large areas of jade have begun to appear, this situation just proves that the rock formation here seems to come from Hongbai Mountain, and it is likely that the fault of Hongbai Mountain fell on the sinkhole to form, which also means that we are in the right place, the more jade veins and ores there are, the more proof that we are very close to the sinkhole."

Song Siyuan's statement lifted everyone's spirits, and the pace under their feet became faster and faster, looking for these green and white mottled jade ores to continue their journey.

The more you go forward, the more you can feel the black and gray ordinary rock gradually receding, and the surrounding rock layers are gradually replaced by jade ore, some of the ore has been shed under the washing of the water flow, and it can be seen that the jade embryo is polished very crystal clear, smooth and round, as if a large piece of jade was born in the rock layer, which is completely different from the black and gray mottled rock.

A few hundred meters further out, the black limestone layer has completely faded without a trace, and as far as the eye can see, it has become the world of jade ore, and the underground river has also changed from a grotto to a rock cavity, and the cavity does not know how wide it is

, how wide, how high, how big, I can only feel that even the lamppost of the flashlight is beginning to shine on the stone wall in the distance.

It can be seen that in the cavity of this rock formation, there seems to be an underground jade river, which is craggy, stacked and piled up, hanging like a dog's tooth, vertical like a bamboo shoot, with different sizes, connected front and back, falling to the ground on its back, prone and bending, stretching in this rock cavity in various postures.

Walking in these jade mountains, whether looking up or down, or in the four directions of southeast, northwest and northwest, you only feel surrounded by endless blue and white jade, and even the boundaries between the upper and lower are blurred.

These jade rivers are often surrounded by ponds and flowing rivers, and under the reflection of flashlights and torches, the lights flow in all directions along the direction of the river, and even the surrounding jade peaks are completely illuminated, leaving only the dazzling and gorgeous, and the original roughness of the previous moment is no longer visible.

If you have to make a comparison, just now they seemed to be walking in a dim and weird underground river, now it is like walking on the ground on a snow-capped mountain glacier, full of crystal clear translucent jade, no longer see the feeling of darkness and chaos, the surrounding hall is bright, has completely illuminated their respective bodies...

As they walked, the erosion of groundwater never stopped, slowly flowing through the jade face, constantly carving the smooth bottom of the river.

"How did this landscape come about?" Xu Xiake asked curiously.

Although everyone was surprised by the gorgeous crystal of the Jade Mountain, they were also curious about the formation of the Jade Mountain, if it was only a rock fracture for them, why was it only here that the landscape of the Jade River was formed? The other rock formations are just ordinary underground channels, so should the groundwater shape the rock formation space, and there should be a priority and disadvantage?

Song Siyuan obviously didn't understand this either, and everyone walked to the edge of the Yuchuan, and the end seemed to be completely cut off, leaving only a slope that sloped downward.

Everyone stood on the side of the slope, and the underground river behind them continued to flow into the depths of the slope by the height difference, and after the speed of the water accelerated, the light on the surface gradually became shattered from a slight reflection, like broken glass, flowing mottled and mixed light, constantly rushing into the gap under the slope.

Observe carefully, the upper layer of the slope is the jade that hangs down like a dog's tooth, from the bottom of these inverted stones, to the slope is at most four or five meters high, compared to the height of the entire rock cavity, it can be regarded as a narrow gap, compared with the narrow upper and lower height, the left and right width can no longer be estimated, from the left and right opening and closing distance of the slope, at least it matches the width of the entire rock cavity.

If viewed from a distance, the slope resembles a huge crack at the end of the jade mountain, facing down to the grotto that they can't see.

Song Siyuan observed the situation here, and then she figured out why the mountain stone was carved like this, her eyes lit up, and she explained: "If my guess is correct, this is already the end of the Hongbai Mountain fault rock, this huge transverse crack, probably located on the edge of the sinkhole and the fault rock, if this is the way to understand, the huge cavity and jade peak in front of us appear here, just

Understandable."...

She motioned for everyone to look at their feet, the speed of the underground river under their feet became significantly faster when they passed through the slope, and under the height difference, it fell into this horizontal crack like a waterfall, and when the water was washed too quickly, they could even see some loose jade particles on the surface, which were directly washed into the narrow gap, which showed that the underground river was very strong in scouring downward.

Seeing this, they already understood the role of slopes, and Song Siyuan continued: "The shaping of underground rock formations is mainly related to two factors, one is the fission of rock formations by plate geological movements and earthquakes, and the other is the erosion of rock formations by underground channels and underground water veins. Mainly the latter is to blame."

Speaking of this, she pointed to the Tamagawa River and said, "There are countless rock cracks on the underground river where we are, and when there is enough rain in the desert, this rainwater will pass through the sand layer, precipitate into the cracks of the faults, and finally seep into the groundwater through the cracks, and merge into the underground river channel where we have traveled all the way."

"Since the Hongbaishan Fault covers the sinkhole, the closer the underground river is to the sinkhole, the faster the flow rate will become, and eventually it will flow deeper from the slope we see now into the deeper rock formations."

For any stone, the faster the water flows, the more it is eroded, and the slower the water flow, the slower it is eroded, these jade rivers are located in this section of the river with the fastest flow, plus the jade texture is softer than most stones, after the river washes, it is easier to become round and bright, in the thousands of years of rain washing, forming the rock cavity jade river they see now.

"I guess the end of this slope should be the sinkhole where the royal city is located, and we have to go down to the bottom of the slope to see." Song Siyuan analyzed to the end and said categorically.

"Then it's dangerous."

Keli took a flashlight and shone the jade river below the slope, this slope is shaped like a horizontal crack, and the top and bottom are staggered by jade like dogs' teeth, and you can't see what the end is at all, it looks like a bottomless glacier, and it is a bit too dangerous to rush into the jade river without knowing what the end is.

Gu Xixi said: "In my opinion, let's choose two people to go down to explore the way, don't rush down all at once, in case of danger, the two people can take care of each other."

Yue Guanchao nodded, he also agreed with their proposal, and said, "Then it is up to me and Keli to explore the way. The two of us are the best in the world, and we can help each other in times of danger, so you stand on the shore and help us pull the ropes."

As soon as he said and did, he and Keli took out the rope and fastened it around their waists, and then fixed the other end of the rope to some protruding jade mountain stone pillars, and began to slide down the slope under the control of everyone, circling between the edges and corners of the glacier.

After about a stick of incense, the rope was pulled, and everyone slowly pulled them up the slope.

After the two of them let go of the rope, Song Siyuan asked, "Judging from the time you got off the rope, the length of the entire slope should be 500 to 600 meters, what is the end of the slope?"

Yue Guanchao took a breath, and his face became excited: "You guessed right, the end of the slope has come to the bottom of the sinkhole, we have already seen the ruins of that royal city, you will know when you go down with us later."

After Yue Guanchao and Keli explored the path in advance, they didn't look so much like headless flies when they went down, and everyone added two other ropes in a row to fix them on the stone pillar, and climbed directly down the Yuchuan River along the ropes.

By the time they all climbed to the end of the Yuchuan, the situation at the bottom of the sinkhole had already come into view.

The area of the entire sinkhole, much wider than that of the royal city, showed an irregular shape, neither round nor square, and looked like a huge hole smashed down by some meteorite or heavy object, and the top was completely covered by a fault rock split into several pieces.

They came out of the part of the fault that shattered along the edge, like a slope that diverted water from the underground river to the bottom of the sinkhole, which was washed over thousands of years to form some meandering channel in the sinkhole.

If you look closely at this fault rock, the surface is similar to the veins they have seen, and on the black stony background, there are many jade vein hairsprings that are constantly implicated, otherwise

Some particles such as spar agate protruding from the rock formation, under the light of the candle flame, glowed with starlight, and the huge rock top became a bright starry sky.

Underneath the fault rock is the sinkhole stone wall!

You can see that the rock wall near the Hotan River is relatively steep, almost straight up and down, and there are many cracks in the rock wall. These cracks burst out of small waterfalls, forming various arcs into the underground river, but in the direction they came down, the stone walls were not so steep, forming some gradual slopes, and the strange rocks on them were mixed with a large number of jade rivers, grottoes, and gravel stalls.

Further down, you can already see the Sand Sea King City that they have been looking for for many days!