Somewhere in the southwest of China, the mountains are like gathering. The jungle is reckless, and there are often tigers roaring and apes crying. Because of the abundant rain, the rocky rock formations are strongly weathered. And the texture of the rocks here is also very peculiar. The water solubility is unusual, so in this seemingly ordinary mountain field, there are some strange and strange shapes. The shape is weird, but it has a different flavor.

And this mountain and water is also famous all over the world.

However, although these rocks are strange in shape and quite flavorful, they also block the way for human beings to expand their territory. Such a landform, the soil is barren and cannot be cultivated at all. Not to mention the production of anything valuable. The structure between the rocks has also become loose due to long-term rain erosion and weathering. Over time, the place became deserted.

Since ancient times, it is as good as that. So, in the recklessness of the jungle, there are countless secrets. The location of the ghost city of Fengdu is just a strange and solid existence in this mountain wilderness. And outside the ghost city of Fengdu, those places are still uneven, and the water erosion is serious.

And this kind of flowing water erosion is the easiest to create, in addition to the jagged and strange rocks, there is also the deep and unfathomable cave that does not know where the root is. After tens of millions of years of water drops and water washing, this piece of mountain and rock underground that was originally particularly water-soluble has already become like an apple that has been eaten by dozens of insects.

Knowing the modern age of advanced technology, some people often find some deep and wide underground caves in this area, but they don't know where the end is. In the cave, sometimes there is a silent underground river that winds like a giant snake. and some strangely shaped stone stalactites made by heaven.

Yunlei now appears in an underground cave hidden in the primeval jungle outside the ghost city of Fengdu.

The entrance to this underground cavern is not very large, only four or five square meters. Hidden under a banyan tree with a shade covering a radius of tens of zhang, and covered with barren weeds, low shrubs, and banyan tree aerial roots, if you don't know the location of this cave accurately, whether it is a cultivator who has achieved cultivation or the scientific and technological power that modern mortals are proud of, I am afraid it will be difficult to find such a place in this vast mountain.

And such a cave, although the entrance of the cave is not large, but once you enter it, along the natural terrain of this cave, you will find that the world in it is far from being predicted by outsiders. This cave is getting wider and deeper.

And this darkness is very different from the darkness reflected in the night of the city, or the darkness in the wilderness where the stars and moonlight can be seen in the distance. It is a kind of darkness that is absolutely suffocating, but also absolutely safe and pure. The entrance of the cave itself is narrow, and it is covered by layers of light, and the light that penetrates into the cave is naturally very little, and the cloud and thunder enter the cave, but after dozens of steps, when you turn back, you can no longer see the light of the sky that penetrates into the hole.

Yun Lei carried eight strong flashlights, and after entering this underground cave, he turned them all on. These eight bright flashlights were gathered in one place, and the light emitted was extremely bright. Moreover, the eight pillars of light shine together, and the light goes wherever it goes, specific and small. Subtle.

Yun Lei saw that this hole was not the horn shape he had originally conceived. This side of the world in the cave is extremely large. Originally, when he had just entered the cave that was only four or five square in size, the cave around Yun Lei was only that little size. But after walking out of dozens of steps, the terrain in this cave changed suddenly, and the heaven and earth around Yun Lei, the length, width and height of this cave, compared with when he first entered the cave, expanded dozens of times?

Yun Lei swept the environment in this hole with the strong flashlight in his hand, and found that his current foothold was almost the size of a basketball court.

And the world in the cave in the distance is also wider and flatter, Yun Lei walked forward, only to see the world in the cave in the distance, from a basketball court, to a football field, and then from a football field, into a big playground. Then, this large playground has become at least the size of a sports center in a second-tier city in China.

And Yun Lei traveled all the way, but he didn't see any wide underground water flow. Perhaps the underground river here has dried up due to geological changes. Yun Lei saw a thin stream of water flowing through the edge of this vast underground cavern.

Although this cave is a typical karst cave landform, Yunlei also saw some stalactites growing on the surface and the top of the cave along the way. However, the top of this cave seems to be relatively dry, and Yun Lei has not found any water dripping along the way. It seems that these stalactites have stopped growing due to changes in the earth's crust.

The location of this karst cave is the great secret that the ghost monk of Wunian told Yun Lei - whether it is the ancient Fengdu ghost city or the Fengdu ghost city that is rebuilt today, it is actually just a disguise! The real Fengdu ghost city is not this ghost city with strong walls. It's in this hidden cave!

Of course, this underground cave is actually just a façade.

According to the words of the Wunian ghost monk, this real ghost city of Fengdu is a self-contained space and world similar to the space gourd of Yunlei!

It's just that this space doesn't seem to be as good as the space gourd of cloud thunder. Not only is it a little small in size, but it must not be carried around. but with the help of the breath of the earth. A huge mustard stone was refined into this earth, and a world was formed.

It is said that the huge mustard stone, which is tens of meters long and wide, is almost similar to the volume of high-rise residential buildings in the city today!

It is said that this huge mustard stone that has been refined on this earth is a treasure obtained by several ghost immortals who were in charge of the ghost city of Fengdu in ancient times. In order to refine it on this earth and become a unique space world, it took an unknown amount of thought and a huge amount of heaven and earth treasures.

In ancient times, this ghost city of Fengdu, where thousands of ghosts gathered on the surface, was just to refine the existence of this huge and incomparable mustard stone collection resource. Most of the thousands of years of income from the ghost city of Fengdu were used to refine this huge mustard stone on the earth.

The matter was originally kept secret. Those ghost immortals from ancient times followed the immortals and Buddhas of the heavenly court, and after leaving this heaven and earth, they disappeared. And the huge mustard stone that was refined into one with the earth here, after it was refined, the spatial power in it was also mobilized by the ancient ghost immortals, and it scattered out in all directions, becoming a static space barrier.