However, the terrain is gentle, there is no upward slope, and after walking for a short time, you will see a circular square surrounded by many such wide forks.

In the center of the square is a fountain, and below it is a half-moon-shaped pool of black stones.

It is very vast, and the moon-white spots of light converge in all directions, like a wonderful map of the stars in the night sky, and several people are not attracted by this scenery, but trotted to the waterhole, watching the clear cool water drilled out of the fountain, falling into the waterhole, stirring up bursts of splash.

At the bottom of the pool, there are many small holes, which are supposed to be outlets, but it is unknown where they flow.

"Can you drink this water?" Diana asked, licking her lips.

Yun Yanuan used his fingers to snort in the water, sniffed with his nose, there was no peculiar smell, and then rubbed it in his nose ruthlessly, the inside of his nose is mucosal tissue, the most sensitive, if there are irritating minerals in the water, he can find it at once.

As for parasites, in the desert hundreds of meters underground, there is really no need to worry about this thing. The spring water is applied to the nasal cavity, and there is no irritating and hot feeling, only a cool breath.

The fat bear smiled at this time: "Drink, it's definitely fine, there are fish in it!" ”

A few people followed his fingers to look over, isn't it, a group of small silver-white fish are drilling around in the water, about the size of a person's index finger, very happy, which is enough to prove that this water is not mineral poisonous, and it is living water, otherwise the fish would not be able to reproduce.

The fat man took the lead and lay on the water's edge, and began to pour water into his stomach like an old cow, and several other people were already thirsty and smoking, and they also grabbed the edge of the pool at the moment, drank water in a big gulp, and filled their stomachs with water, before they stopped.

It's a completely artificially renovated fountain pool, about half the size of the central circle of the square, which is enough to be considered a fountain even in a metropolis.

They can't figure out why this fountain was formed because the water table is relatively high, then why has the water not overflowed for thousands of years, after all, the water table is so high that it is impossible to drain the water from the ground.

If this fountain, like modern fountains, is mechanically driven, then it is even more unbelievable, not to say what kind of mechanical energy can rotate for tens of millions of years, only to say where the energy that makes the machinery rotate comes from.

Ke Xin studied these strange things, trotted to the crystal orchid, first listened carefully, and then lifted the Tai Sui growing below, only to see the gurgling shallow water flowing at the bottom of these Tai Sui, extending into the distance.

She smiled and returned to the water's edge, and said, "I guess there are fountains like this at every fork in the road, and all this leaky water is irrigated under the crystal orchid in the center of the road." ”

The bear fat man praised others with difficulty, and said: "This ancient man has two times, and he actually used the high water level underground to form a fountain, and then irrigated these flowers and plants, it is really a cow fork, no wonder these flowers can live for tens of millions of years!" ”

Ke Xin shook his head and said: "I estimate that the ancients are even more powerful than you think, even more powerful than our modern technology!" ”

The big guy was stunned, because they all accepted the fat man's explanation, isn't this the truth?

The fat bear man was puzzled: "Isn't it just to use the geographical advantage to let the fountain, which does not need artificial energy at all, complete this cycle?" ”

Ke Xin shook his head and said: "Not to mention that the groundwater level is not so stable, and secondly, if it is really a high water level, it is difficult to build such a large underground city, and it is just a natural fountain, which cannot reach the use of such a large area of buildings. ”

If it is a natural fountain, then it cannot be irrigated with such a large area of plants, so to complete all this, it must be done by human machinery, but is this a fountain driven by machinery?

Yun Yanuan shook his head and said, "I'd rather believe that this is a natural fountain, and it's more real than a mechanical fountain!" There is no energy source that can provide a machine for tens of millions of years of use! Nuclear power plants will not work! ”

But after thinking about it for a while, he suddenly thought about walking on the side of the road, and as he walked, he pulled out the saber at his waist and said, "Just try it!" ”

Several people didn't know what she was going to do, but they were worried that it would be unsafe for her to be alone, so they hurriedly followed, and saw Kexin on the black wall, using a saber to pry the glowing thing down.

However, this thing seems to be very strong, and after a long time of strength, it didn't move at all.

Yun Yanuan didn't know why, and asked, "What are you going to do?" Destruction of historical and cultural heritage! ”

Ke Xin grimaced and said, "Don't talk nonsense, help me get a piece of this thing, and I'll know if this fountain is natural or mechanical!" ”

A few people really couldn't figure out what these glittering treasures had to do with whether the fountain was a mechanical water lifter, but Yun Yanuan saw her serious appearance, so she had to pull out a thick-backed sharp knife to keep everyone away, and then turned her body around in place, and slammed the back of the knife on the thing that was shining with moonlight.

There was a crisp "click", and several people watched as the glittering thing on the wall disappeared, and then hurried to look for it on the ground, but there was nothing shining on the ground except black or black.

Maya's eyes were sharp, she took two steps, picked up a round thing on the ground and said, "This is what I just smashed!" ”

Ke Xin hurriedly took the ball in her hand, the weight was not heavy, even lighter than plastic, but it could be intact under the smashing of Yunya Nuan's big knife, which was really impressive.

Carefully observe the ball under the flashlight, and find that there is a small round hole on one side, extending to the inside of the sphere.

In this wall, there was a circular depression, which was tightly connected to the sphere, and in the depression, a very thin thread stretched out, but Xin pulled the thin thread and stuffed it into the small hole of the ball, and the ball, which was originally gloomy and light, suddenly lit up.

", wires?" The bear fat man was surprised.

Ke Xin also felt incredible, even if this was in line with her own guess, but this thread was not metal at all, and she had never even seen such a thing, not like a dead thing, but like the rhizome of some kind of plant, flexible and damp.

"What the hell is going on? Is it a real light bulb? This light bulb is worth a lot of money when you take it outside, and it doesn't break when I cut it down! Yun Yanuan shook his head and said, in fact, he couldn't believe it, this turned out to be a light bulb, who said that this is a night pearl full of walls, and it is easier to accept than this.

Ke Xin took the ball that left the line and was no longer glowing, looked around, looked at the fountain again, and finally set his eyes on the crystal flowers that were blooming, gasped and said:

"If my guess is correct, the source of the energy of this underground city is these crystal flowers and Tai Sui ......"

It is recommended to read the new book of the mysterious god writer Dark Xiulan