When the ironclad warriors were touring and living in Tianhuo City, the mountains behind Tianhuo City were also busy.

After three days, Tie Niu and Jin Chen teamed up to create a machine to hit the mountain and dig rocks, although it was far from the kind of machinery in later generations, but it was already thought that it could be.

In addition to the new machinery, under the guidance of Chu Nan, the clansmen quickly mastered the method of fixed-point blasting, which increased the excavation speed by more than one or two times.

Moreover, in order to dig this cave, Chu Nan directly ordered the use of the army, and thousands of Tianhuo soldiers came, and the work efficiency was increased by more than one or two grades, and the entrance of the cave expanded rapidly.

Three days later, the entrance to the cave was enlarged fivefold, and a ray of sunlight finally shone in, and at the very moment when the sun shone in, a miserable cry came from the depths of the cave, and then immediately disappeared.

When the sun shone into the depths of the cave, it seemed to produce some kind of reaction, and the whole cave seemed to be lit by a huge light bulb, and the cave, which was originally pitch black, instantly brightened up, as if it were day.

"It's ......"

Everyone looked at all this in disbelief, thinking that it would be a long time before they could dig up the rocks above before they could actually explore the cave.

But the changes in the cave were really beyond everyone's expectations, with only a ray of sunlight, and the whole cave was like a lighted light bulb.

"I remember that fluorescent stone can emit light in the dark when it is irradiated by the sun, but it can't be so exaggerated, right? Is it some magic I don't know? There are witches and saints in this world, even gods and demons may exist, and this kind of magical magic does not necessarily exist. "Chu Nan has experienced so many things, and in the face of this incomprehensible thing, he has slowly become accustomed to it.

What's more, he has now become extremely powerful, confident that he can deal with all problems, unless it is really a god, it is an existence beyond human beings, he has never seen it, so he does not know what ability the other party has, whether he can deal with it.

But as long as it is not beyond the scope of human beings, he is confident that he can deal with it, even if it is a witch, a saint and a wise man, he can crush it.

Chu Nan didn't rush down to investigate, because he didn't know how long this light would last, but continued to let people dig the hole wide in case something happened.

At this point, the rest of the process is faster, and the hole expands at a visible rate.

One night, the entrance to the cave was as bright as day, and the next day, more sunlight shone into the cave, making the light inside brighter and brighter, even a little dazzling.

Chu Nan asked people to cover the entire cave entrance, leaving only a small opening to observe.

I want to see how long the light inside can last without sunlight.

After experimentation, without the follow-up sunlight, the light in the cave lasted for seven days, and then slowly faded, until ten days later, it completely disappeared, and the entire cave fell into darkness again, as if it had become a bottomless abyss again, and at the bottom of the abyss was hidden a netherworld tunnel that led to nowhere.

Now that he knew the limit, Chu Nan asked people to start exploring, and he also entered the cave to see what secrets were hidden inside.

The cave is very large, after entering it, it feels bigger, at first it was estimated that it was more than a dozen acres large, but now it seems that it is even bigger than this.

There is a staircase down from the hole, and the stairs also emit the same light, like the glass with a light bulb installed inside, and like a large glow stick, but the light is much brighter than the light stick.

It was about fifty zhang down, and then he came to the bottom of the cave, the bottom of the cave was wider, and Chu Nan even had a feeling that the mountain on which Tianhuo City was backed seemed to be completely empty, and this was just an entrance, because when he looked inside, he couldn't see the edge at all, and the whole body exuded light.

There are many passages on the nearby rock wall, and there are many doors on the passages, these people are also made of this kind of glowing substance, Chu Nan counted, there are a total of nine doors, and there is a button on each door, which should be the button to open the stone door, and he immediately ordered that everyone should not touch the things here without permission.

"Tens of miles in a radius? But compared with the Heavenly Volcano, it is still only a very small part, if there is also a hollow mountain behind these doors, maybe the entire mountain of the Heavenly Volcano has really been hollowed out, I said how the Heavenly Volcano is like a huge terrace, it turns out that this place has really been inhabited, and the mountain should have been transformed by them. Chu Nan muttered to himself and circled around the altar.

The whole altar is very huge, hundreds of feet high, the stone platform is made of countless nameless stones, Chu Nan temporarily calls it fluorescent stone, so many fluorescent stones piled up into the altar, Chu Nan felt extremely shocked when he saw it, how much power can this be to complete this project, mainly, where to find so many fluorescent stones, unless it is man-made.

"The volcanic mountain is arranged like terraces, could it be that those cut stones were made into this fluorescent stone? But this altar doesn't use that much fluorescent stone, right? Could it be? Chu Nan hurriedly came to the rock wall and stretched out his hand to wipe it.

Then he summoned a magnifying glass and a microscope with extremely high magnifications from the dream system, carefully observed the rock wall, and came to the conclusion that the entire rock wall of the cave was artificially pasted with a layer of fluorescent stone, because from the microscope, you can see that there are extremely small gaps, which are not visible to the naked eye at all.

Chu Nan observed a lot of places, there are such subtle gaps, if you guess correctly, the boulders that were mined outside the Heavenly Volcano were divided into countless plates, and I don't know how to process them, they became this super fluorescent stone, and then they were pasted on the stone wall, which formed the current landscape.

More than a dozen warriors followed closely behind Chu Nan, vigilantly observing the situation around them in case something unexpected happened.

Chu Nan slowly poured the entrance of the altar, there was a step here to be able to ascend the altar.

Chu Nan let those guards not have to follow, he walked up the altar alone, climbed the steps, every ten zhang one layer, and then a new step would appear, and then up, Chu Nan looked down, there was a wide platform on each floor, but there was nothing on it, bare.

He was not disappointed, and continued to climb up, until he came to the last layer, that is, the ninth layer, this layer is the top, the top is very wide, with a radius of nearly 100 zhang, surrounded by some strange hollow carvings, which are very exquisite, but the carved things on it, Chu Nan does not know at all.

In the center of the altar, there was a huge monster corpse, the monster corpse was lifelike, as if there was a faint low roar coming from his mouth, making people dizzy to listen to it, Chu Nan immediately retracted his mind, while being controlled by this magic sound, he lost consciousness.

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