The length of the entire artificial passage is about thirty miles. For ordinary people, it may be quite long and takes more than half a day, but for these people with high martial arts skills, it is only half an hour.

After feeling the space became empty, Huo Hai once again ignited a illuminated firework.

"Wow! I didn't expect that Liu Xiu had built such a large project underground. This could no longer be considered an underground palace, but should be considered a dungeon." Seeing the cave wall range illuminated by the end of the light, Huo Hai exclaimed in surprise.

The cave is at least ten feet tall, with various stone sculptures on the left, and even an underground river flowing around the cave hall.

In the center of the cave hall, there is a large open space, with a round bell tower design in the center. Of course, the ground of the cave hall is not bare, with stone slabs carved with various patterns.

"Look at the other side on the right, there are several stone doors, which should be the stone chamber." Zhao Yun said.

"Go and have a look." Anyway, the Xuanwu Giant Turtle hadn't come for a while, so Huo Hai was not in a hurry to assign any tasks.

The stone door of the stone chamber is very tall, weighing at least tens of thousands of kilograms. Zhao Yun pushed it in front and didn't push it open, but Huo Hai was familiar with it and found mechanisms like lamp holders and beast heads next to him. There was no way. I watched too many tomb-robbing movies and TV series in later generations, and it was affected.

"No! There is no mechanical to open the door." After searching for a while, Huo Hai wondered.

"There may be something left by Wang Mang here, so Liu Xiu naturally doesn't want anyone to get it. However, it's easy to open it. We can just lead the Xuanwu giant turtle to hit these stone doors later." Zuo Ci thought of a way and said.

"Then let's go to other places to see, there seems to be a noise there." There was no noise near the stone gate, and Huo Hai pointed to the depths of the cave hall.

Soon, they walked through the center of the cave hall and came to a mechanical area.

"This thing is so exquisite that it is actually turning constantly." Ge Xuan looked at the rotating gear tracks with interest.

"This should be a mechanical clock, which is used for timing. It is used to drive the clock on the bell tower in the center of the cave hall." Huo Hai looked at the entire machine with a night pearl and said.

"It's just a matter of time, but it still needs to build such a complex mechanism? How much bronze will it waste?" Zuo Ci bounced the mechanism with his finger, and then said after distinguishing the material.

"This is different from the hourglass and sundials you usually look at. Even if it is more accurate than the armillary sphere? It is much more accurate? Because it has a second hand, maybe you don't know the importance of accurate timing? The reason why I can learn to draw talismans in one day? A large part of the reason is that I have a timekeeping tool that is accurate to milliseconds? Once the precise timing is applied, the success rate of drawing talismans or alchemy will be greatly improved? It is even possible to achieve batch manufacturing." Huo Hai pointed to the constantly rotating dial on the bell tower in the center and explained to everyone.

"Liu Xiu has such a good thing, so he won't leave it to his descendants?" Zuo Ci, who had seen Huo Hai's painting talisman, instantly understood what Huo Hai said, and raised questions again.

"This thing is not a product of this world at all? It should have been created by Wang Mang? Of course Liu Xiu would not use it. In these stone chambers, there must be various tools for making such mechanical clocks. To obtain those things, our Heishan Village's craftsmanship can be improved by a great step. We must find it out this time? Take it back." Huo Haidao.

Later generations unearthed an accurate measuring tool made during the Wang Mang period, caliper.                                                                                                                    

Of course Huo Hai would not think? A caliper was unearthed? In this era, there was only a high-end measuring tool, a caliper? There must be many other tools. Wang Mang is a person who even wants to make an aircraft. No matter what, he must have accumulated a certain industrial and technical foundation, but these things were deliberately erased by Liu Xiu, the chosen son of God.

Continue to look down, Huo Hai saw many things that cross the ages. He could keep turning the water wheels, curved plows, double-winged mountain plows, rotor rakes, steel ball bearing axles, etc., all of which are made of thick bronze and are easy to preserve. If these things are used as templates, a batch of things that are one level higher than those used in Heishanzhai, etc. can be made.

"Wang Mang is definitely a science student." After reading dozens of larger things, Huo Hai smiled.

Even if those stone chambers cannot be opened, these things alone can already greatly help Heishan Village.

"Uh, what is a science student?" Ge Xuan asked in confusion.

"It's like you, a person who specializes in creating. In my world, he is called a science student. He learns scientific knowledge in mathematics, physics, and chemistry, and specializes in making things that can improve people's quality of life and work efficiency." Huo Hai explained to him.

"If I were in your world, I would definitely be studying how to practice, break the void as soon as possible, ascend to become an immortal, and what's the use of making these things?" Tong Yuan said with some disdain.

"Well, theoretically speaking, these things have been studied to the extreme and can also make people break the void and go to the world outside the sky. There is a saying that "the way is simple, and the path is the same." That's what it means!

Moreover, you must not underestimate these things. If everyone has these things, their productivity will double and easily solve the problems of survival such as food, clothing, housing and transportation. By then, society will be a new situation, at least there will be no more wars and no more innocent people will die.

However, the treasures left by Liu Xiu were not used well by his descendants to enrich the country and the people. It’s a pity, but it’s a pity!" Huo Hai explained to everyone.

As soon as he finished speaking, a roar came from the entrance of the passage. Everyone knows that the Xuanwu Giant Turtle is coming.

"There are candlesticks around, and there are many dried-out grease and wax pieces inside. Everyone starts to ignite them. As for the task of stimulating the giant black turtle, it is handed over to senior Gun King and Xiao Ge. By the way, Zilong, you can use bows and arrows in the distance and shoot the guy's eyes from time to time to keep it in a state of irritability." Huo Hai was teaming up with his teammates in the game to a map and began to divide the work and fight the boss, directing everyone.

However, when the Xuanwu giant tortoise entering the cave hall from the passage crawled straight towards this side, he felt that all his division of labor was invalid, because it seemed that he was the only one in the Xuanwu giant tortoise's eyes.

"I'll go... He seems to be trying to eat me. What do you guys do? Find a way to attack him and distract him. I'll run away first..."

At this point, all Huo Hai's speculations have been confirmed that the news in the God-Rich Chapter is indeed not very reliable, especially the news that others have seen.

Xuan Zhen and Xuan Cheng, who were carrying several tubes of solution on their backs, took the lead in setting a distance with Huo Hai. If the solution was damaged, then they would have to wait for the opportunity.

As for the other people, since the attack could not cause damage to the Xuanwu Giant Turtle, they can only shout "Come on" to Huo Hai at present.

Soon, each man and a turtle started racing around the circular cave hall with a diameter of at least 300 meters. Tong Yuan and Ge Xuan could only go up to tease when the Xuanwu giant turtle's manic mood decreased.

Zhao Yun was a little anxious when he saw this scene, but he threw various stone sculptures on the left side of the cave hall, trying to block the route of the Xuanwu giant turtle chasing Huo Hai. The effect was small and could basically be ignored.

Moreover, after Huo Hai ran around the field for a while, these stone sculptures became obstacles for Huo Hai to escape. Therefore, Huo Hai, who had only needed to run forward, now needs to leap through various obstacles like parkour athletes, and his physical energy consumption increased sharply.

Fortunately, he started practicing martial arts early after traveling through time. Otherwise, he might have been forced to get out of the first lap. No one present could stop the attack of the Xuanwu Giant Tortoise. Even Tong Yuan's strongest attack was just a blow to the Xuanwu Giant Tortoise. The slightly shaking of its tortoise shell was a response to Tong Yuan's accumulation of power.

The battle of a certain number of battles was completely different from the same tonnage or a certain level. After Huo Hai started to breathe, it became even more mysterious and had the possibility of a car overturning. However, at this time, the entire cave hall suddenly became brighter.

“Huh…”

Everyone looked around in confusion and found that there were some braziers made of stone troughs on the round cave wall. The distance between each stone trough was exactly the same. The location was the point of the second hand of the mechanical clock in the cave hall that had been working for more than a hundred years. There were sixty stone troughs, and each four stone trough was separated by four stone troughs, which was definitely the five-minute mark.

When everyone was surprised why these stone troughs were suddenly filled with tinder and began to burn, the entire cave hall began to move.

The ground paved with stone slabs began to rotate. Huo Hai was running like a high-speed treadmill. He ran very fast, but he didn't move much distance in place. Of course, the same was true for the black turtle that was still chasing it.

Huo Hai, who didn't dare to stop for a moment, now knew. No wonder he and others never encountered any mechanism along the way. It turned out that this large cave hall with a diameter of more than 300 meters was a large mechanism.

"It should be the Xuanwu Giant Crawling in circles in this cave hall that triggered this mechanism." Zuo Ci said.

"This should be the killing formation set up by Liu Xiu against the intruders. Now we are terrible." Huo Hai, who had a premonition that there would be a super attack that he could not avoid at all.

"No, only the Xuanwu giant ghost runs around the cave hall to trigger this mechanism. Does Liu Xiu still want to kill the Xuanwu giant turtle?" Ge Xuan focused on the changes in the cave hall and speculated nervously.

"He should be..."

Before Huo Hai finished speaking, he saw stones and dust falling off at the top of the cave hall.

"Wow, this cave hall is about to collapse!" Seeing that he was hundreds of meters away from the passage, Huo Hai said in a despair.

At this time, on the rapidly rotating ground, not to mention hundreds of meters, it is very difficult to move dozens of meters in the direction of the channel. There is a giant black turtle behind him, and like other people, you can wait for the turntable to turn to the entrance of the channel and then jump over.

However, the next moment, he saw something even more terrifying. A circular stone pillar with a diameter of at least three meters was inserted straight downwards on his head.

The diameter is about ten meters, and the height is unknown. How heavy are the stone pillars with a diameter of at least fifty meters?

Huo Hai could not calculate for a moment. Anyway, there were hundreds of tons, and there were more than one large pillar like this, and dozens of them were stabbed from the top of the cave hall at the same time.

The entire process of falling would not exceed two seconds. In desperation, Huo Hai did not dare to continue running forward at all, but turned to the direction of the Xuanwu giant turtle and jumped counterclockwise, which was a subconscious reaction when he was about to be pressed into a pool of blood by the large stone pillar.
Chapter completed!