The expedition consisted of 6 people, including Zhang Yang.

They entered the cave and walked for 10 minutes until they reached the bottom of the cave. There was some equipment at the bottom of the cave, and it was clear that the village chief had dug privately before they came. Zhang Yang remembered the temporary wooden house of the village chief's house, which was very large and built three months ago, and now that he thinks about it, the wooden house is not for people, but for storing mud and stones. Digging a passage will inevitably mine mud and rock, which will occupy the living space of human beings, so the mud and stone in this cave should be in that wooden house.

Zhang Yang said in his heart, if he fails this time, he must fill in those mud and rocks.

Expeditions are different from private mining spaces because they don't need to transport excavated mud and rock.

"Let's get started."

Among the six people, the eldest spoke, this person was named Zhou Sheng, and he had a big shovel in his hand. The shovel was special, a foot long. Zhang Yang said in his heart, this shovel is estimated to be an ancient relic, because the shovel actually has a gauntlet, when Zhou Sheng held the shovel tightly, the shovel handle actually stretched out a lot of metallic tentacles, integrating his hand and the shovel.

This is definitely something from ancient civilizations.

Zhou Sheng did not hide it, and under the expectation of others, he said: "This is what I found in an excavation...... In fact, you should also feel that in the history of our human civilization, there should be another civilization, this civilization is very powerful, even if they leave a little something, it can make us go crazy. As he spoke, he stretched out his hand, and the shovel began to wriggle, and in a moment, a shovel turned into a sword. Zhou Sheng said: "You have all seen, its prototype is not a shovel, nor is it a sword ......" A few minutes later, Zhou Sheng's shovel changed several shapes.

"Brother Zhou, where did you find that thing?" The interrogator is named Kong Sen, 32 years old, unmarried, and dreams of making his own career in the empire, but his career is not going well, and several expeditions he participated in have been fruitless. At this moment, he saw an ancient relic that could be transformed, and his heart was full of excitement, and he said that if he also had such a relic, then he would definitely be able to get ahead in the empire.

Almost everyone else is thinking the same way.

Zhou Sheng didn't hide it, he said: "Although the empire does not recognize the existence of ancient civilizations, the imperial expedition team has been looking for ancient ruins...... You've all heard of Ouyang Shunzi......" When Zhou Sheng asked, everyone was puzzled, even Zhang Yang, because Ouyang Shunzi was sentenced to death for anti-race crimes 100 years ago. At that time, Ouyang Shunzi put forward a point of view, that is, the shell world, he believed that now human beings live in the shell, and there is infinite space outside the shell.

How can such a view be acceptable.

If such a view is true, then what does the world outside the shell look like, is a huge spherical space, or something. At that time, because Ouyang Shunzi couldn't tell what infinite space was, he was executed. But why did Zhou Sheng mention Ouyang Shunzi now, could it be that ancient civilization is related to infinite space.

Zhang Yang and the others all looked at Zhou Sheng.

Zhou Sheng said: "It's a little bit ......" Zhou Sheng said that he took out a map from his pocket, the map was very strange, there were many small balls on it, a total of ten, one of which was very large, and the other nine seemed to revolve around this big one. Zhou Sheng said: "This map I saw during an expedition, and the original work has been sent to the Imperial Museum. Now this picture is drawn by me from memory, you see this small ball......" Zhou Sheng pointed to the earth, but he didn't have the concept of the earth at that time, so he said: "According to the speculation of imperial analysts, the space of this green ball is very large, at least 1 billion cubic meters, if this small ball can be found, then the living space of our human beings can be greatly improved......"

"What about this?" Zhang Yang pointed to the sun because he saw that this small ball was the largest.

Zhou Sheng said: "This small ball seems to be not suitable for us human beings, and imperial analysts have found from many sources that this giant space has many factors that are unfavorable to human beings...... Now there are only these four small balls suitable for us human beings to live......" Zhou Sheng pointed to Earth, Mars, Mercury and Venus.

"Have the Imperial expeditions found these spaces?" Someone asked.

Zhou Sheng shook his head and said, "Not yet, there are no clear coordinates on this map, and the imperial analysts have analyzed it for several years without analyzing where the location of these small balls is...... But ......" Zhou Sheng hesitated here and said, "But...... Recently, imperial analysts have begun to study Ouyang Shunzi's posthumous writings, and they speculate that these balls are in the outer shell world, not in our so-called inner shell world......"

"Isn't Ouyang Shunzi crazy?" Someone asked rhetorically.

"He's crazy...... Zhou Sheng hesitated and said, "But the imperial analysts have studied for a long time and have not found the location of these ten spaces, so they speculate that these ten major spaces are not in the world we know, and outside the world we know, there is another world, and that world seems to be infinite......"

"The World Inside the Shell...... The world outside the shell ......," Zhang Yang muttered.

"It should be like this...... Zhou Sheng nodded, and said, "What I want to say now is that if we explore and dig well, we can not only get some ancient things, but maybe we can also find the legendary infinite space, which is the outer world that Ouyang Shunzi said......

Everyone else was a little excited, if they were in the inner shell world, then the outer shell world must be infinite.

In a moment, they began to dig.

The excavation of the expedition team was very professional, and the excavated mud and rocks were never brought out, but put behind them, and then continued to dig in front of them, so that they were like bugs burrowing, and they were in the ground, and there were mud and rocks in front and back, left and right. They don't worry about food, they don't worry about oxygen.

Zhang Yang took out a bottle from his backpack, and there was a food plant in the bottle, the size of a palm.

There were three fruits on the top of the plant.

The plants that grow in the underground world are very special, they do not need sunlight, but rely on their strange roots to absorb metal oxides in mudstone, oxidize and decompose them in the body for their own energy, and then release the by-products, which are photons and oxygen. Like the red plum grass in Zhang Yang's hand, it will not only glow and release oxygen, but also produce fruits that can satisfy hunger.

Red plum grass bears fruit every 5 hours.

Other people also carry similar fruit grasses, among which Zhou Sheng's one is very special, it is actually Yali grass, and the Yali pears produced can not only satisfy hunger, but also refresh and eye-catching.

After a simple meal, they continue to dig.

Ten days later, they dug more than 500 meters, and at this time, Zhang Yang suddenly shouted to stop.

"What's going on?" Zhou Sheng asked, he didn't feel anything wrong. However, he also believed in Zhang Yang, because Zhang Yang was Liu Muchuan's apprentice. Yanagi River has always been a legend of the empire, and if it weren't for that incident, Yanagi River would still be a legend of the empire.

Zhang Yang looked at his direction gauge and said, "We dug the reverse ......"

"Is it the other way around?" Zhou Sheng was puzzled, and so were the others. They all carried advanced equipment, and every inch in the passage was calculated, and it was impossible to reverse it. Although they also bypassed some of the hard rocks to make it impossible for the passage to be straight and straight, they believed that they themselves were always going in one direction, as the direction gauge they wore was always pointing in one direction.

Zhang Yang pointed to the direction instrument in his hand and said, "This is what my master left me, it can't be wrong......

"The direction pad?" Zhou Sheng glanced at the direction gauge in Zhang Yang's hand and saw that it was the direction gauge often used by Liu Muchuan. That direction gauge is ancient, not only is it infallible, but it seems to have other abilities. After a moment, Zhou Sheng said: "Dig back...... We've dug it up, there's a force in this place that's affecting our direction pads......"

At the moment they are in a space of 5 square meters......

[It is a mystery whether there is an underground civilization, but according to the first person who proposed the underground civilization, he invented the gyroscope, such as a bicycle, and the rotation of coins is based on the principle of gyroscope, indicating that there is indeed an underground world. 】