Chapter 834

At this time, Yan Tian and others have skillfully equipped with solar energy absorption equipment, and then connected with the drilling machine. Professor Zhou put the drilling machine in the position where the signal was sent, and turned on the drilling machine. Suddenly, with the buzzing sound, the drilling machine quickly went down like a vole digging a hole.

According to Professor Zhou, the machine can penetrate about two meters per minute, and needs to rest for about ten minutes. The mountain is 400 meters long, so it takes more than three hours to drill the hole to the bottom of the mountain.

So Zhou Zhong went to a shady place and sat down with his knees crossed.

There was a premonition in Zhou Zhong that the underground city might not be as simple as Professor Zhou thought, and the majestic aura of the underground could not be compared with any other place on the surface. Let's take the simplest example. Even though the aura absorbed in the cultivation of the spirit elixir in the middle of the week is not as much as the majestic aura underground! What's even more surprising is that the depth of the two hundred meters is not deep. Why does the aura exist only in the underground, but not in the mountains?

And the two villagers said that when they were young, a group of mysterious people came to the mountain. Although they were not sure that they were looking for the underground city, Zhou Zhong thought there might be some connection. So in the face of the next location of the exploration, the week must keep themselves in the best condition, in order to deal with emergencies.

After more than three hours, the machine arrived at the bottom of the mountain. Yan Tian, who operated the machine, cried excitedly: "teacher! In the end! It's the end of it

Professor Zhou and others were also greatly excited when they heard the news. They ran to the cave and looked down. However, there was a lot of darkness underneath, and they couldn't see anything at all.

Zhou Zhong opened his eyes and frowned. The mountain has been dug through, but the aura hasn't come up yet? This is really strange.

"Yantian, how about the soil below? Can we continue to dig?" Professor Zhou asked Yan Tian.

Yan Tian shook his head and said: "according to the signal transmitted by the unmanned equipment, the underground city is kilometers away from the ground! The height of the underground city is more than 40 meters. If we dig down rashly, it is likely that a large area of collapse will be caused by soil loosening. We must go down and collect soil samples for analysis

Professor Zhou nodded: "that's right. If the soil is too hard or too fluffy, it may collapse during excavation. That's bad."

"But who's going down to collect soil samples?" Dong Jiao looked at several people and asked.

The cave is so deep that it takes more than 400 meters to reach the bottom. Moreover, it is only one meter wide, and the bottom is dark. Putting aside some psychological fears, it is difficult to say how to go down such a deep height, or how to get up at that time.

"We have rope, we can only slide down the rope and climb up." Yan Tian took out the rope contained in the salute. The UAV equipment transmitted signals, but it showed that there was about 1500 meters away from the top of the mountain, so they specially prepared long ropes when they came.

"I'll do it." At this time, Zhou Zhong came over and said with his face as usual.

"Mid week? Can you do it? " Several people are full of questioning asked.

"No, you come?" Zhou Zhong asked with a smile.

All of a sudden, several people did not speak. It was true that they did not dare to go down. How could they climb up after 400 meters in the afternoon?

Professor Zhou asked people to tie two ropes to two tree trunks with double safety. Then one of the ropes was thrown into the hole and the other was on the waist of Zhou Zhong. They would drop down a little bit with the speed of diving in the middle of the week. Then they said to Zhou Zhong, "be careful. If you think you can't do it, give us a signal. Pull the rope. Three short, three long and three short. This is international rescue The standard of the aid signal, we will pull you up

"Well, I see." Zhou Zhong didn't care about this. If it wasn't for fear of scaring Professor Zhou and others, Zhou Zhong didn't need these ropes to go down.

Surrounded by the crowd, Zhou Zhong went into the cave along the entrance of the cave. With a loose rope in his hand, he slipped down.

"Zhou Zhong, slow down!" Professor Zhou several people were startled, and quickly told Zhou Zhong.

The cave is very dark. Zhou Zhong simply closes his eyes and observes the surroundings with his divine sense. When he drops to 200 meters, the majestic aura directly gushes up. This kind of intensity is like falling into the sea! But there is no water in the sea, and all of them are Aura!

In the middle of a week, the real Qi in the body spins and starts to absorb these huge auras quickly. And as the middle of a week goes down, the stronger the aura in the air becomes.

"It seems that today's technology unmanned equipment can not detect aura." Zhou said to himself.

After a while, I finally came to the bottom of the week and landed on my feet. I felt that the goose soil here seemed to be moist because of the lack of sunshine all the year round.

Zhou Zhong took out the bag given by Professor Zhou and put some soil around him. Then he had an idea and began to explore around with his divine sense. Zhou Zhong was surprised to find that he was not far away from where he was. There was a passageway directly underground! And the passage seems very wide, and there are steps!

Zhou picked up the hole drilling machine on the ground. Seeing that the power light was still on, it showed that there was still energy. So he turned on the switch to drill in that direction.Above the cave, Yan Tian suddenly saw that the equipment showed that the machine was moving. He cried out: "teacher, Zhou Zhong is using the machine!"

"Oh?" Professor Zhou is also surprised that he doesn't know what to do.

"In this week, it's not enough to succeed, but more to fail. Even if you have a higher status, you can't mess around! What if there is a landslide? " Yan Tian is very dissatisfied with Zhou Zhong.

Professor Zhou shook his head and said, "no, Zhou is not a random person. We are waiting."

After about 20 minutes, the machine stopped, and after more than 10 minutes, Zhou came up from the underground cave!

Several people are slightly stunned, the hole machine has just stopped for 10 minutes, which means that the week only took 10 minutes to climb up from below? This What speed is this?

"What did you do with the punch in the middle of the week?" Yan Tian saw Zhou Zhong coming up and asked immediately.

Zhou Zhong looked at several people with a smile and said, "I found a tunnel leading to the underground below, which is not far from the position we dug, so we can continue to dig."

"What? Is there a passage down there? " Professor Zhou and others were shocked to hear the news.

Zhou Zhongtou said, "yes, and the passage also has steps. It's obviously artificial."

"Go, let's go down!" Although Professor Zhou is old, his momentum is much better than those young students.