Yu Fei quickly followed the black shadow and dived deeper and deeper. Soon Yu Fei swam through the passage he had opened with his own hands and the link inside the mountain.

Just after leaving the passage, Yu Fei suddenly felt a sense of enlightenment, because he had entered the hollow in the heart of the mountain. This hollow was very large and stored a large amount of water, so it had sufficient water volume and impact before

Yu Fei was seriously injured.

However, compared to ordinary people, it is almost plunged into absolute darkness. When ordinary people enter here, they can hardly see anything, even if something appears in front of them, they cannot see it.

However, Yu Fei's eyes were still able to capture the faintest light that was barely noticeable, and then clearly see the surrounding situation.

However, he still couldn't see far in the water, but he could see that there were creatures in the water. Those animals were swimming far away and did not dare to approach Yu Fei.

Yu Fei knew that it was almost wishful thinking to catch up with the creatures here in the water, so he simply floated upwards.

Previously, the water inside could be drained out through the siphon effect, which means that there is a place connected to the outside world to allow air to enter, so that the siphon effect can take effect.

Yu Fei floated up very quickly. When he floated up, he found that there were at least three kinds of fish living in the water around him. However, these guys avoided Yu Fei at a distance, so Yu Fei couldn't see clearly what they looked like.

Look.

Wow...

Yu Fei rushed out of the water and took a breath of air. There was a rotten smell in the air, just like the smell formed by long-term fermentation of branches and leaves.

However, Yu Fei immediately discovered that something was wrong, because there was a large amount of flammable gas in the air. Yu Fei's strong nose had smelled the smell of the biogas pool built by the villagers, so he immediately came to a conclusion.

An ordinary person would probably suffocate to death after inhaling such a few mouthfuls. Although methane itself is not toxic, high concentration of methane will reduce people's oxygen, which will still cause suffocation.

However, Yu Fei's body can not rely on oxygen for a short period of time, so after inhaling it, there will be no problems at all.

Yu Fei swam to the water's edge. The edge of the cave was not very smooth. There were protruding rocks everywhere. Yu Fei climbed up and sat down.

The unknown creatures in the water disappeared, and the creatures in the water became active again. Yu Fei sat on the stone and looked at them carefully. He had never seen these fish before, or even heard of them.

One of them is a giant salamander, another one looks like a close relative of the giant salamander, and another one looks like a crucian carp but not like it. Anyway, each of them looks like their eyes have seriously deteriorated, and I don’t know what they taste like.

The space here is very large, just like a super huge football stadium, and the water below is at least the size of three or four standard football fields.

I don't know how a cavity was formed here, and it finally became a gathering place for groundwater. Yu Fei saw that several streams of water were constantly filling this place with water, and continuously flowing into the water below.

But Yu Fei looked up for a while and found no place connected to this place, but he was sure there was such a place, and it would not be very small, otherwise it would not be able to provide the air supply volume when the siphon effect occurred.

Looking at the cave above his head that was like an iron pot, even though it was surrounded by stones, Yu Fei could not climb up in the opposite direction. There was a layer of slippery stuff on the surface of the stones here, which could not lend much strength.

"How to find the entrance to the cave!"

Yu Fei frowned and thought about it. As he thought about it, he unconsciously took out a cigarette and put it to his mouth to light it.

Just when Yu Fei put his finger on the lighter, he seemed to be startled by something and quickly let go of his hand. In fact, he thought that his behavior was a bit suicidal. The air here was full of methane. If this place

If an open flame appears, the air here will be detonated immediately. Yu Fei, who is exposed to the air, will definitely bear the brunt of the misfortune. He himself cannot predict whether he will be killed when the explosion occurs.

Quickly putting away the smoke and fire, Yu Fei seemed to be inspired again and took out the lighter.

"Hehe, there really is no end to the road, let's set off a big firecracker for fun!"

Yu Fei showed a wicked smile on his lips.

Yu Fei quickly found a lot of things from the Dragon Ball space, and Yu Fei started tinkering with them happily.

After a while, a small device was made. It was a water-flow device, with two containers of different weights. After they were filled with water at the same time, the two containers were tied to both ends with a lever.

Open a dripping hole in the larger container. When the water in the larger container reaches a certain level, the container with a small capacity will fall. After falling, it will press on the lighter below, and the lighter will be lit.

After finishing it, Yu Fei was very satisfied with his little invention. He made this device to give himself a chance to escape and then detonate the methane here.

When the methane here is detonated and the terrifying airflow has nowhere to vent, it can only rush out from the hidden ventilation position. By then, the location where the place is connected to the outside world will be expanded, and it will not be difficult to find it.

As for the remaining energy, water is the most soft thing, so it will absorb the excess energy and prevent the entire mountain from blowing up.

However, this was just Yu Fei's imagination. He didn't know what kind of power and effect it would have after all the methane here was detonated, so the delay device was set very slowly, which was enough for him to dive into the water and escape completely.

After filling the two containers with water, he gently placed the lighter at the predetermined location. Yu Fei hurriedly jumped into the water like a sabotaging child and quickly fled the scene of the crime.

This time Yu Fei didn't bother to observe the fish in the water. Whether they could withstand this wave of explosions depended on their luck.

However, Yu Fei estimates that as long as the mountain does not collapse, these fish will be fine, because the water is very tolerant, and even if the water encounters a lot of pressure, it can flow out through the excavated channels to relieve the pressure.

Yu Fei left faster than he arrived. He didn't look at anything along the way and quickly dived into the water. After finding the excavated passage, he quickly swam away.

Swimming to the highest point of the passage in one breath, Yu Fei quickly jumped out of the water and ran towards the cave down the mountain.

Although Yu Fei felt that the possibility of him blowing up the entire mountain was very small, he still had to be prepared for such a thing to happen, so he planned to go back and let everyone in the base leave first.

In one breath, I ran to the cave entrance hidden in the towering tree. It was still dark at the moment, so except for the people on duty, everyone else was still sleeping, and the base was quiet.

"Emergency! Tell everyone to leave here immediately! Otherwise, your life will be in danger!"

As soon as Yu Fei rushed to the entrance of the cave, he shouted loudly.

This shouting startled the surrounding sentry and secret sentry, and they all rushed out. They didn't dare not believe Yu Fei's words. After all, Yu Fei was in their hearts at this moment, and he was an omnipotent image. Yu Fei said...

What happened is very likely to happen.

Those who heard Yu Fei's order immediately rushed in and sounded the alarm in the base.

In an instant, a terrifying whistle resounded through the cave, and the sound echoed continuously. No matter who was doing it, it was impossible not to hear it.

Moreover, Scar determined that this alarm was only allowed to be sounded if there was a huge crisis in the base, so the next moment the alarm sounded, people poured out everywhere. Some people were running and putting on their clothes, waiting to rush close to the entrance of the cave.

By then, the clothes were already on.

"Everyone, get out of the cave! The mountain might collapse!"

Yu Fei had someone find a big loudspeaker for him. Yu Fei found a higher place, raised the loudspeaker and shouted loudly.

The echo effect in the cave was very good. Yu Fei shouted, and almost everyone in the base heard it. Everyone ran faster. No one wanted to be crushed to death by the collapsing rocks.

Even Scar, who was sleeping, ran out while holding up his pants. When he ran to Yu Fei, he pulled him down from the stone he was standing on and ran outside together.

It is indeed an iron-blooded training base. Even the people here, even the cooks, are not ordinary people. Whenever you walk out, there are more than a dozen characters outside, so from the time the alarm sounds to everyone escaping, the whole process takes less than three minutes.

Thousands of disheveled people were frightened and escaped from the cave in their sleep. Some people ran out, only to find that their pants were on inside out. Most people simply didn't even put on all their clothes and ran out with only their pants on.

However, Yu Fei discovered that no one came out empty-handed. Everyone had at least one handy guy in their hand, and every one of them was actually ready to take action at any time.

"Brother Yu, what happened?"

Scar ran out in just his pants, holding a knife in his right hand. With his free left hand, he just pulled out Yu Fei, who was shouting with a loudspeaker.

Hearing Yu Fei shouting that the mountain is about to collapse, Scar was really frightened. He was really afraid that Yu Fei would finish shouting everyone and he would not be able to escape in time. If Yu Fei becomes abnormal again and a mountain collapses, he will be considered an iron man.

It will also be crushed into a discus.

"After the water in the middle of the mountain was drained, there was a lot of space inside. I wanted to develop it for us to use, but the air inside was full of methane, and I couldn't find a vent to use as a passage, so I made a delay device. After a while,

The methane inside is about to explode!"

Yu Fei pointed in the direction of the mountainside and said.

When Scar heard this, his jaw almost dropped.

The hole in the middle of the cave is filled with methane. If the huge energy and terrifying airflow after the explosion cannot be discharged through the vent mentioned by Yu Fei, then the principle of the explosion is equivalent to making a firecracker as big as a mountain.

, it could really blow up the entire mountain.

"Brother Yu, can you be more reliable? If you dare to use a mountain as a firecracker point, your own territory and people are still below. I'm afraid there won't be anyone like you in the world!"

Scar was about to cry. Yu Fei's crazy behavior was really unbelievable and laughable.

"I think it's very possible that if we invite everyone to watch an unprecedented fireworks show, it won't blow up the mountain. I'm asking you to come out just in case!"

Yu Fei shrugged and said.

"Brother Yu, I really regret meeting you!"

Scar felt that he was really being unkind. If the base he worked so hard to manage was buried, even if he couldn't defeat Yu Fei, he would still want to fight for Yu Fei.

The conversation between the two people was also heard by everyone around them, and everyone opened their mouths in surprise. They only knew that Yu Fei was very out-of-touch, but they did not expect that it would reach such a lunatic level.

Thinking that the whole mountain might be used as a firecracker, everyone hurriedly fled farther away, so that they would not be easily injured by accident. Moreover, even if it was about to explode, the effect from a distance would definitely be better than that from up close.

Thousands of people looked at the mountainside shivering in the night wind and waited patiently. However, after waiting for a long time, there was no movement. The tension began to dissipate. The cold defeated everyone's curiosity. Some people began to suspect that Yu Fei was...
Chapter completed!