A bottomless black hole, the entrance is only a little larger than an ordinary manhole entrance. Zhuang Hui's "scream" just now came from here.

Mu Feng turned on the high-intensity tactical flashlight.

I shine on the entrance of the cave.

The hole is very deep and the tactical flashlight can illuminate hundreds of meters, but the hole cannot see the bottom. In other words, the hole is not completely straight downward, and there is also a turbulent wind sound inside.

The hole is very deep.

"Zhuang Hui, Zhuang Hui..." Mu Feng tried to shout a few times, almost unable to hear any echoes.

Isn't this woman really falling in?

Although he didn't like Zhuang Hui very much, she was Professor Zhuang's daughter and a member of the exploration team. He had the obligation to protect the safety of his team members.

Just as he was about to go down and take a look.

Suddenly there was a sharp sound of wind in my ears.

Mu Feng copied it casually and grabbed it in his hand and saw it was a stone.

Turning his head and looking, who is not Zhuang Hui?

"Are you playing tricks on me?" Mu Feng was really angry. He almost went down just now. The woman stood on it all the time, but refused to agree to him.

"I'm standing behind you, you can't see it." Zhuang Hui covered her mouth and smiled. Obviously, she didn't feel guilty about teasing Mu Feng at all.

Just now, I was focused on observing this underground black hole. I did ignore the observation of the surrounding environment and did not notice that Zhuang Hui appeared behind him.

However, Zhuang Hui is definitely not an ordinary person. Even a sneaking master like Leng Ying would find it, not to mention that Zhuang Hui is only seven or eight meters away from him.

Zhuang Hui is definitely an ancient martial arts master who is not inferior to him.

From the previous elusiveness and the speed and body movements he took to Monkey Mountain to collect treasures, it is not difficult to draw such a conclusion after mutual verification.

A young and beautiful woman who has been taking risks all year round will not believe anyone if she doesn’t have the ability to protect herself.

"You discovered this hole?"

"The Eagle leader said yes." Zhuang Hui said I was like this, what can you do to me?

"I will remember you a great merit. You are here to guard me. I will go back to get the rope and explore this cave." Mu Feng ordered.

"Why are you going back to get the rope?"

"Then you go back to get the rope, and I'll wait for you here, how about it?" Mu Feng said in reverse.

"You said I'll go back to get the rope, and I'll go back to get it. I still can't go back. I stayed to look at the entrance of the cave, and you go back to get it!" Zhuang Hui's temperament started to appear again.

This woman is really difficult to deal with. She is reasonable and becomes unreasonable.

"It's useless, it's a waste of time!"

Mu Feng snorted coldly, raised his legs and ran back towards the camp in the direction he came.

"Old Dong, call two people, bring a rope, and go with me. Zhuang Hui and I found a hole in the ground and are ready to go down and take a look first."

"Captain the Eagle, take me with me?" Niu Fei volunteered.

"Okay, you're the one."

"Be careful." Lan Xin instructed.

"I know, we will return for no more than four hours at most, regardless of whether we find it or not." Mu Feng nodded and explained.

Bringing ropes and necessary climbing and lighting equipment, as well as some supplies and first aid medicines, a group of five set off.

Zhuang Hui guarded the entrance of the cave and did not leave.

She also cleared out the weeds near the entrance of the cave, so when Mu Feng returned, the entire entrance of the cave had been fully revealed.

First use infrared equipment to scan the entrance position of the hole to determine the reason for the hole formation.

"No need to analyze the composition and rock age. This is a volcanic vent, which has been formed for at least a thousand years. Judging from the volcanic rocks and ash at the entrance of the cave, this volcano should be an extinct volcano, but there is very likely to be slurry below, so, are you sure you want to go down and take a look?" Zhuang Hui said.

"The volcanic vent is somewhat similar to what is recorded in the notebook, but the sky is too dark and the fog is so strong. If there is a Sanzhishan nearby, then this will be the right way." Mu Feng said.

"Where is a beauty, ask it, it may know." Zhuang Hui said.

"It doesn't know where it flies, and I guess it won't be able to count on it for a while." Mu Feng shook his head and said.

"The leader of the Eagle, Senior Sister Zhuang Hui, since we are all here, we won't go down and take a look. Even if it is not the black hole we are looking for, at least studying the geological structure under the extinct crater will be helpful for us to master and understand the formation of the foggy forest." Niu Feidao.

"Assistant Niu said something reasonable. Eagle, you've come here. Let's go and have a look. What if it's what we're looking for?" Old Dong also echoed.

"Okay, let's leave two people above, I, Assistant Niu, and Lao Dong, and three others." Mu Feng said.

"Where is me?"

"We don't know what the following situation is yet, so don't go down, it's dangerous." Mu Feng refused Zhuang Hui.

"You look down on us women, are you? I have experienced many dangers over the years. Maybe when I get to the bottom, you are not as good as me." Zhuang Hui snorted coldly.

"Since you're coming, then come." Mu Feng said, Zhuang Hui did have an advantage that none of them had.

These people, including Lao Dong, have no experience in going to caves to explore. Although Niu Fei also engages in wild geological exploration and has some experience, he is a bit worse than Zhuang Hui, a professional explorer.

"Eagle, the longest rope we carry is only 500 meters, and if it exceeds 500 meters, it cannot be guaranteed to be safe." Dong Haifeng reported.

"I understand. We don't know anything about what is going on under the hole now. After entering, be careful and pay attention to our own safety. Once there is danger, we will retreat immediately." Mu Feng said solemnly.

As the team leader, Mu Feng is of course the first one, Zhuang Hui is the second one, Niu Fei is the third one, Dong Haifeng is the last one, and there are two people left at the entrance of the cave to meet at any time.

Da da...

The stones at the entrance of the cave were very slippery. When you stepped on it, the loose stones fell down, and there was almost no echo. The hole was deep enough.

The further downwards, the wider the passage becomes, the stones become much dryer, and a curved slope is formed, which enhances the adhesion under their feet, and can walk down safely without ropes.

"Look, what is that?"

"This is a volcanic bacteria, a species of bacteria in an extinguished volcano in life." Zhuang Hui glanced at it and recognized it.

"So beautiful, can you eat it?"

"It can be eaten, and it is also a precious medicinal material. It is one of the raw materials for a genetic medicine. If you didn't come here first, there will be such a large piece."

“…”

"Continue to rush the road, the things are growing there, and you won't run by yourself." Mu Feng turned his head and shouted.

"yes."

Keep moving forward and soon approached the maximum length that the rope could be lowered.

But there is still no end to it.

"Old Dong, please contact the people above and say we should continue to move down and let them not worry." Mu Feng ordered.

"OK."

The passage below is very spacious, and you can feel the majesty blowing on your face from time to time. The pungent smell is not very heavy. It has been emitted for thousands of years. This extinct volcano may no longer have the possibility of erupting again.

The passage wall is very smooth, and you can imagine the spectacular scene where the hot and hot magma squeezed upwards through here and gushed out.

After the volcano erupts, the slurry cools down or another channel for catharsis is found, and a hollow environment is formed underground. For thousands of years, the squeezing and movement of plates have created a unique and complex underground world.

"Listen, there seems to be a sound of water flowing in front of you?"

"Well, it's the sound of water flowing. Is there an underground river under this volcano?"

"The world is full of wonders. In the past, there were slurry everywhere, hundreds or thousands of high temperatures, but who can tell what it will become in thousands of years? The place occupied by our Federation on Planet 17 was a barren land a thousand years ago, but what about it after a thousand years?" Zhuang Hui said, "It has not been transformed into a paradise that everyone yearns for."

Humanity's powerful survival and transformation ability was among the best in the Milky Way at that time, and this must be admitted.

Crazy...

After untied the rope, the four people could almost walk side by side inside, and the road here has become quite spacious.

"What a big underground river!"

The four of them were suddenly cheerful, and a wide underground river rushed forward, and the waves slapped the stones on the shore, stirring up waves and making roaring sounds.

"Eagle, our current location is about three to four kilometers away from the entrance of the cave, and the vertical distance is about one thousand five hundred meters." Niu Fei held the instrument in his hand and conducted the measurement.

Mu Feng nodded. The altitude of the peaks in the Mist Forest is generally above 700 meters. According to Niu Fei's measurement data, they have already penetrated the ground at least 600 meters.

The location of the Yuanjing Mine is at least 300 kilometers deep into the ground!

This can also be confirmed by the records on the "Sweeping the World" notebook. He walked more than a thousand hours before he discovered the location of the Yuanjing Mine.

According to the speed of a normal person walking, about five kilometers per hour, considering physical strength and road conditions, it is actually necessary to reduce the calculation by half. For more than one thousand hours, theoretically, you can walk more than two thousand kilometers, but you have to make a half-fold calculation based on this.

In other words, the real road to "sweeping the world" is only about seven or eight hundred kilometers.

Because the underground road is not a straight line, it is estimated that the depth position of the Yuanjing Mine underground is basically consistent with the current position.

Such a magical passage to the underground is definitely not something that humans can do. Even the prehistoric civilizations discovered by humans in the Milky Way are not capable of doing this.

Only the magical work of God or nature.

"The water quality is clear and rich in trace elements. Some heavy metal ions exceed the standard and cannot be consumed directly, but you only need to filter out the heavy metal ions." Niu Fei said excitedly.

"It seems that we don't need to worry about the water source at least." Dong Haifeng said.

"The adventurer 'sweeps the world' said in his notebook that the river had almost no end and he didn't know where it flowed. He walked along the river and ventured through at least seven rushing secret passages underwater, the longest one, he held his breath underwater for more than thirteen minutes, and that time he almost died."

"First do a holographic scan of the channel, let's go up first, everyone discuss it before making a decision." Mu Feng decided not to move forward.

"Look, there are fish in the water!"

The waves were rolling, and a big snow-white fish suddenly jumped out of the water. If Niu Fei hadn't screamed, Mu Feng and the others would have found it very hard.

The snow-white fish body, the scales are as big as a palm, and the head, the long whiskers, and the fins are facing the sky, like the back of a knife.

With a thud!

The big silver-white fish fell into the water, and it scattered the water surface and disappeared in a blink of an eye.
Chapter completed!