The temperature here was already very high, and Sun Wuru felt the heat and thin oxygen coming from the ground. Fortunately, there was no lava nearby, otherwise the strong sulphur dioxide might have killed them.

"The suits you wear can keep you warm, as long as you have enough energy." The "friend" motioned to Sun Wuru to adjust the smart suit to a fully enclosed state, and the refrigeration system began to start, and a layer of liquid was embedded between the suit and the human body, constantly taking away excess heat.

They carry the latest energy storage batteries in their suits, and the energy stored can last for a month.

In this case, if it is paired with Qin Chu'an, then this is a strong enough special combat team.

But on the other hand, on the side of the academy, there were only three people left. Su Duan, Yun Qianliu, and a silent ordinary youth. His eyes always fell on Su Qian's body, and like Yun Qianliu, it was obviously his duty to protect him.

It seems that he has a credit for eliminating the traces, and now, the backpack that was originally carried by the strong man has all fallen on him. The backpack seemed to have everything, so heavy that it almost covered his body, but he still looked relaxed.

The three of them in the academy all looked relaxed.

But Sun's ruthlessness is not easy.

Because the scene in front of him has exceeded his expectations.

This is a huge underground space, compared to the underground where it once fought against "Nameless", or the computing cluster of the vast "Kars" under the academy, it is not as primitive as this underground.

Yes, it was wide, it was magnificent, unadorned, and even the flare that shot out seemed to be just a little starlight in the night sky. Sun stood in it ruthlessly, only feeling that he was incomparably small.

This place has already exceeded the average depth of human exploration, and even the nearly five hundred layers of underground space under the academy are only less than two thousand meters.

Human beings need energy, minerals, and all kinds of elements in the periodic table to meet the needs of computers for experiments and research in basic science.

But below 5,000 meters, it is still a forbidden area for humans.

"The Soviet Union once had a plan to keep drilling until the instrument failed, and it is said that they drilled 14,320 meters, which is the confidential information that Dongguo learned." Su Duan stood in this hot underground like no one else, and the clouds next to him seemed to exude boundless coldness, allowing him to ignore the high temperature of this underground. He looked at the caves and rock formations above his head, judged the age of the period, and continued to say to Sun Wuru and the others: "But that was three hundred years ago. Today's instruments can easily drill down to a depth of 10,000 meters, but the current development space of human beings is still maintained at about 3,000 meters. Space and the ocean can be roamed by humans, but not underground. It takes a lot of resources to drill down and build, and for Dongguo, fully developing one meter of underground space is equivalent to developing 9 million cubic kilometers of land. It doesn't make sense. ”

"But there are traces of intelligent life activity here." Chuan Wu took a closer look at the cave and soon found clues.

Above them was a heavy crust, but the cave was sustained by a few stone pillars, each clearly carefully designed to ensure that the cave would exist for tens of thousands of years.

"Why can't it be a gift?" Qin Chu'an was a little puzzled.

"Because the pyramid space above us is only 500 cubic meters." Sun ruthlessly recounted the conclusion of "Friend": "The reason why we feel wide is because the monotonous yellow sand and artificial sun interfere with the line of sight, but it is actually only a small space. And seven hundred meters below the pyramid is the real destination. This cave stretches for at least a few kilometers, and if it had been dug by the people of the Lost Oasis, there would be no need to bring us in with this kind of strength. ”

"So what?" Du Shaozun looked around, and the black federal uniform set off his figure very thickly: "We didn't see anything?" ”

As he spoke, the flashbang above his head gradually lost its light. The young man behind Su Duan took out a new flashbang from his backpack, but two sets of night-vision glasses.

Everyone's sight was gradually deprived, Chuan Wu frowned, and his fingertips began to jump with pure white light, but he was ruthlessly held down by Sun Wu.

His ears picked up sound waves that humans couldn't hear, and although he didn't hear any sounds, his "friends" gave warnings.

Soon, in the next moment, everyone felt a slight vibration from the soles of their feet, the sound of rolling rubble, and what they couldn't hear just now was the cries of their friends.

It's bugs.

In the night vision device, a dense tide of insects is pouring out from the cracks in the rock wall. They weren't the treasures that Du Shaozun brought, and they didn't look ordinary. To adapt to the scorching underground, hard rock formations, these fist-sized bugs have evolved hard shells and chisel-like claws.

But they are supposed to be fed with underground minerals, how can they attack humans?

"Spawn, stupid." "Friend" disagreed: "They have to find a relatively safe place to spawn, and in the underground, rocks with poor thermal conductivity tend to form natural burrows, so they are also used to spawning at low temperatures." Your light scared them, now ......"

"Will it be dangerous?"

"It's dangerous for ordinary people, their claws can dig through hard rock formations, and given enough time, they can also break through the carbon fiber composite armor you wear." "Friend" mocked: "But who are you?" ”

Before he finished speaking, a cold air pierced the surroundings like a sharp sword, and the small insects that attacked the three people of the academy were quickly frozen in the ice. The blood in their bodies is so scarce that even lowering the temperature makes it difficult to die, but it is enough to stop them from moving.

On the federal side, because everyone wears night vision devices, it is not easy for Chuanwu to use the gifts. So Huang Sanshao waved his hand, and the dust around them gathered around them, forming a sand wall, temporarily blocking the attack of these insects.

This is just a stopgap measure, and the only way to kill them is probably only the gift of Chuanwu.

Perhaps, there is no need to kill it.

Du Shaozun was silent for a moment, and reached out to grab an insect from outside the sand wall beside him, its shell was not only hard, but also glowing with a metallic luster. Seeing such an ugly insect dancing in front of him, Du Shaozun seemed to have heard something funny.

"What's the matter with you, little brother?"

His voice was no different from usual, but the little insect quieted down for a moment, and the sharp minions slowly placed on Du Shaozun's palm, not even leaving a trace on the battle uniform.

"Take it, third young brother, it seems that I have a new baby." There was irrepressible joy in Du Shaozun's voice, for him, the best gift was a new animal.

The yellow sand dispersed according to the words, Du Shaozun took a step into the insect swarm, as if a signal spread like lightning, and all the insects stopped their movements in unison. Then, under Du Shaozun's signal, it gathered into several black insect tides, lying quietly on the rocks, and it was already integrated with the environment.

"Awesome, awesome." In the dark, Sun ruthlessly clapped his hands when he saw the thin Su Duan, then pushed his glasses and said, "Being able to control so many creatures at the same time must be a test of skill. ”

Although Du Shaozun listened very happily, he just snorted in his nose and put the palm-sized insect on his shoulder, triumphant.

"Alas, there are fewer of us, and now it feels more dangerous." Among the three people in the academy, only Su Duan was talking, and he seemed to be in a good mood, and he didn't feel any nervousness.

Even this sentence has a bit of a smell of gunsmoke.

At swords' points.

This sentence, Huang Sanshao is not easy to accept. The young man in front of him looked young and polite, but between his words, he seemed to have a purpose, like a chess player who was strategizing. The people of the Federation do not like the confrontation between languages, and when it comes to writing, the Easterners are superior.

The cave returned to silence, and the deep underground could not be reached, and in Sun's ruthless night vision, only the green outline not far away could be seen, and the surrounding rocks protruded.

Above their heads, thousands of meters of the earth's crust are pressed.

Under this pressure, in the face of everyone in the Federation, Su Duan can still talk and laugh.

"Let's go, let's talk as we go." Su Duan quickly broke the embarrassment, took a few steps closer to Sun Wuru's side, and then took the initiative to walk deeper into the cave: "I know a lot of information about the Lost Oasis, maybe I can use a little secret in exchange for the safety of me and my friends." ”

"He's been in the driver's seat." The "friend" said to Sun ruthlessly: "But what is even more terrifying is that we really don't know anything. ”

"Do you want to arrest him?" Sun ruthlessly had a whim.

"Nope." The "friend" didn't explain much: "You can't afford to die." ”

After solving the insects in the cave, Du Shaozun got a new boost. The cave seemed to be devoid of other animals, and it was eerily quiet.

"The rock formations here have been around for 30 million years, so what does it mean if we can prove that this cave is not a natural formation?" Su Qian walked in front of the team, and Yun Qianliu followed.

"Someone has been here a long time ago, or ......" Chuan Wu cautiously looked at Yun Qianliu's back, and a faint light flashed between his hands.

"Or maybe this cave was built 30 million years ago." Su Duan took his words, and gently stroked the stone pillar beside him with one hand. The magma rock here is very hot, but with Yun Qian flowing nearby, he is not worried about the temperature: "It's a bit unlikely, but in any case, human interest in the earth is similar to that of space." Because this represents the history that has already happened. The bugs we just encountered are likely to have been breeding here for 30 million years, they have not adapted to the outside environment to evolve, and they should still retain the genes of 30 million years ago. It's possible that there is some kind of interesting secret hidden in this gene. ”

Speaking of this, he paused, turned his face sideways, looked at Sun Wuru not far away, and slowly spit out two words.

"Immortality."

"Anyone wants this thing." Huang Sanshao was dismissive: "But what does this have to do with the Lost Oasis?" Went to great lengths to let us come down just to see this ancient cave? ”

Su Duan smiled, but before he could speak, Sun ruthlessly interrupted them.

"Be careful." He looked at a stone pillar not far away through his night vision device, repeating the words of "friend", but his tone was full of doubt.

"There's something wrong with the stone pillar in front."