A giant pit!

A giant crater with no end in sight and no bottom in sight appeared on the plain, exactly at the coordinates of the North Pole. From a distance, because of the angle, the crater formed an oval shadow on the horizon, and the rock giants chasing behind it stopped a thousand meters away from the edge of the crater, as if this was a forbidden area for them, and they did not dare to enter.

The Federation slowed down and cautiously approached the edge of the giant crater, and the data was given on the armored screen, the edge of the giant crater was approximately a perfect circle, with a diameter of more than 10,000 meters, reaching 10,103 meters!

It stands to reason that such a huge crater is very conspicuous from space even when viewed with the naked eye, but whether it is a warship radar or a reconnaissance satellite, they have scanned the surface of the planet many times, but they have not found its existence.

This phenomenon shocked everyone!

The Federation also has some similar optical stealth technology, which can create a simulated light force field to block the surveillance of orbiting satellites, but the maximum range is only 100 meters, the energy consumption is very large, and the duration is at most dozens of hours. The huge crater in front of me is more than ten kilometers in diameter alone, and the duration is unknown, it seems to be permanent, and the level of science and technology is not known to be high, far beyond the knowledge of the Federation.

After a few moments, the team finally reached the edge of the crater.

Standing here, everyone felt like ants standing on the edge of a cauldron, as small as dust, and their hearts palpitated.

Everyone mustered up the courage to look down, only to see a darkness, and then they realized that it was not a pit, but a bottomless giant hole. The entrance of this cave seems to lead to the legendary hell, and the wisps of air blowing up from below are terrifying, and it feels more terrifying than standing on the cliff of the abyss, not even in the dark of space.

Xin Lin squatted down and reached out to touch the inner wall of the giant cave, smooth and hard, shaped like glass, this is a solid substance formed after the soil is roasted by high temperature, but the temperature is much lower than the average temperature of the planet, only a dozen degrees, and it feels cold to the touch.

The angle of the inner wall is perpendicular to the ground and points directly to the center of the planet, but the armored ranging radar wave enters the giant hole and does not return, so it is supposed to be absorbed by some kind of material.

In this way, there is no way to detect the depth of the giant hole.

Xin Lin looked up at the opposite side of the giant cave, without the assistance of the armored light brain, he couldn't even see the edge of the opposite side with his eyesight, and couldn't help but marvel in his heart. It's hard to imagine how such a huge man-made fortification was created, and where did the excavated soil and rocks go?

"In the first two bursts of stellar energy, the energy pooled over the North Pole and then disappeared."

Qi Ying said with a solemn expression: "Now it seems that my guess is correct, the stellar energy is imported into the planet from this hole, and the remains of the super civilization should be hidden under here." ”

Everyone nodded slightly, which was obvious, but this giant hole felt too terrifying, and it probably wouldn't end well if you broke into it.

At this moment, a fragment of a battleship with a mass of several hundred tons fell from a high altitude and fell right into the hole.

The debris rubbed and heated, dragging a long tail flame, like a torch illuminating the inside of the giant cave, and soon after falling, it hit the glass-like inner wall, sending back a violent explosion, and then continued to fall, the light gradually faded and finally disappeared into the darkness, and even the sound of the impact could not be heard, and it was obviously far from the bottom.

"Oh my God, how deep is this hole?" Some of the mercenaries groaned with fear on their faces.

Zhuang Xiaolin broke the silence and resolutely said, "Let's go down." ”

"Huh?" The mercenaries looked at each other and asked with some fear, "Commander, do you really want to go down?" "Everyone is a little resistant, this giant hole feels really bad.

"What can you do if you don't go down, do you have a way to return to space?"

Zhuang Xiaolin asked rhetorically, looking into the distance, at this time, there were battles everywhere within a radius of several hundred kilometers near the North Pole, and they were boiling, and he said: "We are desperate now, those steel-maned orcs will soon gather, there are many of them, even if we don't go in, we will be dead." ”

It's a matter of either/or.

If you don't enter the giant cave, you will have to face the army of steel-maned orcs, and if you enter, you may be able to solve the mystery of the super civilization ruins and find a way to leave the planet.

Even though there was an unknown danger, everyone quickly agreed to go in!

Zhuang Xiaolin took a deep breath and stepped out from the edge of the hole, his body falling straight down, and at the same time, the armored flying engine turned on, slowing down the speed. He flew down more than a hundred meters without any incident, at least for the time being. The others also jumped into the hole, pulled a certain distance from the height, and fell down against the inner wall.

At the beginning, everyone controlled the speed of the fall to about 50 meters per second, not daring to be too fast, the light in the cave was still very bright, and they could see each other clearly.

After a few minutes, it has been more than ten kilometers below, the surroundings are gradually darkening, the hole above the head can see the whole picture, and looking back, you can still vaguely see the sky outside the hole, just like the bottom of the well in the literal sense of the word.

If it were on Earth, the depth would have exceeded the thickness of the earth's crust and entered the mantle layer, where the density increased dramatically, the temperature skyrocketed, and there were high-temperature solids everywhere. However, the temperature in the cave is still only a dozen degrees, the inner wall is cold, and there is no sign of deformation, which completely violates the common sense of geography and is incomprehensible.

Not to mention, there's still no bottom down there.

"Speed up!"

Zhuang Xiaolin shouted, adjusted his posture and changed to head and foot, the flying engine spewed out tail flames, and the speed suddenly increased to 200 meters per second, and everyone hurriedly accelerated to keep up.

The light from the cave above became dimmer and dimmer, and even the hole was slowly shrinking in the field of vision, at first it looked as big as a full moon, but after a few minutes, when everyone went deep into the cave for a hundred kilometers, the hole had become only the size of a cup lid, and most of the light could not reach here, and it was dark all around.

After another ten minutes, the entrance of the cave was only the size of a coin in his eyes, and at this time he had penetrated more than 200 kilometers, and he could not see his five fingers, but he still did not reach the end.

Zhuang Xiaolin accelerated again, and the team fell at a speed close to subsonic.

As it went deeper and deeper, everyone in the Federation was furious, and if there were claustrophobic people here, they would have been scared to death a long time ago.

"Does this giant hole really lead to the center of the earth?" Someone couldn't help but ask.

No one can answer this question.

It has been flying for more than twenty minutes, and the light brain inside the armor shows that everyone is at a depth of 300 kilometers underground at the moment. The planet is about 5,000 kilometers in diameter, and if it continues to fly at this speed, it will only take more than two hours to reach the center of the planet's core.

It's unimaginable!

If it is on the earth or other terrestrial planets, the position at this depth should be liquid molten matter, the temperature and density are unbearable, and the pressure is incalculable, but the inside of this giant hole is still unchanged, straight up and down, the diameter is always accurate 10103 meters, the temperature is kept at more than ten degrees, and there seems to be an invisible force field to maintain this state and ensure that the inner wall is intact.

Xin Lin had already used telepathy to explore the inner wall, but found nothing, the inner wall looked like ordinary soil rocks, burned into a glass shape by high temperatures, at least more than 300 meters thick, beyond his sensing range, so it was impossible to know whether the inner wall was behind the mantle structure.

As we get closer to the Earth's core, the planet's center of mass, even the felt gravity becomes smaller, about one-eighth less.

In a moment of restless silence, the crowd continued to fall rapidly, and the gravity slowly decreased.

Gradually, a faint speck of light appeared in front of me.

"Look!"

The mercenaries shouted one after another, all of them were in good spirits, and the appearance of light meant that it was almost there.

Everyone couldn't help but speed up, breaking through the speed of sound, and speeding towards the spot. The spot slowly expands in the field of vision, at first it is just a finger-sized spot, and after a few minutes, as the distance closes, the spot has become the size of a disk, and it continues to grow, gradually revealing its true face.

This is a circular plane with a diameter of 10,000 meters, the whole body is cast with some kind of pale golden metal, and an eye is depicted on it, this eye is ninety percent similar to human beings, flat up and down, the corners of the eyes on both sides are connected with the edge of the plane, up to 10,000 meters, and in the middle is a pupil that is as red as fire, lifelike.

The diameter of the pupil is 3,000 meters, as if it is composed of condensed red energy, and at first glance, it looks like a star!

Everyone in the falling Federation was shocked, and somehow, looking at this eye from a distance, everyone had inexplicable palpitations in their hearts, as if this eye was alive, and its pupils could turn, looking at themselves.

The distance is getting closer and closer, and this eye is rapidly enlarged in front of it, and the feeling is getting more and more terrifying.

After a few moments, he finally reached the bottom of the giant cavern, slowing down and levitating in mid-air five kilometers away from his eyes. The light brain shows that everyone has fallen 700 kilometers in the giant hole, that is, this is located 700 kilometers underground, and even gravity is only two-thirds of the ground!

Looking back at the entrance of the cave from here, it was so dark that I couldn't see it anymore.

Everyone looked down at the platform below in amazement, especially the huge eye, and when they got closer, they found that the pupil in the middle was actually a complete red crystal, translucent, and the energy inside could be vaguely seen flowing, looking like a star in continuous fusion, dazzling and magical, most of the light here was emitted from the pupil, illuminating the bottom of the giant hole.

The lines depicted as the eyes are ravines up to 100 meters deep, and there is nothing else on the platform beyond the eyes, just an empty square.

After observing from a distance for more than ten minutes, all kinds of detection methods did not find any useful information, whether it was the pale golden square or the pupil crystal, it was unprecedented, and I don't know why.

This is obviously the architectural remains of suspected super civilization, but when it came to the end, everyone was frightened, and no one dared to land down to contact it.

Everyone remembered clearly that before coming down, a fragment of a battleship weighing several hundred tons fell in.

However, no debris was found in the metal square within a radius of 10,000 meters, and even if it melted and disintegrated, it should leave a little residue, but not to mention the residue, not even the dust could be found, and the material weighing hundreds of tons disappeared without a trace, which is absolutely strange.

"What the hell is this square, and this eye? What does it do? ”

Everyone was curious, but they were helpless, all the detection means carried by the armor were useless here, and the things in front of them were far beyond the scope of common sense, and they didn't even have a clue about guessing.

"Look closer."

The three generals and warlocks quickly made a decision, controlling the armor to slowly fall, and the metal square grew larger and larger in the field of vision, and it was impossible to see the whole picture, until it was only a hundred meters away from the square.

At this height, it can be judged with the naked eye that the circular square with a diameter of ten kilometers is indeed made of some unknown metal, and the huge red crystal seems to contain extremely high heat, but in fact it is not hot at all, the closer it is, the lower the temperature, and it seems to absorb all the heat around it.

"Absorb heat?"

Xin Lian's heart moved, remembering that Qi Ying said that when the stellar energy exploded, the energy entered from the hole and then disappeared, wouldn't it be absorbed by this crystal?

Six stars erupting at the same time, what a terrifying amount of energy, enough to melt the entire surface of the planet, this crystal can absorb it all, and it happens every 53 days!

"This is supposed to be an energy-harvesting device."

Xin Silent secretly guessed, but after the energy was collected, where was it sent? Is the bottom of this crystal connected to other structures, and what you see in front of you is only the tip of the iceberg, could it be that a larger man-made structure is hidden deep underground?

It's not just him, others are guessing about the same.

Zhuang Xiaolin said loudly: "Spread out, look everywhere for any passages or entrances, pay attention to maintaining the height, and don't go down to contact the ground of the square for the time being." ”

"Okay."

Everyone immediately scattered in all directions and searched in mid-air.

Xin Silence casually flew in one direction, telepathic integrated bundles of downward detection, as expected, the metal floor of the square was completely dense, there were no gaps to drill inside, and the thickness of the ground also exceeded the range of telepathy, unable to penetrate into the underground space.

But it wasn't all for nothing, and he soon made a small discovery.

The edge of the square is perpendicular to the inner wall of the giant cave, there is a gap in the connection between the two, and telepathy easily penetrates into it, although no special thing has been detected, but it confirms the previous speculation, this square is far more than 10,000 meters in diameter, the specific size is unknown, and it is hidden behind the inner wall and extends out I don't know how far!

A group of people searched several times, but found nothing else, and regathered together to discuss for a long time, but to no avail.

Finally, several strong men decided to send people down to get close to the square.

A mercenary of Zhuang Xiaolin's absolute henchmen stepped forward, and in the eyes of everyone, he slowly landed, and at the moment when his feet were about to touch the ground, the eye in the middle of the square burst out with a dazzling red light, instantly drowning everyone in mid-air.

The light contained the traction of Pei Modang, making people unable to move, like insects in amber, watching themselves being sucked into a gate of light that was generated at some unknown time, and their eyes were dark, and they could no longer sense anything.

"I'm not going to die like this, am I?" This was the only thought in Xin Leng's mind.