If the Theory of the Hollowness of the Earth is correct, there is indeed an inner space beneath the earth's crust, and there may be more than one layer of the inner world.

So why hasn't there been any sign of other civilizations underneath the ground for so many years?

Is it because like humans, they can't penetrate the thick crust at all and enter the underground world, and underground civilizations can't penetrate the crust and enter the surface world?

In other words, the creatures of the underground civilization are actually the same as humans who cannot adapt to the underground environment.

They also can't adapt to the climate, air, and environment on the surface, so they have never come out, and only occasionally send exploration ships out to wander around to do research?

It has been speculated that a mirage is a projection of energy particles that projects the environment of an unknown region into Earth's space in this way.

So is it possible to make a bold guess that the mirage is actually a projection medium formed by some kind of energy particles in the underground space, which leak into the surface space through some cracks in the earth's crust?

In fact, many things in this world cannot stand up to in-depth scrutiny.

Although some bricks call the beast to say that the mirage is nothing more than an optical refraction phenomenon.

However, many people don't notice that those brick houses ignore the importance and ignore the heavy ones, and many of the scenes in the mirage cannot be found on the earth at all, and some are even ancient pictures (such as the Viking picture in the Aegean Sea and the ancient woman picture in Penglai).

With modern technology, there's no reason why you can't find prototypes of buildings in a mirage, right?

But the problem is, you can't really find it, and it's not like a mirage with automatic mapping and imaging, creating a function that doesn't exist in a building, right?

How can this be explained? Time travel, space overlap, parallel space?

No matter how puzzled, Zhang Xu and the others finally caught up with the Yanhuang team of the second echelon against the dinosaur group against the current, while the other party was guarding the exit of a giant underground hall, fighting fiercely with groups of dinosaurs.

Unexpectedly, it was not only the Yanhuang clan that stayed in this giant underground hall with a length and width of more than two hundred meters and a height of about tens of meters.

The Dark Devil Clan, which is the first echelon, is actually here, obviously blocked by the dinosaur legions that are surging from other underground halls deep underground.

Compared with the poor battle mode of the SE team, the battle mode of the Dark Devil team and the Yanhuang team seems to be a bit limitless.

The more than 1,000 warriors of the Yanhuang clan were divided into two teams of more than 500 people, who were stationed on both sides of the exit of the giant underground hall, and used quantum transmission to summon a large number of thick and heavy alloy horses and deer bars, and surrounded several layers of defense near the exit to defend against the collision of large dinosaurs.

In the center of the two positions on the left and right, there was a passage sprinkled with large three-edged ground thorns.

The gap between those sharp triangular spikes was enough for small units like the Velociraptor and the Swift Dire to pass safely.

However, it makes it difficult for large dinosaurs and large dinosaurs to pass through, severely slowing down their movements, and causing them to be killed by attacks from both sides.

Since this kind of underground hall is often built on the nodes of ancient underground tunnels, in addition to the exit to the surface that Zhang Xu and the others entered, there are also multiple tunnel openings leading to other places deep underground.

A large number of dinosaurs and dinosaurs poured out of these tunnel mouths, pushing and shoving the dinosaurs and dinosaurs in front of them one after another, and they could only bury their heads and rush forward.

Theoretically speaking, it is impossible for more than a thousand soldiers of the Yanhuang clan to withstand such a large-scale charge of the dinosaurs.

But the problem is that, in addition to their own combat power, they are also assisted by various advanced equipment, such as an octa-clawed machine that looks like a large steel spider.

Zhang Xu has seen this thing, and he heard from his buddies in the Yanhuang team that this thing is called the "Greedy Wolf Tyrant Spider-X" firepower platform.

Dozens of "Greedy Wolf Storm Spider-X Type" lined up behind the alloy horse rejection defense line, and on the back of the body supported by eight thick mechanical limbs and legs, eight "honeycomb magnetic rail ejectors" are spraying a storm of light mist of superelectromagnetic metal particles at a crazy rate of fire of "32 million rounds per second"!

The armed dinosaurs that rushed towards the metal horse defense line, even the large dinosaurs wearing alloy heavy armor and energy shield generators, were directly blasted back as if they had crashed into an invisible wall.

As for those small and medium-sized dinosaurs, they are simply like bugs on the front windshield of high-speed vehicles on the highway, directly "snapping" and exploding into a cloud of flesh and blood mist.

What's even more terrifying is that next to each "Greedy Raptor-X", there are four five-meter-tall humanoid mechs to protect the safety of the firepower platform at any time, preventing those large dreadful lizardmen from remotely projecting energy spears to destroy the firepower platform.

Zhang Xu, who finally rushed into the underground hall, was dumbfounded, thinking that they had crossed into the battlefield of the future war.

And the members of the Yanhuang clan, who found that their small team had broken into the battlefield, also moved a row of alloy horses and let them into the position.

Several warriors who looked like future soldiers, dressed in mysterious black individual armor, greeted Zhang Xu with a smile and greeted him.

"Damn, you ......"

Zhang Xu looked at several familiar members of the Yanhuang team, and he didn't know what to say.

Looking at the black technology armor on other people's bodies, and then looking at the metal protective armor on their bodies that are the same as primitive people, it is simply self-ashamed.

But who calls people have a background?

"Confidentiality, you know!"

One of the Yanhuang warriors pointed to the "Greedy Wolf Tyrant Spider-X" and the humanoid mecha.

The members of the SE clan nodded hurriedly, these things must be high-level equipment that the Dark Magic official has not yet opened to the player class, right?

Because of the fierce battle, several Yanhuang soldiers didn't have time to chat with them, and after telling them not to step out of the defense line, they hurried back to their combat posts.

And the people who charged against the current this way were really tired, hiding in the safe environment behind the position, while bandaging their wounds to recover their injuries and physical strength, while secretly observing the battle situation.

But it didn't matter what I saw, I was startled by the scene on the battlefield.

In the underground hall that was almost crowded with all kinds of armed dinosaurs and dinosaurs, there were more than 100 warriors who directly rushed to kill in the dinosaur tide, and they were the bosses of the Black Devil team!

The jaws of the SE team members who have never seen this kind of scene are about to fall off, this is too hardcore, right?

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