The voice was so sharp and loud that it sounded like it was screaming in front of my own head.

The two of them stopped their bodies in an instant, cold sweat broke out, and their spines were cold.

"Liu Xiao, did you hear that?"

"Shhhh

"What direction?"

"Right behind you!"

"What's that? Don't scare me! You're going to lose me, you know? ”

"I really didn't scare you, but if I really lost you, I couldn't help it."

"Damn, you're always saying bad things! Hurry up and be on alert, I'll turn around and take a look. ”

Liu Xiao began to face the enemy in an all-round way, and all the weapons were quietly opened.

Fang Han turned slowly, turned around, the camera was aimed at his back, and the sonic weapon was fully released.

Indeed, as Liu Xiao said, the voice just now was indeed coming from behind him.

Upon inspection, a huge beak is revealed in front of the camera, which indeed looks like a crow's mouth.

But it didn't move.

"Wouldn't it be possible for such a big mouth to make such a sharp sound?"

Liu Xiao also hurriedly looked at it, this was indeed a head poking out of the cliff.

But he didn't have any eyes or nose, just an open mouth.

"Could it be that this is a big bird, and it was a small bird just called?"

The two of them quickly let go of the detector, but there were no other creatures in the entire mountain stream, and they were currently moving up from here, and the whole thing was quiet.

"Did this thing fly down?"

It was at this moment that the screen showed that there was a ripple whistling from inside the huge mouth.

And it was at this time that both of them heard the sharp and frightening sound of birds.

However, this ripple is invisible when it reaches the edge of the bird's beak, and it is only after it comes out that everyone can hear the sound.

"Sonic weapons? Liu Xiao, from the root to the edge of this bird's beak, the attack of sound waves is from strong to weak, and the drop is very fast, the innermost can almost shatter the steel plate, but the outermost is just sound! ”

The two felt that this was completely unreasonable, so they were naturally even more afraid.

I wanted to enter this huge bird's beak, but I couldn't grasp the rules of this bird's call, and I was accidentally shattered by the sound wave, which was really troublesome.

So the two of them were ready to move on.

But the two of them had just dived for a second, and their legs had already touched the ground.

At this time, the two of them dared to test the world under their feet.

In fact, the two wanted to test the following before, but the two of them had the same idea even if they didn't communicate, that is, they didn't dare to test.

On the one hand, they are afraid to see what they are afraid of, and on the other hand, they are afraid that their testing instruments will be discovered by the unknown.

At this time, to test what kind of abyss this is, this is obviously just a wide pit.

And this huge beak is only one, and it is next to two people.

In other words, if you want to find out again, you can only enter this bird's beak.

So the two discussed it again, and finally turned on the protection of the mecha to the maximum, and then rushed into the bird's beak together.

I didn't dare to detect it before, but now when I come in here, it turns out to be a huge passage.

The surface of the tunnel is full of greasy black substance, which looks like the surface material in a coal mine.

But the two of them thought they were all slimy swamp objects on the surface.

It's all rotten from broken leaves that look like they've been rubbed very sticky.

After going down the passage and turning a few more times, I finally came to a slightly larger platform.

The platform is about the size of the tunnel outside.

However, the two of them did not stand on it, because from here there were other small passages besides the main passage, which could only accommodate one of them.

It looks like a small heart, because the gas in it is in two states, one is invisible vapor and the other is visible condensation.

And there is a pattern, moving forward and backward.

Some entered the passageway, and some just wandered back and forth in the space.

Just as the two of them were about to go any further, all the gas suddenly erupted from all the passages, then collided on the platform, and finally emitted from the largest passage.

Then the two of them heard the sound of the birds.

At this time, the two of them realized that the bird call in this channel could have so much energy, and it was very likely that a relatively large range of crustal energy was emitted with the help of this single platform.

The old man felt that no matter where the holes were interspersed, they might all belong to the same place.

"Shall we flip a coin again or a random number?"

"No need, let's go to this hole in front of us!"

The two of them went down the cave one after the other.

At this time, the two of them realized that the black substance on the wall had turned into a hard shell.

There is no more damp and disgusting feeling, but the color is really not flattering, much like in the toilet.

After about half a minute of sliding, both of them were in a balloon-like space.

And this balloon gets bigger and smaller at one time, and it looks like a person's lungs, constantly vibrating regularly.

"Is the whole planet a giant living entity?"

When there was this speculation, the two of them were even more afraid, didn't they just go to the body of this huge creature at this time?

"Whatever, it's all here anyway, let's move on!"

There was only one hole directly in front of them, the opposite of the platform they had encountered earlier.

So the two of them didn't think about it, and just went on.

This time it was quick, and after only a short slide, it fell into a huge cavern.

Everything I had seen before was dark, but there was a faint light here.

And this is very serious, so big that there is no edge in sight at present.

"Could it be that this planet is double-layered? The outer layer surrounds the inner layer? ”

"Wait for me to test!"

As soon as the two of them tested, the speculation turned into a fact, and the planet was indeed double-layered.

The place where the two of them slid down was one layer, and now there is another layer below the cave, which is the surface.

No living creatures were found on the surface, but the temperature rose to 10 degrees Celsius.

"I thought it was a ghost star, but it turned out to be just the most normal planet."

But it was at this time that the ground beneath his feet began to move, and it looked like it was alive.

And it was going to a specific place in a circle, and the two of them hurriedly chased after it.

Eventually, the circles reached a fixed location, a small platform with a manhole cover above it.

On the lid are two big words: Forbidden Land!