"boom!"

He just casually clicked on the trap ground outside the cylindrical metal prison, but who would have thought that the entire prison would shake!

"Boo!" Keke jumped onto his shoulders twice, screaming in fear, "Boo?! Boo!"

It seemed to sense some danger and looked very panicked.

"What happened?!"

"Earthquake?!"

"Go back quickly!"

In the corridor outside the door, the voices of Wen Guixin and the other two came from the depths, and hurried footsteps were heard.

But what made Xu Xin feel strange was that despite such a big commotion, the giant insects and beasts in the prison outside did not make any movement at all.

Even the one or two cries that could be heard from time to time were gone!

They all seemed to be afraid and didn't dare to make a sound at all.

What is going on?

what happens?

At this moment, something unexpected happened on the screen.

He saw that the originally flat ground outside the prison where he had just clicked suddenly deformed!

The part he clicked suddenly sank downwards, while the circle around it began to bulge upwards and gradually wrapped around the middle!

That's right, the ground seemed to open a big mouth at the place he just clicked, and wanted to swallow everything on that place!

Damn, the ground is alive!

Moreover, it is possible to control deformation by using screen tension?!

What kind of creature is this thing?!

At this moment, the deformation of the soft ground outside the prison suddenly became faster. In an instant, the big mouth suddenly closed, and the entire ground quickly returned to flatness.

But at this moment, the vibration under his feet became even more violent!

At the same time, he heard a voice.

“————”

A particularly low and frightening voice clearly reached his ears.

“————”

His brows furrowed suddenly, his breathing became heavy, and he felt dizzy, nauseous, chest tightness and shortness of breath.

This was the first time he had heard such a voice. It was too low and too uncomfortable!

“————”

Xu Xin covered his mouth, suppressed the dizziness and nausea, and reached out to hold on to the wall.

It hurts so much!

"Oh oh!" Coco became even more flustered. She dived directly into Xu Xin's arms and began to tremble.

Xu Xin held Ke and slowly sat down against the wall.

He opened his mouth and breathed in deep gulps, his breathing was extremely rapid, his head felt like it was about to explode, and his internal organs seemed to be under attack.

It hurts so much!

Is this the sound?!

What a terrible sound!

This sound is coming from... underground?!

...He seemed to have guessed the source of the sound!

Is this... that enormous creature under the prison, screaming?!

The giant, soft creature that they had stepped on countless times was screaming!

Its cry was long and low, as if it contained strong dissatisfaction.

Fortunately, on the screen, there was nothing special happening on the ground outside, and it was still very flat.

However, because the scene on the screen is a simple linear perspective, the actual situation cannot be seen.

Finally, the sound stopped and the surroundings gradually became quiet.

Xu Xin rubbed his head, his breathing trembling slightly, and tried to calm himself down.

Coco lay in his arms, trembling slightly and letting out a muffled "嘤..." sound.

"What happened, Brother Xin?!"

Zhao Xiaochuan rushed into the control room first.

He was so fast that he ran back ahead of the two men.

His face was pale at this moment, and it seemed that he was also affected by the voice just now.

Xu Xin stood up, leaning against the wall. He rubbed his still dizzy head, pounded his heart, which seemed to be a little slower than before, and said, "I'll explain it after they arrive. How are you? Did that sound just now have a big impact on you?"

"Sound? What sound was there just now? But just now I suddenly had a headache and felt nauseous, and my body felt uncomfortable everywhere." Zhao Xiaochuan swallowed his saliva and then dry heaved. "I suddenly felt very uncomfortable, and I don't know why..."

Xu Xin was slightly stunned and asked, "Didn't you hear the sound just now? It was like the sound of some creature screaming."

Shouldn't it be?

Even though he had amplified hearing, the sound was still very loud.

Even without hearing amplification, they should be able to hear sounds of that size, right?

"Ah? What creature is making that sound? No?" Zhao Xiaochuan shook his head in confusion, then rubbed his head and said, "I really didn't hear anything."

"But you feel uncomfortable." Xu Xin raised his eyebrows slightly and asked.

"Well, it's just... suddenly feeling very uncomfortable?"

Xu Xin took a deep breath.

This sound definitely exists.

As for this sound, only he could hear it, and Zhao Xiaochuan didn't hear it...

He probably knew why.

Perhaps it is because this kind of sound is something that ordinary people cannot capture under normal circumstances.

Infrasound!

Infrasound refers to sound waves with a frequency of 0.0001hz-20hz.

The human hearing range is 20-hz.

This is a sound wave beyond human hearing!

As for why Xu Xin could hear this voice...

Because he now has hearing enhancement!

The hearing enhancement even expanded his auditory frequency range!

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