How vast the underworld was, Chu Feng didn't know.

Chu Feng had been walking for more than ten days and nights, and he had not seen a single living person.

All he could see was the dead things except the barren land in front of him.

All he could do was keep moving forward until he met the next living person, and he could not stop.

For this world, the unknown is far better than the known, and there are too many hidden dangers, so he must do this and meet someone who is at least familiar with this world.

Chu Feng's body was already a little mechanical and numb, he just moved forward, and he didn't even have the heart to read the book anymore, just took steps repeatedly, and kept moving forward.

When Chu Feng, dizzy and unconscious, fell headlong into a large pit exhausted, he slid down the slope of this huge pit to the bottom of the pit without even struggling.

"Phew!"

Chu Feng flipped over, spat out the dirt in his mouth, turned his back to the sky, and let out a big gulp.

His mind was a little clear, he knew that he had pushed himself too hard, his spirit was already a little unbearable, and he needed some rest to recover his spirit.

So Chu Feng closed his eyes, his breathing gradually became even and long, and he began to close his eyes and recuperate.

Exhaustion caused Chu Feng to fall asleep quickly, and this time he didn't dream, just fell into a deep darkness. In the midst of this darkness he remained quiet, quietly enjoying himself.

Until Chu Feng heard a sound of rustling footsteps.

The footsteps were soft and slow, squirming from the deepest depths of darkness.

Although he couldn't say why, Chu Feng just knew that it was not a voice from the darkness, it was a voice from reality.

If you hadn't slept too long, it would still be daylight.

There is no dead thing in the daytime, so the sound may come from a living being.

Chu Feng opened his eyes, the sky was still bright, and sure enough, it was still daytime.

He moved his aching limbs to his feet, and the slight footsteps still came intermittently, faintly, but with full attention, he could still hear it.

Chu Feng looked in the direction where the voice came from, and then he began to walk in the direction where the voice came from.

Chu Feng was not very afraid of the unknown voice, although he only heard the footsteps, he didn't feel the existence of his breath at all, which was enough to make Chu Feng have countless suspicions, but the other party was also a living creature after all—even if it would be an enemy, it would be better than those dead things who didn't say a word.

Chu Feng walked out of the big pit and tried his best to look into the distance, but at the end of his vision, he didn't see anything.

But the sound of footsteps still kept ringing.

Chu Feng was silent for a moment, then took a firm step in the direction where the voice came from, and then walked down step by step.

Chu Feng set off this time and walked for three whole days.

For three days, he could not find the source of the footsteps, but the footsteps continued to walk.

This made Chu Feng finally a little convinced, maybe the other party was not a living creature at all.

But Chu Feng continued to look for it.

On the fifth day, Chu Feng felt that the footsteps that he had always thought had never been close seemed to be very close, as if they were right in front of him, and he could see them at a glance.

Chu Feng continued to move forward, and on the seventh day, he finally came to the source of the footsteps.

In front of Chu Feng was a crack that twisted and spread for hundreds of miles, and the earth on both sides of the crack was as jagged as if it were dog's teeth, sometimes biting together, sometimes spaced for miles, revealing a pitch-black abyss, not knowing where it leads.

And the footsteps came from the end of this abyss.

Chu Feng frowned, he had basically given up hope of finding creatures on this land, so he decided to go down.

This time, Chu Feng was not prepared to dig out the foothold little by little, it was too time-consuming.

Chu Feng was ready to keep sliding down against the cliff, and every time he slipped a certain distance, he used the dragon's mane sword to fix his body, and took a short rest on the cliff wall to continue falling.

In this way, he will not run out of retreat, and he will not waste too much time.

Chu Feng took a deep breath and slowly followed the huge crack to find a suitable place to start.

Soon he found a rock wall that was not so hard but strong enough, and he slowly walked to the edge of the cliff and jumped off.

The moment Chu Feng fell into the abyss, the light immediately dimmed.

At the beginning, the scenery could still be seen roughly, but as it fell, soon everything was only vaguely left with an outline, if it weren't for Chu Feng being a monk, I was afraid that he wouldn't even be able to see the outline clearly.

Chu Feng fell rapidly in the darkness, and when Chu Feng thought that his speed had reached a limit or that he was getting farther and farther away from the rock wall, Chu Feng would quickly insert the dragon's mane sword into the rock wall, and gradually stop his body by using the resistance brought by the rock wall.

After resting on the rock wall for a while, Chu Feng readjusted the direction of his fall, and then jumped down again.

Chu Feng rested a total of sixteen times before and after.

Sixteen times later, at Chu Feng's feet, a twisted band of light appeared.

A strong light shone in through that band of light.

Chu Feng was a little surprised, but he didn't think too much about it, he just quickly stopped his figure, and then began to slowly move towards the light belt by constantly digging footholds.

When Chu Feng gradually got used to the strong light of the light belt, Chu Feng gradually saw something through the light belt.

Chu Feng saw a piece of sky—or rather, a glimmer of sky.

Looking through the colorful bands of light, he saw a sky that was indistinguishable from the sky he had seen before, and the twists and turns of the cracks tore the sky into pieces like patches that had been painstakingly patched together.

The edges of the cracks were overflowing with a variety of brilliance, and although a little dim, the sky was drenched in a brilliant painting.

Chu Feng was a little stunned, looking at the sky through the light belt, at the other end of the underground, was it another sky?

When Chu Feng came back to his senses, he suddenly found that gravity had suddenly flipped at some point, and the heavens and the earth had turned around in an extremely strange way.

Chu Feng was silent, and suddenly the sound of footsteps came again - this time, Chu Feng heard it more clearly than before, the sound was like a strange sound in his ears, so Chu Feng felt that it didn't seem to be footsteps...... It's the sound of hands scratching the wall, rustling, which makes people can't help but feel a little hairy in their vests.

The rustling sound kept ringing, the rhythm was very slow, but it was very regular, which was why Chu Feng mistakenly thought it was the sound of footsteps.

The sound made at the other end of the first line of heaven crossed the rift, traveled an extremely long distance, and reached Chu Feng's ears.

Who is this person?

Chu Feng was a little dazed, but since he had already arrived here, there was no reason to retreat.

Chu Feng continued to go upwards or downwards, and in such a world where both ends were sky, Chu Feng had also lost the concept of up and down.

Chu Feng came to the end of the huge rift, he stretched out his hand, put it on the protruding earth, and then with a force, he returned to a piece of land.

This land was no different from the land that Chu Feng had seen before, it was generally dead and silent, without any trace of spiritual energy flowing.

The world is dead to death, no matter where it is, there is no silver lining.

Chu Feng began to look for the source of the voice, but that person was not in Chu Feng's sight at all at the moment.

Chu Feng reacted quickly, that person might be in a pit above the earth, so he wouldn't appear in his field of vision.

Chu Feng sensed it very carefully and carefully, but he still didn't perceive the other party's breath - he even searched the distance within a radius of five or six miles, and he didn't see any trace of anyone moving.

Chu Feng was stunned for a long time, looking at the world blankly, listening to the sound that seemed to be ringing in his ears, a little inexplicable.

Where does the sound come from?

Is everything an illusion of oneself, but can one's own illusion guide one's own path?

Chu Feng didn't believe that this voice could be an illusion, and this voice couldn't be an illusion.

Chu Feng was silent for a long time, and then he decided to retreat back into the rift.

Chu Feng slowly descended along the trajectory he had come, his expression extremely serious.

He held his breath and listened carefully to the voice, adjusting his position on the rock face of the rift based on what he heard.

Chu Feng wanted to find three points, three points of the same size that he heard the sound, which required him to focus all his mind on hearing, because if there was a slight deviation, the final result would not be very good.

Chu Feng did it very slowly, but it was very meticulous, and when he determined these three points, the sweat was already soaking through his clothes.

The sound heard from the three points is generally of a magnitude, which generally means that the source of the sound is at the same distance from the three points - so it is only necessary to continuously expand three spheres of equal diameter with these three fixed points, and as the diameter increases, the two spheres will intersect to form a ring.

And when three spheres of increasing diameter intersect, the three rings formed will eventually intersect at a unique point, and the intersection of the three circular trajectories is the source of the sound.

Chu Feng relied on his memory of the surface terrain to quickly confirm the source of the sound.

When Chu Feng reproduced the source of the voice in his mind, Chu Feng couldn't help but shudder.

In what he thought was most likely the source of the sound, it was below the surface, and there was no pit in that place that could go that far.

In other words, the source of this sound is underground.