At this moment, both Lu Tianyuan and Lin Ruoxue were stunned, this is clearly the path that should not be chosen!

However, trust and their own discipline made them not say much, and they didn't even hesitate for a minute, so they rushed over, followed Jiang Xian's figure, and stepped into the loudest area together.

The credit knife man and Chen Shiyun only followed, and they did not fall behind in the slightest.

The moment he stepped into the passage, the sound suddenly became extremely violent, and Jiang Xian's ears were filled with a strong rumbling sound, almost deafening his ears.

The sound of humming and electricity echoed in his ears, and his brain was a little dizzy, but his steps did not stop, and he continued to take three or five steps forward, even if the loud sound seemed to be not far ahead.

And in the middle of these three or five steps, the loud roaring sound suddenly disappeared.

No, not gone, but reduced.

And it was so small that it was about the same as the buzzing sound in his ears, as if most of the sound had been absorbed.

Before he could finish his thoughts, a huge tremor suddenly came from behind him, and even the ground under his feet trembled!

Jiang Xian's footsteps slowed down, and he turned his head sharply, looking at their original entrance behind them, which had been blocked by a huge stone.

No, it's not just the entrance.

He shone the flashlight forward along the irregular stones, only to see that there were stones behind the stones, and countless smoke and dust flew and fluttered from the cracks in the stones, like fierce ones, surging in all directions.

"Such a sound, such a shaking formation, is definitely more than a boulder." Lu Tianyuan next to him blocked his ears and said with a solemn expression: "I'm afraid that the intersection where we stayed before was covered with stones." ”

The few people next to him all looked moved, and they were just about to speak, when suddenly a vibration came from the surroundings again.

Rumble——!

The sound of the impact suddenly sounded, and the walls around him trembled, and dust fell one after another, as if a huge monster was violently hitting the huge rock that blocked the intersection.

The impact was non-stop, the sound continued, and the fluctuations surged and spread around, and the sound seemed to hit the heart, so that everyone did not dare to relax.

"Voice...... Lin Ruoxue's ears moved slightly, and her complexion changed suddenly: "The loudest collision is from the area where the black dead butterfly is located just now!" ”

As soon as the words came out, everyone's faces changed in unison.

"This sound and this vibration can only be caused by the strength of at least a dozen tons, or even more than twenty tons......" Chen Shiyun's face showed a look of horror, and then he was full of joy, he didn't think that anyone present could deal with a monster with such terrifying power.

If you really rush into the seemingly safe Black Death Butterfly Channel, there is only one ending-

Die!

"Picked up a life...... "The face of the person with a credit knife changed under the hood, if it weren't for Jiang Xian's leadership, they would really be able to rush into that seemingly safe road, and the consequences can be imagined.

"Strange ......" Xue Rong frowned on the side: "Obviously, we heard that these roads had walking sounds before, and we even felt vibrations, why did everything change when we got here?" ”

"The most dangerous road becomes the safest, and the safest road becomes the most dangerous ......"

Lu Tianyuan and Gu Mingrui glanced at each other, and the two of them were also surprised.

"It must have something to do with the arrangement in this cave." Jiang Xian stepped aside and lightly touched the wall with his fingers: "Didn't you notice that this passage is not the same as our previous passage?" In particular, these walls. ”

Well?

Everyone was immediately interested and looked towards the wall next to them.

The passage was wide, about the same as most of the passages in the Shadow Cellar, and the pillars stretched straight on either side of the passage.

However, there were no lamps above these pillars, and there was no light shining on them.

Some of them are hideous beast heads. They have their mouths open, baring their sharp teeth, and they have an incomparably fierce and fierce aura. A sense of blood came over the surface, as if he had just come out of the herd.

This kind of sculpture technique, which is full of barbaric characteristics, makes it clear at a glance that the people of the credit knife man and others are building it by the people of the original "plate".

On both sides of these pillars, the walls that spread forward were quite different from the walls of the passage that preceded them.

There are no bricks, no tiles, no rest. The walls, which obviously have traces of artificial casting, have countless holes, densely arranged, like countless honeycomb ant holes.

Seeing this wall, Lin Ruoxue's eyes flashed slightly, and she followed Jiang Xian's side, her fingers bent, gently knocking on the wall, and her ears trembled slightly.

The extremely subtle sound entered her ears, and her eyes showed a look of thought, and then the flashlight shone along the holes, and a look of horror suddenly flashed on her face, and she couldn't help but take a half step back.

"What's wrong?" Jiang Xian on the side immediately supported her.

"It's fine." She shook her head and looked at the crowd around her, "I think I know why the voice suddenly decreased." You've all heard of the acoustic wall, right? ”

"Acoustic wall?"

As the name suggests, the sound-absorbing wall is a kind of wall that absorbs sound, using the fluctuating nature of the sound itself, so that it is consumed in the process of continuous transmission and reflection, and turned into heat energy, and many buildings have used this principle.

The sound-absorbing wall has dense small holes, and the inside is as sparse and soft as a sponge, which can produce the effect of sound absorption.

He looked at the holes on the left and right and above, and then looked at Lin Ruoxue: "You mean...... Is there a sound-absorbing wall inside this wall? ”

"That's right." Jiang Xian raised his head and looked at the man with the sword: "Do you remember the deafening sound when we first came in?" But after walking for a while, the sound suddenly decreases, and then the further you go, the quieter it becomes. ”

"I remember very well that the walls were smooth and sealed for the first part of the passage that I first entered."

"The sound can't disappear suddenly, it's getting smaller and smaller, it can only be absorbed, or it's cut off by a vacuum."

"It's impossible to create a vacuum here, but the holes in the walls and the internal structure are very similar to the acoustic walls."

"But......" Gu Mingrui looked around with some doubts: "Although the sound-absorbing structure can indeed reduce the sound a lot, but the level of sound just now, those attraction devices can't do this, right?" ”

"A promising detective once said that when all possibilities are ruled out, the rest is impossible, and it is also a fact."

Jiang Xian's face was serious, and he didn't make any strong words: "Moreover, all kinds of situations in the shadow cellar show that it cannot be judged by common sense here." ”

"Perhaps, the original Rongwu people, or the 'plate', had the kind of excellent sound-absorbing material that we didn't find, and then cast it with the wall?"

"Your guess is probably right."

Lin Ruoxue opened her mouth coldly, the flashlight shone into the wall, turned her head behind her and said, "Look here, look carefully." ”

Everyone stepped forward, followed the light, and looked at the hole in the wall, just a glance, the cold hair all over the body suddenly rose, the heart instantly jumped to the throat, the pupils suddenly contracted, and the arm holding the weapon was directly raised!

In the dark holes, there were green eyeballs.

These turquoise eyes followed the light and followed the holes to stare at them!

"No...... Lu Tianyuan took a step back and said suddenly: "That's not an eyeball, the real eyeball is not like that...... It's a plant! It's a plant that looks like an eyeball! ”

Lin Ruoxue watched the movements of several people, doubts flashed in her eyes, and then nodded: "That's right, it's a plant." There are many plants in nature that can cancel noise, such as grass trees, metasequoias, and dragon cypress...... All have this effect. ”

"I'm afraid the plants inside also have this effect, or even stronger. When the Rong Wu people built this place, they fused those plants with this wall. The use of the holes and the sound-absorbing effect of the plant itself creates this sound-absorbing channel. ”

"I see......"

The man nodded, and his flashlight shone at the hole next to him in turn: "That's right, every hole has these plants, it seems to be ......"

Well?

Lin Ruoxue's expression changed suddenly: "What did you say?" What plants can you see in every hole? ”

"That's right." The man on credit looked at her strangely: "What's the matter?" ”

"When I looked at it, I could only see it in the depths of some holes." Lin Ruoxue's face tightened: "If you don't even look carefully, it's hard to find those eyeball-shaped plants...... But now ......"

The plants are stretching out here!

Everyone was suddenly terrified, and just as they were about to act, a thin sound of Si Xi Suo suddenly came from the surroundings.

They hurriedly turned their heads, only to see that among the holes, one after another the turquoise "eyes" stretched out, "watching" everyone.

Left, Right, Top...... Countless turquoise eyes emitted a ghostly light, and the cold aura spread from the surroundings, and the shadows swayed and changed with the movement of the eyeballs, as if the overwhelming ghosts climbed out of hell.

Fear crept up into the heart like a substance, even if everyone present was a bold person, at this time, a chill continued to pour out of their hearts.

"Let's go!"

Jiang Xian quickly came back to his senses, and suddenly shouted in a low voice: "If you stop here again, you will be overwhelmed by them!" ”

"Gotta rush out before they cover all the area!"

This sound immediately brought everyone back to their senses, and they immediately strode forward.

Although I don't know the specific abilities of these plants, with all the previous experiences and these oozing pupils, no one will be naïve to think that they are harmless. Even because of the characteristics of the plant itself, it is even more terrifying than those huge monsters!

The only fortunate thing is that these plants don't move very quickly.

But unfortunately......

I don't know how long this sound-absorbing passage is, but in front of them, the "eyeballs" that flicker with a ghostly light are slowly spreading, covering the entire passage!