At this moment, not only Song Qingxiao, but even the heartbeat of the seventh was beating like a 'dong dong' as if he was playing a drum.

Three's speed has slowed down significantly, and the smell in the air is getting stronger, and Seven should be more sensitive to this.

She turned her head, and there were strips of light on each staircase, and with the lights behind her and the light in the distance, the place was illuminated like a dream.

"Are you still in?"

The tunnel was not clear in length, and it was not known whether there was any danger ahead, and the pervasive stench and vague lack of dampness made Seven, who was in a hurry to complete the task, hesitate.

Song Qingxiao turned her head to look at her, I don't know if it was her own illusion, she always felt that No. 7's face was darker than before.

From the time she came down from the cliff until now, she had maintained her animal form, and the skin covered by her body hair seemed to grow tiny scales, evenly arranged and slightly darker.

This also made her face stiffen a little, and her lips moved as if she were a fish.

A trace of thought quickly flashed through Song Qingxiao's mind, and he instinctively remembered No. 7's palm that was scratched by a strange fish, and he couldn't help but feel creepy.

She was infected by mutated creatures, and she was afraid that she couldn't hide it, and she was afraid that others would see her weaknesses, so she maintained her bestial form.

But from the time of the injury until the morning, her changes were not so obvious, but after the beast form, the rate of genetic change increased.

Does this mean that the use of Ability Seven has accelerated this viral infection, causing her to exhibit more and more bestial mutations?

She always felt like she was about to touch a key thing at this moment, but before she could look at Seven's face and make sure of her inner guess, Seven had already turned his head away, avoiding her gaze.

"Enter."

Song Qing forcibly endured the doubts in his heart, and No. 3 was still walking forward, and had already descended to the bottom of the stairs, about to appear in front of the entrance to the tunnel.

Since she didn't stop, at least it proved that she was within the sight of Three, and she didn't see any danger.

After saying this, she clenched her dagger and slowly followed.

No. 7 gritted his teeth, squinted his eyes, and finally followed Song Qingxiao's footsteps.

The lower the stairs, the closer you get to the front of the tunnel, the more pronounced the 'knock, knock, knock' sound becomes.

The sound came from within the tunnel, and was amplified by the transmission of a long sealed passage, unknown and dangerous.

No. 3's breath stopped in front of the entrance of the cave, and without rushing in, Song Qingxiao and No. 7 went down the last staircase, stood two or three meters away from her, and also stopped.

After a closer look, this passage is about three meters high and about six meters wide, with an arc on the top of the head, and the light strips on both sides of the ground wind out, and there is no end in sight.

The sides of the passage are inlaid with black marble, which seems to be covered with a layer of tiny droplets, which reflect a crystal clear luster under the light.

On the right side of the passage is a rectangular object with what appears to be written on it, but it is not very clear.

Both sides of the tunnel are sealed, and it is clear that this is the only way out if you want to move forward.

"Look at that." No. 7 stretched out his left hand and pointed to the rectangular sign on the upper right side of the tunnel, and Song Qingxiao walked in the direction of the sign.

As soon as she moved, Seven followed.

I don't know what metal the brand is made of, inlaid in marble, it has rusted, and there should be engraved words on it, but with the passage of time, the reason for the heavy humidity in the ground, the handwriting on those signs is rusty with the brand, and it looks blurred, but it can be vaguely seen that it is a few English letters.

"F......" No. 7 took a closer look, and after scratching his hand for a long time, he reluctantly said: "It's still T......"

As soon as her voice sounded, it seemed to be sucked into the long tunnel with no end in sight, and the sound of the 'dong dong' inside sounded more urgently, accompanied by a faint echo: "It's F...... Or T? F…… Or T? T…… T…… T……”

This echo was different from the previous lab, and Seven was obviously taken aback by himself, and immediately stopped before he could finish his sentence.

Song Qingxiao stood in front of the sign, the height of the sign was just at the position of her shoulder, the rust was not light, and the letters on it had almost fallen.

There was a little space in the middle after the first letter, and only the last two letters were barely legible.

The last letter is an 'S', and the penultimate one is an 'a' or a 'd'.

But from the vacant position in the middle, the words of this sign are about seven letters, and she racked her brains for a long time, and the number seven was also thinking about it.

The existence of word cards may provide a great message to several people.

It's a pity that because the brand is very rusty, the words on it can't be seen clearly, even if Song Qingxiao deduces that this is simply seven letters, there are too many similarities, and there is no clue for a while.

No. 7 couldn't think of it, so he couldn't help urging her:

"Did you think of it?"

Song Qingxiao ignored her, but No. 3, who was locked in consciousness, relied on his own ability, did not take the concerns of the two to heart, and was already preparing to enter the passage.

After she moved, Song Qingxiao hesitated for a moment and followed.

No. 7 was still a little unwilling, but his eyes rolled, and he didn't know what he thought, so he made a few strokes in the air with his hand, and vaguely crossed the word '3'.

At this point, Seven also thought of No. Three's special ability, and had the heart to cooperate with No. Three.

But her performance was destined to be in vain, Song Qing's small eyes caught her small movements, and she sneered in her heart.

Several people entered the passage one after another, and it was already very quiet outside, but it could not be compared to the passage.

Compared with the laboratory outside, the narrow passage here seems to be a bit oppressive, and the winding passage seems to be in an arc shape, and there is no end in sight after entering.

There is no wind in it, and the cramped space is equivalent to a megaphone, which amplifies the sound of weak breathing, which is even more exciting.

In addition to the floor tiles underground, all around are covered with black marble, which seems to be a demon's wide open mouth, which is even more terrifying.

'Boom...... The sound of the ...... of the knock was still coming down, making it impossible for the three trialists in the passage to tell for a moment whether the sounds were the transmission of echoes.

The further he went, the more careful Song Qingxiao's steps became.

At this point, she had a feeling that her back was numb and she was moving forward.

At a distance of twenty or thirty meters, she seemed to have walked for eight or nine minutes.

She looked left and right, thinking about the situation ahead, and thinking about the words on the previous sign, at this time, she did not hesitate to use her spiritual power, and let it all go.

The eyeliner of No. 3 was still taking the lead, but the pace had slowed down, and Song Qingxiao's eyes fell to the left direction, and he couldn't help but widen his eyes.

After entering the passage for twenty or thirty meters, the walls on both sides changed abruptly, from the original inlaid black marble to glass, but the glass was still pitch black.

The black is different from the black of black marble, it is richer and deeper, as if you can't see it at a glance.

What is the point of making such a change in the laboratory? A doubt arose in her heart, and she felt that something had broken into the scope of her spiritual power.

It seems that a drop of water falls into the surface of the lake, making a little ripple, and the sound is inaudible, but there is no doubt about the stimulation of her.

Song Qingxiao's face changed greatly, and as far as his eyes could see, he did not find the slightest shadow of a mutated creature.

But where does this breath of life come from?

The breath came very quickly, and soon it got closer and closer, as if it was only three or four meters away from her.

Her throat was dry, her hands and feet were cold, her legs were stiff, and the direction of mental fluctuations came from the left, the direction where No. Seven was located, Song Qing pursed her lips and turned her head, but No. 7's side was a glass wall, tightly sealed, what was there?

Seven was already nervous, and the slightest movement could catch her attention.

She turned her head to look at Song Qingxiao, maybe it was the horror on Song Qingxiao's face that it was really difficult to hide, which made No. 7 feel a little flustered for no reason, and she didn't have time to ask Song Qingxiao what happened with her mouth, and there was a 'bang' sound in the direction behind her.

"I ......"

This almost scared Seven, her body trembled heavily, her long tail instinctively erected, and her face was a little distorted and deformed under fear:

"It's not me ......"