Because of the structure, the ventilation duct is quite close to the sound, and the slightest wind and grass cannot hide the deaf and eye-catching insects, which were close to the pipe wall, and suddenly heard a slight vibration from the pipe wall.

At that time, the turtledove was lying there muttering something to herself, it could not be the movement he tossed out, and judging by the distance of the vibration, the little insect was also sure that the turtledove was not joking with herself, so she simply put her ear to the wall of the pipe, and instantly heard the sound that had just flashed in her ear more clearly.

It was the sound of some kind of creature with claws, crawling rapidly through metal pipes, and it was really afraid of something.

"Run."

The turtledove gave a look to the turtledove that had not yet reacted, and then immediately got into a ventilation duct first, and the turtledove blinked twice, although he didn't quite understand what the turtle heard, but looking at the expression of the turtledove, the turtledove knew that it was definitely not a good thing.

The space in the ventilation duct is too small, and neither the insect nor the turtledove can be used in such a narrow space, and the turtledove can't even straighten his waist, and if he encounters a difficult subject, he can't go up and stare the other person to death with his eyes.

As for the little worm, she has a little more room to play than the turtledove, but in such a narrow space, the wall of the ventilation pipe is made of metal, and the little worm has to try to avoid shooting, because if the bullet hits the pipe wall, the trajectory of the ricochet is unpredictable, and it may bounce on her or the turtledove.

So while there is still a chance to escape, of course, it is to escape quickly.

……

I don't know what is on the other end of the pipe, its speed in the narrow pipe is actually a lot faster than the turtledove and the worm, at first the worm needs to put her ear on the wall of the pipe from time to time, to be able to hear the movement behind, how long has passed, she doesn't even have to listen deliberately, she can feel that the thing behind is getting closer and closer to herself and the turtledove.

"What the hell crawls so fast?"

At this point, the turtledove finally understood what was going on, and he kept looking back behind him while crawling forward behind the worm's ass, and after a while, the turtledove saw a black shadow, approaching him at a very exaggerated speed.

They have a dark-skinned complexion, a hairless body, and a slight resemblance to the humanoid monsters of the "A1" type, but their joints are very different from those of humanoids, so they cannot walk upright like humanoids, but instead crawl on all fours.

Brutal and agile by nature, they are the same low-level test subjects as the humanoid monsters, but they are classified as "B" type test subjects, creepers.

"It's a 'B1' type test subject," the worm is now more inclined to call the scientific names of these test subjects, "no wonder it can crawl so fast in a pipe, it turns out to be a creeper." ”

If this is left outside, no one among the creepers, turtledoves and insects will take it seriously, but who wants to be inside the ventilation duct, as the saying goes, "people under the low eaves have to bow their heads", these two people in the ventilation duct can't even stand up, and they can only climb to move forward, which can be regarded as low enough.

Now that he knew that it was a "B1" test subject chasing after him, the little worm was not as flustered as he was at the beginning, and the turtledove was also much calmer after seeing its true face, and he and the little worm stopped running for their lives, and simply stopped where they were.

They wanted to see how much of a splash such a creeper could make.

……

As soon as the turtle dove and the insect stopped, the "B1" test subject, which had been crawling happily, suddenly became a little unsure, and gradually slowed down its progress, and looked this way for a long time.

The two people in front of them were looking at the "B1" test subject, and the "B1" test subject was also looking at the two people in front of them, and the three pairs of eyes looked at each other again and again, but they still didn't see why.

Suddenly, three pairs of eyes became four pairs of eyes.

Another "B1" subject came out of nowhere, poking its head over the shoulders of the "B1" subject at the front, staring at the panicked turtledove and the bug with its eyes unblinking, and its mouth moved, and it was unclear if it was exchanging information with its companions.

Immediately afterward, a fifth and sixth pair of eyes appeared, and more and more "B1" subjects chased after them, gathering behind the first "B1" subject.

……

"Are we breaking into the den of thieves?"

The little worm wondered why there were so many "B1" test subjects here, but she thought about it a little and suddenly realized.

It seems that not only do he and Ikaruga understand the safety of the ventilation ducts, but the "B1" type test subjects who live near the main test site do not have any advantages over other test subjects, and are undoubtedly excellent predators in the eyes of more high-level test subjects.

Thanks to the "B1" subjects' discovery of the ventilation ducts, firstly, the larger subjects could not get into it, and secondly, the "B1" subjects were naturally crawlers, and they were literally at home in the ventilation ducts.

In this way, even if a test subject of similar size to them but stronger than them happens to burrow into the ventilation duct, the "B1" test subject can use its movement speed advantage to play hide and seek with the other person in the complex network of pipes, thus avoiding the fate of becoming a meal on the plate of other test subjects.

Speaking of which, it seems that the ventilation duct is really tailor-made for the "B1" type test subject.

……

"Look, how did they spread out?"

The turtledove was not like a small worm, he was analyzing it in his head when he had nothing to do, he was paying attention to the actions of the "B1" type test subject over there from beginning to end, and the two sides confronted each other for about a minute, except for a small number of "B1" type test subjects who continued to stare at the turtle dove, and a considerable part of the remaining "B1" type test subjects suddenly turned around and left, quickly disappearing into the depths of the pipe.

"They're probably scared of us," Turtledove touched his chin and analyzed it like a worm, "If you want me to say that's probably it, they were all shocked by my domineering spirit, and most of them ran away like grandsons, and only these few were left who refused to give up." ”

After a little analysis, Turtledove felt that his analysis was quite reasonable.

"Idiot," the little worm glanced helplessly at the turtledove, "this is people's home field, they're afraid of you, those 'B1' test subjects are going to outflank us." ”