Although the number of these monsters is twice as large as that of the crowd in terms of human heads, in fact, these seemingly ferocious monsters are not so difficult to deal with.

If compared to the mutants outside, the strength of these monsters is only around the fifth order, and it is not even comparable to the tyrants that Yan Zhengfeng encountered before.

Therefore, even Zhao Yi and the others didn't make much move, Yan Zhengfeng quickly solved these monsters alone, but after the battle, Yan Zhengfeng did not let go of his heart.

I just came in and encountered such a monster, and I didn't know what danger would happen when I walked backwards.

Perhaps in response to him, or because of the sound of the previous fight, the room in the corridor ahead resounded with an undulating roar.

Looking at the dense room, several people's backs were a little cold, so many rooms, if there were monsters in each room, how terrifying the number of monsters should be.

"Is there only one way to get to the back?" Yan Zhengfeng frowned and took a step back, looking at the turbulent metal door, he had the intention to retreat, but he didn't know the route here, and he didn't dare to move around at will.

Li Ying nodded, and replied a little helplessly: "I only know this one, as for whether there are others, I don't know, after all, this place is too dangerous and complicated, and it was a fluke that I was able to enter here in the first place." ”

"Then there's no choice but to wait for the monsters to come out and kill them all." Yan Zhengfeng held the dagger in his back and looked ahead with unblinking eyes.

I don't know how many monsters there are in the institute, and maybe there will be more advanced ones than what they have encountered now, but if they want to get in, they can only take this path.

In fact, Yan Zhengfeng didn't blame Li Ying for not knowing other routes, they didn't encounter any resistance since they entered the research institute, until they came to this corridor.

If he wasn't mistaken, it should have been that all the defensive forces of the institute were deployed here, because this was the only road to the rear.

Moreover, even if the actual situation was not the same as his guess, then the other reasons leading to the rear would certainly not be much better than here, and the Institute had already made full preparations before they came.

The only way to get through here now is to follow this path until the end.

Li Ying didn't know what Yan Zhengfeng was thinking, so her tone was a little worried: "Actually, we can exit here, and if we want to go back, we don't have to go through these pipes, although the defense system of the institute is very perfect, but we can also find a way to destroy the metal wall and penetrate it." ”

Yan Zhengfeng grinned and looked at the gradually shattering metal gate: "No need, they won't give us a chance." ”

Li Ying did not continue to answer, but focused her attention on the front.

"Bang!"

In a few moments, several hideous claws came out of the room, followed by a lizard-like head.

Creepers.

Yan Zhengfeng knows this kind of monster, and he has fought with these monsters when he was at the base before, so he is also very familiar with this kind of monster.

However, these creepers didn't seem to be the same as the normal mutated creepers, their eyes were not as scarlet as the creepers Yan Zhengfeng had seen before, but black, no different from humans.

And these creepers are much smaller.

"Roar!"

When the creepers came out, they roared in all directions, as if to tell of the depression of being locked up in the laboratory, as if in response, and the monsters around them who were destroying the metal door also roared angrily.

The roars grew, undulating on each other, and as the metal doors were breached, more and more creepers crawled out of the institute.

When these creepers came out, they did not attack everyone immediately, but walked slowly around them, as if waiting for their companions, but more like they were playing with their prey.

In just a few breaths, all the metal doors were fully opened, and the entire corridor was filled with creepers.

Li Ying frowned, and roughly counted, there were at least forty or fifty heads, this is just this corridor, as for whether there are other monsters inside, no one knows.

Subsequently, she saw Yan Zhengfeng rushing forward and starting to kill.

……

……

In fact, the individual strength of these creepers is not very strong, at least not comparable to normal mutated creepers, but their advantage is in numbers, monsters of the level of creepers are very common in the end times, but here, all of them.

Yan Zhengfeng held the bone dagger and inserted it into the heads of the creepers, stirring vigorously to destroy their brains that should have died, but his killing didn't seem to have much effect.

These creepers are not controlled by their brains, and even if their heads are cut off, they can still attack freely, which is an unexpected accident that immediately makes several people fall into passivity.

But he quickly reacted, and the black gas in his hand covered the dagger, tearing the huge creeper in front of him to pieces, only to get a little respite.

"Just rush over there, don't wait too long here." As if he had thought of something, Yan Zhengfeng didn't dare to hide anything anymore, and directly shot with all his strength, and a circle of black energy visible to the naked eye was wrapped around his body.

It suddenly occurred to him that the reason why the institute had arranged so many monsters was perhaps not to prevent them from going to the inner courtyard, or was it to stall for time?

Otherwise, it would be impossible for the personnel within the institute to come forward until now, and even the soldiers like last time have not seen it, which can only show one thing, from beginning to end, the purpose of the institute is to abandon these monsters and drag them down, and the personnel of the institute must have another purpose.

Thinking of the traces found at the entrance before, Yan Zhengfeng frowned, he always felt that things were more unpredictable, if it was just to change a base, then how could the institute not evacuate for so long?

It's just research equipment or something, and you don't need to transport it for a few days, so to speak...... They must be waiting for something!

As for what it is, Yan Zhengfeng doesn't know, but it will definitely not let them succeed!

……

……

With all his strength, these creepers in front of him were no longer enough to pose a threat to him, and after Yan Zhengfeng eliminated the creepers, he moved forward at full speed along the long corridor.

It seems to be aware of the crisis, and there are constantly monsters rushing out of the passing laboratory, some are creepers, some are even unrecognizable to him, as several people go deeper and deeper, more and more monsters gather around them, and the level gradually begins to rise.

After about ten minutes of advancement, Yan Zhengfeng came to the laboratory where he had talked to Dr. R before, and it was only here that he saw the only 'person' he had met since entering the research institute.