The passage is not very long, and it takes about a minute to climb like this, and you will reach the next floor. But it doesn't look like the real next floor, because the space around it is a bit small.

The space is not enough for people to stand up completely, at most it can only make people bend over and stand up, there are a lot of lines and pipelines around, and there are many roads leading to all directions.

Yes, for such a large underground base, maintenance passages are also one of the necessary facilities. If there is no maintenance channel, then the repair will be a big problem, and the wall can't be smashed open, right?

And when they entered here, everyone obviously felt a little stuffy, which proved that the ventilation here was not very good, but there was no Cheng Dù who was so strict that he couldn't breathe, and he was barely able to go deeper.

Such a maintenance channel, of course, there can be only one entrance, and depending on the depth here, eighty percent of the exits to the bottom, if you shine on this exit, you can really go down to the third floor.

Occasionally, you can see some ventilation windows under your feet, through which you can already see the dim lights below, but these windows are very small and you can't let yourself go down at all, so everyone doesn't choose to destroy them and keep walking.

There were a lot of exits on the way, but they all led to the upper floor, so everyone had to move on. The air in the passage is also good and bad, and it has gone too far. Everyone also felt a little hot, and everyone felt that their underwear was already wet with sweat, and it felt that the temperature was getting higher and higher.

"Stop!"

Mu Xi, who was in the middle of the team, suddenly said loudly. The others all subconsciously stopped.

"What's wrong?" Zhang Tianhai in front turned around and asked.

Mu Xi didn't answer him immediately, but closed his eyes. Yang Hao, who was beside Mu Xi, knew at a glance that Mu Xi might have heard something.

After a few seconds, Mu Xi opened his eyes and said to the front: "There are gunshots!" ”

"Huh?"

All of them were still, their attention to their ears.

All the energy is on the ears, and the auditory senses are immediately enhanced. Plus the absolute stillness of the surroundings, any wind and grass around it. are starting to become apparent.

All of them heard. In the surrounding air, there were indeed bursts of gunfire. But the sound of this gunshot is very small, and it can only be heard if you concentrate, and it seems to be far away. There is still a long way to go.

But that's enough to prove it. Someone has already made it to the third floor by himself. I just don't know if they're fighting the player or resisting the zombies.

Branster touched his chin and whispered, "It seems that we should be on the edge of the base." Otherwise, we would have been able to hear these gunshots long ago. ”

"Leave that alone, get out of this place and think about anything else." Zhang Tianhai said.

Of course, everyone will not have any objection to this mentions. I have been caught in this narrow passage, and I am also very uncomfortable.

After walking for a while, this time everyone's luck was not bad, and an exit finally appeared under their feet. After opening the iron plate with a little effort, the exit to the third floor completely appeared in front of everyone's eyes.

The surrounding environment is also different from the upper two floors. Compared with the upper two floors, it is more like a factory, and the ground is not a cement floor, but a steel mesh at this location.

There are also all kinds of large machinery and equipment below, and the pipes are so intricate that you don't know what they are used for. Everyone stood here and observed for a long time, but they didn't find the poison gas storage tanks on the upper two floors, which was a little relieved.

Such a large factory is also of little value to everyone, and there is an exit in a place not far away, so the team followed this exit and left this place.

There are also black marks everywhere in the corridor, which is not as clean as the upper two floors, and from time to time you can see carts on the road, as well as a lot of box fragments, guns and other things, which makes it seem that this place is relatively messy.

With a wave of his hand, the team stopped moving for a moment, and Branster tried to listen for the gunfire again.

When it was still, the gunfire on the other side became clearer, but there were many echoes in between, making it impossible for Branster to hear any more information.

But since there were people over there, he should go there and take a look, even if he got a little closer and didn't join the battle, maybe he could find something useful, so Branster waved his hand, and the team moved again.

And Mu Xi in the team frowned slightly when he moved.

Her hearing was the best among everyone, and in the gunfire just now, Mu Xi seemed to hear something not quite right.

This sound is certainly not a gunshot, and it is definitely not an explosion. However, the voice was very vague, so that Mu Xi couldn't hear what the sound was, and even made her think that she had heard it wrong.

Mu Xi's curiosity also came up, and she couldn't be sure what the voice was, so she didn't make a report, but continued to follow the team.

If you get closer, you can hear it more clearly, and by that time, you should be able to know what the sound is.

After walking some distance, the surroundings changed again.

First of all, the surrounding environment has become relatively "clean".

There were no black things, no random debris and carts, and if there was no thick dust on the ground, everything around looked relatively neat. The hallway also began to change, turning into large pieces of glass. Branster wiped the glass, turned on the flashlight and shone it in.

On the other side of the glass, there is a large area similar to the real room, on the table, test tubes, beakers and other things are quietly placed there, some have been broken, but others, after such a long time, are still relatively intact.

Farther away, there are some instruments that no one knows, no need to ask, they must be used to do something.

It seems that everyone has walked to the area of a chemical laboratory. And seeing this area, all the people understood something in their hearts.

It is estimated that the deadly poisonous gas should have come from these real rooms. After all, they are all chemical substances, and the place where this kind of thing first appeared should also be a chemical laboratory, and looking at their appearance in the storage tank of the workshop outside, you can know that these things, in fact, have been developed quite successfully, and have been separated from the real yàn room and started mass production.

It is estimated that the reason for the destruction of this place is precisely because of these poisonous gases. Just look at those zombie soldiers, it must be that there is a problem somewhere in a series of links from the real yàn room to the workshop, storage, etc., which caused the poison gas to leak, thus dragging everyone in this place into hell.

Branster shook his head slightly.

According to his opinion, this chemical reality room should not have been stored in this place. The upper two floors, one floor is the arsenal, and the other floor is the barracks and warehouses, no matter how you look at this chemical laboratory, it should not be set up in such a base. Everyone knows the dangers of chemical laboratories, especially in the field of studying this deadly toxin, and should either be placed in a largely uninhabited place, or with good and perfect protection in place. Look at this base, the above two conditions have not been met, and this place will become a hell, so that no one cares about it for decades.

For such a place, Branster couldn't arouse any interest at all, and who knew if there were more powerful and deadly things in this real yàn room, so Branster didn't choose to enter the real yàn room, but left here quickly along the corridor next to him.

And as the team gradually advanced, the gunfire in front of them began to gradually become clearer.

The echo gradually became smaller, and the gunfire began to become obvious, proving that he was getting closer and closer to the battlefield.

At this time, the strange voice in Mu Xi's ears also began to become clear. Suddenly, Mu Xi's face changed drastically, and he shouted: "Danger! There's a zombie ahead! ”

"What?" Branster immediately turned his head.

Mu Xi also covered his head in annoyance: "I heard some strange sounds just now, and I didn't hear them clearly until now, those are simply the roars of zombies!" ! Their roar is so quiet! ”

"It's too late for you to tell."

Yang Hao next to him said in a low voice.

His face was facing the back of the group, and he didn't turn his head as he spoke. Mu Xi looked in the direction he was looking at, and immediately gasped.

Behind him, about a hundred meters or so in the corridor, a zombie appeared.

The number is not one or two, look at the shadows cast on the wall, there are many more, and there are more and more zombies appearing in their field of vision.

“OHFUCK！”

Branster couldn't help but scold: "When did they run to where?!" ”

You must know that place, I have just passed by, and when I passed by that place, I didn't see any abnormalities at all, and Mu Xi was also listening to the surrounding movements all the time, and he couldn't find any traces of these zombies, which made everyone wonder why zombies appeared in this place?

Zhang Tianhai said loudly: "Now is not the time to think about this!" Everyone, run! (To be continued......)