With a "bang" sound, this person's body fell on the aisle on the second floor. In such an empty space, the echo is very loud, as if the sound is coming from the ear.

The aisle, which had already been rusted, was still able to walk, but such a person and equipment of nearly two hundred pounds fell heavily on it, which also made it unable to support it all of a sudden, and the pieces were broken. There was about a meter or so of a steel bar on the left and right of the aisle, which was directly broken off by this person, falling straight down and falling to the ground, raising a large piece of dust, and also causing a bigger noise.

And that person also fell down with this piece of steel bar. Although the dust blocked everyone's view, it was almost certain that this person would not have any hope of being alive nine out of nine.

Everyone could clearly hear the curses of the group of people on the other side, and the oncoming bullets became more ferocious, pressing back the offensive of their counterattack at once.

Yang Hao's side has also been taken care of a lot. His position is the farthest position from his companions, and it is relatively exposed, unlike other people, who can attack by sticking out their heads, and this door is also completely within the other party's field of vision, so Yang Hao has no way to find a suitable counterattack opportunity, and can only hide it completely in the opposite firepower, so as not to let the other party have a chance to hit him.

The others, at this time, had no better chance to attack, so they could only dodge as before and wait for the opportunity.

But it didn't take long for the offensive from above to suddenly stop.

Although I don't know what happened, but such a good opportunity. Of course, everyone will not let go, and after the other party's fire stopped, all of them did not need to be reminded, and all of them came out and began to shoot at each other.

Along with the sound of gunfire, there were screams one after another. But it was these screams that made everyone stop firing.

If you hit them yourself, then these screams are too abnormal.

In such an environment, due to the memory of the echo zài. Any sound becomes very clear. At this moment. Everyone could hear it clearly, and it was not just one or two, but all of them who were screaming, and it seemed that they were all in great pain. Under night vision. The above situation can also be seen clearly.

All of them had already thrown their guns at their feet. Covered his mouth. Or choke his neck, but the painful sound still popped out of his throat. The voice was even a little distorted.

Seeing their appearance, everyone began to feel a little uneasy, and even their faces changed slightly.

The situation in front of us makes everyone scratch their heads at all. Enemies who were fine one moment are all like this the next. There were no other enemies around, what made them like this?

At this time, the screams of a person suddenly disappeared, and then a large amount of blood spurted out from between the fingers covering his mouth. His eyes widened, and he slowly fell to his knees, his body falling to the ground.

Not only his teammates near him, but even Zhang Tianhai and others were also surprised.

"What happened?" Zhang Tianhai immediately shouted to the people next to him.

All of them looked at their surroundings and tried to figure out what was going on like this.

The people above vomited blood one after another, and the death came very suddenly, as if there was an invisible killer next to him, slowly approaching him. This feeling of the unknown is the most annoying and frightening.

At this time, Mu Xi, who was looking left and right, suddenly stopped.

Her eyes gradually lost focus, and all her attention was on her ears.

Her hearing was the best, and at this time she heard a very strange sound.

If I had to describe it, it was like the sound of a balloon slowly leaking. In such an environment, she couldn't find out where the air leak was, but it was basically certain that the culprit who caused this qiē might be here.

"Something is leaking!" Although he couldn't find this place, Mu Xi immediately shouted loudly.

At this time, the last enemy above had also vomited blood and died, and the corpse fell from above, falling to the ground with a "bang", stirring up a large cloud of dust. In the entire space, only Zhang Tianhai and others remained, still standing on the ground.

"Air leaks?" When Zhang Tianhai and the others heard this, they also paid attention to this.

Eight people searched at the same time, and soon, they found the place that Mu Xi said.

This is also on a tank as big as a boiler, with two bullet holes, which should be the traces left on it by the strafing of these people just now. Thanks to the dust raised by the person who fell down at the end, the air there became extremely turbid, and such air flow, under the vigorous movement of the dust, was clearly seen by everyone, otherwise the clarity of the vision brought by the night vision device alone would not be able to see the situation here at all.

Seeing this, Zhang Tianhai's face changed.

It turns out that there are still things in these tanks. And looking at the gas spewing out of it, there are quite a few things inside.

It is now almost certain that it was these gases that caused the mysterious deaths of those people. These things are probably poison gas, otherwise they wouldn't have made those people so miserable, and they wouldn't have died so quickly.

Gas...... If it's poison gas, then you'll soon be in trouble. This thing doesn't distinguish between friend and foe, and if you inhale these poisonous gases, you'll end up like those people.

But now I'm fine, which proves that the situation is not irreparable. Zhang Tianhai instantly came back to his senses and shouted: "Poisonous gas!" Put on a gas mask! ”

Such an unknown military facility, poison gas or something, must also be within everyone's consideration, and the necessary gas masks must also be there, and they are hung on their bodies. It is not necessary for Zhang Tianhai to remind, everyone is not stupid, in this space, except for their own people, the only thing that appears is the unknown gas that leaks out of the storage tank, so ninety percent of the deaths of those people are caused by these gases, so what are these gases, do you still need to explain?

All of them immediately squatted down, took out their gas masks, lifted their night vision devices, and put them on their heads.

After losing the night vision device, the surrounding area became invisible, but the sound of air leakage seemed to become clearer. This made everyone's hearts start to become more panicked.

I don't know what kind of poison gas these poison gases belong to, you must know that some poison gases, even with gas masks, are useless, they will enter the body along their own skin, or they will directly start to invade from the epidermis. Now that I am fine, I must explain that these poisonous gases are lighter than the usual air and will float upwards, so the first to suffer is the enemy standing on it. But this space is limited, and sooner or later the poisonous gas will float down, and at that time, it will be time for you to suffer.

All of them turned on their flashlights, which gave them some extremely narrow visions. Yang Hao also turned on the flashlight and shone it in everyone's direction: "Hurry up!" ”

All the people followed Yang Hao's light, ran to Yang Hao's side quickly, got into the gate one by one, and then rushed to the front like a desperate one.

Opening the doors one by one, several people ran forward frantically. Everyone didn't know how fast the poisonous gas behind them was spreading, but everyone thought that the place where they came in, and the two doors that the other party entered, were not closed.

Since it is not closed, then in these places, there will be air circulation, which will accelerate the spread of poison gas.

I didn't look like I was like those people, so I had to run forward desperately.

But after running for such a long time, there is no reliable gate in front of me. These doors are all very ordinary doors, there is a gap in the middle, these doors can not bring everyone a sense of security, forcing everyone to continue to run forward.

Finally, after about ten minutes of running, I finally ran into an iron gate in front of me. Everyone was overjoyed, such a door must be completely closed, as long as they get to the other side of the door, the poisonous gas here will not affect themselves.

Gavin began to speed up, reaching the door first, grabbing the iron ring on the door, and twisting it to the side hard.

The people behind him gradually rushed over, and they all stretched out their hands to grab the handle, twisting them to the side hard.

It seems that it has been a long time, the lock has been rusted, and everyone has tried their best, but they can't get this handle to turn even a little. All of them used their strength to feed, gritted their teeth, and the sound of trying their best was squeezed out between their teeth. Behind him, the night meteor, Mu Xi and the others could only keep cheering, but they were also sweating in a hurry, and there was nothing they could do.

"Click......

A slight crisp sound appeared in everyone's ears.

A little rust fell to the ground on the rusty gate.

Everyone was overjoyed.

Where the rust has started, it has begun to loosen.

"Keep it up!"

Gavin shouted loudly, and everyone was motivated.

The rust on the door kept falling, and finally, the handle was completely twisted by everyone, and the rusty iron door was finally opened by everyone.

Everyone pushed the door open and rushed in, and then several people closed the door again, locking it shut.

"Poof!"

All of them sat down against the wall, gasping for air.

Yang Hao and Jiawen also slowly slid down against the door, staring blankly at the front, and kept panting. (To be continued......)