Gu Aotian and Luo Cheng continued to walk forward after changing into a new magazine, the structure of the last floor of this underground laboratory was different from the upper floor, the space seemed to have become much smaller, and they walked to a T-shaped aisle.

Luo Cheng: "Hey, where did the sound you hear come from?" ”

Gu Aotian put his ear on the wall and listened carefully: "I can't hear it, let's take a look from the aisle." ”

There is nothing unusual in the hallway, and there are four separate laboratories all the way inside, and the walls on this side are all concrete structures, so you can't see the situation inside the laboratory.

The two searched room by room, but it was empty.

"That should be over there, let's go, go over there."

The two of them went back the way they came, and then walked on.

The hearts of Robert and the three of them in front of the surveillance screen were hanging at the door of their throats, thinking that Gu Aotian and Luo Cheng were getting closer and closer to those zombies.

As soon as the two of them walked over, they saw the group of zombies still sucking blood from the aisle on the right.

Luo Cheng was taken aback: "! What's going on?! ”

Gu Aotian and Luo Chengcheng stood in place.

Gu Aotian observed for more than ten seconds, and then said after opening: "Made, no matter what the situation, fatty, fire directly!" ”

As soon as he said that, he directly picked up the submachine gun and turned on the rapid-fire mode to shoot fiercely at the group of zombies, and the thrown shells smashed into the wall on the side one by one.

Luo Cheng also raised the gun and shot for a while, but after shooting for half a minute, the two of them suddenly realized that something was wrong.

Gu Aotian stopped firing, which also made Luo Cheng stop: "Fatty, have you found out?" ”

Luo Cheng kept nodding: "Found it!" What to do? ”

"Retreat first!"

It turned out that the two of them didn't knock down a zombie in a burst of shooting just now, and the bullets did hit the zombie's body and head, although it wasn't the kind of gun headshot, but it also hit the head of a few zombies, but not even one of them fell.

At this time, the group of zombies all stopped sucking blood and turned to look at Gu Aotian and Luo Cheng, while the very eye-catching mutated zombie stood behind the group of zombies and roared, and then saw those zombies running towards the two of them.

That's right! It's running!

"Fatty! Go to the lab just now! ”

Gu Aotian shouted, and then the soles of the two of them smeared oil on the soles of their feet and slipped away, where did they come out just now, and now the two of them ran back there, and Gu Aotian locked the door with his backhand.

Luo Cheng gasped: "What the hell is this??" These zombies can run! ”

Gu Aotian also thought it was incredible, because the zombies in the outside world were all very slow, and no matter how fast they were, they could only reach the speed of normal human races, but these zombies just now could run like normal people!

At this time, there was a violent banging sound at the door of the laboratory, because there was a piece of glass on the door, just enough to see these zombies at the door, only to see that each of their eyes was pale white, there was no black eye kernel or white, the blood vessels on the surface of the body were visibly expanded, and they were still slapping and banging on the door like people.

The door of the laboratory is just an ordinary solid wood door, and according to the impact force of these zombies, it won't last long before it will be knocked open.

"Fatty, get all the heavy stuff over and block the door!"

Luo Cheng hurriedly ran over and pushed a table over, and then took a few chairs and put them behind the table, because the space of this laboratory is relatively small, so Luo Cheng put it like this, and everything can just be against the wall opposite the door.

Looking at the surveillance screen, Cheng Huan and the three of them didn't dare to take a breath, so they could only silently look at Gu Aotian and Luo Cheng in the picture, praying for them in their hearts.

Gu Aotian put on a new magazine, and at this time, he still had one submachine gun magazine left in his tactical vest.

"Fatty, we can't sit still and him!"

Gu Aotian directly raised his gun to shatter the observation window glass on the door, and then raised the distance to shoot at the heads of the zombies who were still banging on the door.

At a distance of less than two meters, every bullet of the submachine gun hit the zombie's head, and for a while, blood and flesh flew outside the door, and the right half of the face of the zombie at the front of the door was blown away by Gu Aotian, but it was still not dead, looking at the zombie's bare teeth and clearly visible broken skulls, Gu Aotian only felt that his scalp was numb and his back was in a cold sweat.

Luo Cheng: "What kind of monster the hell is this!" None of them will die! ”

The fat man saw that these zombies couldn't be killed like this, so he simply walked forward and walked up to a rifle muzzle less than half a meter away from the observation window and then shot directly to his face, the power of the automatic rifle was much more powerful than that of the submachine gun, and the zombie with only half of his face was directly broken by Luo Cheng with a gun, and the cervical vertebrae were broken, and the half of the head was drooping, but the mouth was still open and closed.

Seeing this, Luo Cheng went crazy directly, and simply stretched the muzzle of the gun out of the observation window and quickly ran out of bullets, but it seemed that only three zombies were eliminated.

Gu Aotian took over from Luo Cheng and continued to shoot, the tongue of fire tilted the bullets one by one, and at this time, those zombies were beaten straight back.

Soon both of them ran out of spare magazines.

Luo Cheng: "It's over, it's over, today I really have to explain to this underground." ”

Gu Aotian took out his pistol and continued to shoot, at this time there were more than a dozen zombies left outside the door, but Gu Aotian didn't see the mutated zombie for half a day.

"Fatty, did you see that mutant zombie?"

"Aren't these all mutant zombies in front of this TND?"

"I'm talking about the biggest one."

"Huh? I don't think I saw it! ”

Until the pistol bullets were also gone, there were still seven zombies outside the door, four of which were the last four members of the special forces, but at this time, the "boss" was still missing.

Click—the sound of an empty gun.

The ground was littered with bullet casings, and at this time, only the sniper rifle that Luo Cheng was carrying was left, five rounds of ammunition and a spare magazine.

Needless to say, Luo Cheng's sniper rifle was already loaded at this time, and the long barrel stretched out directly from the observation window, and a zombie ran over and grabbed the barrel, and then bit it directly.

"Made! I've never seen you so active in looking for death, then I'll give you a ride, fat man! ”

At this time, the long eight-fold mirror on the sniper rifle had become an ornament, and Luo Cheng directly pressed the trigger.

Bang!

The recoil of the sniper rifle is very strong, and Luo Cheng almost dislocated his shoulder by the recoil because he had not used it before.

And the zombie's head blossomed directly, like a balloon punctured by a needle, and in an instant, only a headless body was still standing in place.

Luo Cheng had already killed his red eyes and shouted: "It's really exciting!" ”

After this shot was fired, the fat man ignored the pain in his shoulder and then reloaded the bullet and wanted to continue shooting, but suddenly there was a roar outside, it was obvious that it was the mutant zombie, and then the remaining six zombies ran away.