Night, Ambrera Research Base, Detroit.

The research base is the abbreviated name of Yang Yifei and Dr. Axford, and the official name of this place is actually Ambrera Biotechnology Co., Ltd.

Located in North Detroit, it is a large campus integrating laboratories and production plants, covering an area of hundreds of thousands of square meters.

The park is so heavily guarded that it is impossible for outsiders to enter the park, so no one knows what the researchers in Ambrera are working on in the depths of the park, or what is being produced in those factories.

With this park as the center, there is hardly a zombie within a radius of 10 kilometers, so it is natural that it was led away by Ambrera's people.

After Dr. Isaacs obtained Alice's genes, he had already led the research team to the Las Vegas underground base to conduct the second phase of the Alice Project.

Today, the park is not functioning, but a team of security personnel is stationed to guard the equipment and materials of the park, kill the survivors who want to take refuge in the park, and of course, protect the park from zombies.

They also have armored vehicles, and even two transport helicopters, once they find a zombie close to a certain area of the park, if the number is small, they will all be cleared.

If there are too many, they will drive armored vehicles and even helicopters to fly in the ground and air, just like Yang Yifei and them did, to lure away the corpse tide and keep the space around the park, which is just convenient for Yang Yifei and them to infiltrate.

There are more than 40 security personnel left in the park by Ambrera, just 4 teams, there is a sentry box at the gate of the park, two stop poles are horizontal in front of the gate, there are two security personnel sitting in the sentry box, and there is a spacious duty room more than ten meters away.

There are two rooms in the duty room, the inner room is the bedroom of the duty team, which has more than a dozen beds, and the other members of the team who are not on duty sleep in it, and the outer room is the room where the security personnel rest during the day, and there is an instant messenger to communicate with the monitoring room and other teams.

The gates are on a rotational basis, with each team for a week, while the rest of the squad members live in the depths of the park, and several other guards are on duty in the depths, who are responsible for patrolling at night.

Since there is a 5-meter-high fence around the perimeter of the park, it is impossible for zombies to enter, so they are mainly in case of survivors climbing over the wall to enter.

The 5-meter-high wall can't be climbed without the help of some tools, and normal people usually don't think of climbing over the wall, because there are no zombies nearby, they can calmly walk in through the gate, ask for help openly, and then be killed by the security personnel.

So in general, the work of these security personnel is not heavy or stressful, and there will be two team members on duty on the roof at any time, day or night, to pay attention to the movement of the surrounding blocks.

They are equipped with sniper rifles equipped with silencers, and if they find a zombie wandering here, they will snipe a small number of them, and if there are a lot of them, they will notify the other squads and drive the armored car out to attract monsters.

And this is not heavy and stressful work, but they gradually lowered their vigilance, today there is a group of people who do not play cards according to common sense, do not go to the door of the guy chose to go over the wall.

……

Under the north wall of the park, Yang Yifei and his party of 14 people touched this place from two kilometers away, they were afraid of being discovered by Ambrera's security personnel, so they stopped the infantry fighting vehicle two kilometers away and chose to move over on foot.

One kilometer away, they had already used military binoculars to spot figures swaying on the roof of the tallest building in the park, and they had seen the barrel of a sniper rifle pointing upward.

So they were especially careful when moving, using the various buildings along the way to hide their shapes and break under the walls.

As for the monitoring probe or something, they don't have to think about it at all, they just need to think about avoiding the line of sight of the artificial sentry.

After arriving at the base of the wall, Yang Yifei tilted his head slightly, and whispered into the headset pinned to his collar: "Doctor, how is it?" ”

The voice of Dr. Ashford immediately came from the headset: "The system has been invaded by me, and the monitoring screen will always be kept at the same as the picture 5 minutes ago, fortunately, this base does not have the system motherboard of the red queen, otherwise it will be troublesome, in the network world, the red queen is a god." ”

In this attack on Detroit, Dr. Ashford was naturally an indispensable personnel, and because of this, Yang Yifei left one person in the chariot to protect Dr. Ashford, and only 14 people participated in the operation.

Yang Yifei said happily: "Very good, can you find the location of all the security personnel?" ”

Dr. Ashford looked at the three-dimensional image on the computer screen, showing 14 green dots and 48 red dots.

"No problem, there are 48 people in the base, and the two of them are on duty on the rooftop of the building where you are located, which is Building A3, with a total of 8 floors, and 10 people sleep in the first room on the right side of the staircase on the lower floor of the rooftop."

"Two people are in the guard box at the gate, 10 people sleep in the gate duty room, 4 people are patrolling the park, at this time they are located on the periphery of the C2 plant and are moving to the C3 plant, there are 1 person in the monitoring room, and the rest are sleeping in rooms 101 and 102 on the first floor of the B2 building."

Yang Yifei said appreciatively: "Well done doctor, we are already halfway to victory." ”

Dr. Ashford said, "Be careful, everybody, and I wish you all the best. ”

Yang Yifei said to everyone: "Everyone, I will go up from here to kill the two sentry posts on the roof of the building, you go to the gate along the root of the wall, touch the sentry at the gate, and then drive straight in, we meet in the B2 building, is it clear?" ”

"Clear."

"Good, action."

Yang Yifei arranged, then put the whispering submachine gun on his chest behind his back, jumped over the 5-meter-high wall with ease, and then quickly rushed to the building, secretly transporting the gecko to swim on the wall, and quickly rushed up the vertical wall.

Looking at Yang Yifei, who was crawling quickly on the wall like a gecko, all the team members were envious, and they all wondered how long it would take for them to do all this, they had just practiced their sense of qi, and they were still far from Yang Yifei's realm!

Alice waved to the crowd and took the lead along the wall to the gate, while the others hurried to follow.

The building that Yang Yifei climbed was more than 30 meters high, but it took less than 10 seconds, he was on the edge of the outer wall, listening to the movements of the two sentry, and one of them was breathing evenly, and he was actually sleeping, and the other was on duty.

Yang Yifei pressed one hand and two legs against the wall, pulled out the whispering pistol on his leg with his right hand, and then slammed his hands and feet, and the whole person rushed upward.

"Puff"

Two indiscreet gunshots rang out, and the even breathing of the sleeping guy lying on the recliner immediately stopped, while the other fell to the ground.

Yang Yifei kicked his foot on the parapet wall, used the light skill of King Yue's divine arrow, crossed the distance of eleven or twelve meters in an instant, grabbed the man's body when he was about to smash on the ground, and then gently placed it on the ground.

The sound of the human body falling to the ground was still quite loud, and the other members of this team were sleeping in the room downstairs, and if this guy fell down, he might wake up the vigilant people.

After killing the sentry, Yang Yifei unloaded the magazine and refilled the bullets, because the capacity of this whispering pistol was 10 rounds, and two rounds had been used up just now, but there were 10 people in the room downstairs.