A horn gun pierced the girl's forehead, and in an instant the feeling of a stick hitting her head disappeared, Meng Soul sat on the ground, panting like a cow, struggling to get up, Meng Soul glanced at the girl who was stabbed to death by him and walked out.

The team members outside were all lying on the ground, all in a state of bleeding, and Meng Soul tried his best to wake up all the team members one by one.

After waking up, everyone couldn't believe that they were still alive, and at that moment just now, most of them felt that they had been surrounded by zombies, and then eaten, and had been dead for a long time, until Meng Soul woke them up.

This little bit of time made everyone scared, if it weren't for Meng Soul, they would all die here, what kind of monster is that girl?

Liu Yun wiped the blood on her face and walked to the room where the girl was, and looked up, the sign on the door said "Pediatrics", the girl lying on the ground had a big hole in her head, the skin on her body was pale, she was wearing a white dress, and she was holding a dirty rag doll in her hand, if she didn't look at her face, she would be a twelve or thirteen-year-old girl, but half of the skin on her face had disappeared, revealing her teeth and facial bones, the bones were not the white of normal people, but the black bones of zombies, The hole in the head was also bleeding black blood, and this zombie seemed to be a new breed that needed to be pulled back for further examination.

Meng Soul found a sheet to wrap up this strange zombie and bring it with him, and everyone quickly evacuated this place that made people panic.

Back in the morgue, everyone felt exhausted, and after sitting down, they felt that they no longer had the strength to stand up, and they all had a headache, Miao Zifang took a few painkillers by himself, and distributed the painkillers to all the team members who had been to the second floor, everyone ate hastily, leaving a few people to guard, and they all fell asleep, even Meng Soul felt very uncomfortable, and said hello to Li Ke and fell asleep.

Early the next morning, Meng Soul woke up and still felt dizzy, the zombie girl yesterday caused a great impact, many people woke up dizzy and nauseous, the original plan could only continue to be postponed, everyone stayed in the morgue for two days before gradually relieving, Liu Yun and Miao Zifang were not idle in the past few days, the two of them carefully examined the zombie corpse, and when they peeled off their coats, they found that the girl was covered with bite marks, the muscles on the inner thighs had basically been torn off, and there were tears everywhere in the chest and abdomen, In the end, the two found something different in the girl's throat.

After cutting the throat, the two found that there was a strange organ inside, after the research and demonstration of the two, it was the infrasound waves emitted by this organ that almost killed everyone, many animals in nature can emit ultrasound, but there are not many that can emit infrasound waves, elephants communicate through infrasonic waves, and generally infrasonic humans can't hear it, but after research, infrasonic waves can kill people, so many countries have begun to study infrasonic weapons.

"Infrasound waves can resonate with human organs, causing a sense of terror, chaos, and even stopping the heartbeat, and infrasound waves with a frequency between 7 and 8 Hz are very dangerous, because 7 Hz is exactly the frequency of the brain's alpha rhythm.

If the frequency and intensity of infrasound waves are controlled within a certain range, they can become non-lethal weapons that can be used on the human body, which can not only make people upset, dizzy, nauseous and vomiting, but also make them delirious and crazy, thus losing their combat effectiveness.

Sound waves with a frequency of less than 20 Hz (Hertz) are called infrasound.

Infrasound waves are not easily attenuated and are not easily absorbed by water and air. Infrasound waves, on the other hand, tend to have a very long wavelength, so they can diffract around some large obstacles.

Infrasonic waves of certain frequencies are easy to resonate with human organs because they are similar or even the same as the vibration frequency of human organs, which is very harmful to the human body and can cause death when dangerous. ”

Liu Yun told Meng Soul and the others about the results of the research, and everyone was a little dumbfounded, if there were more zombies of this kind, everyone would have to die, and they couldn't prevent it at all.

Liu Yun pushed his glasses and said: "According to me and Miao Zifang's speculation, this kind of zombie should only appear in a specific environment, at least you haven't seen it before, this kind of zombie is best killed directly from a distance, don't get close, and this organ, it should be able to study something." Saying that, Liu Yun took out the organ dug out from the zombie's throat and said.

"Let's not think about this thing for now, our goal is basically accomplished, and we can return with some medicine......"

Before Meng Soul finished speaking, there was a sudden burst of gunshots and explosions outside, everyone immediately stood up, Meng Soul made a quiet gesture, the first to climb up from the secret passage, Li Ming, Instructor Ling and others followed, everyone arrived at the main building, quickly went up to the platform on the fourth floor, and looked out, Force IV was no longer in its original position, not far from the hospital gate, there was a group of militants driving a large number of armed pickup trucks were attacking Force IV, the pickup trucks were modified, and heavy machine guns were driven in the body of each car, There were also people next to him who carried 40 fires and constantly fired at Force IV, and seven or eight rockets emitting white smoke flew towards Force IV, "Boom, boom, boom! "All of the rockets hit their targets accurately, completely blocked by the dust and bone fragments kicked up by the explosion.

"Hahaha! It's so vulnerable, it seems that the back hand of the military advisor is useless! The militants shouted and shouted.

As the rain of dust and garbage settled, the figure of Force IV reappeared in front of the group.

Completely different from what these militants thought, although these rockets hit the target, the Force IV did not suffer much damage at all, except for some scratches on some armor pieces and a face of dirt, the Force IV was not damaged at all.

The cheers of the militants immediately stopped, looking at the force IV who shook his head and began to stride towards them, all the militants shouted and began to retreat, the heavy machine gunner's continuous fire caused only bullets to fly sideways, all the bullets hit the force IV except for sparks on it, none of them can break the defense, although the force IV is said to walk, but the stride of the two legs is too large, one step against the ordinary people several steps, basically its walk is equivalent to the speed of ordinary people running.

This group of militants fought and retreated, Force IV was hit by this group of people roared again and again, although the bullets could not break the defense, but a large number of bullets hit it still played a role in slowing down its speed, Force IV finally simply raised his arm directly in the face and began to rush forward.

"Where are they going to lead Force IV?" Li Ming turned his head sideways and asked Meng Soul quietly.

"Just now they said that the military division still has a back hand, these people should just want to lead the force IV to the back hand, but I don't know what their back hand is, Doctor Miao, are these people the gangsters you said?" Meng Soul looked at Miao Zifang, who had just touched him and was lying beside him, and asked.

"Well, these are the people who got some weapons out of nowhere." Miao Zifang gritted his teeth and looked at these militants, looking eager to go up and eat their flesh raw.