After seeing these small footprints, while admiring Li Nan's subtle observation, everyone also raised the weapons in their hands to be on guard, after all, no one wanted to be bitten by mutant zombies that could be invisible.

For everyone's safety, Li Nan hurriedly ordered: "Everyone gather here with me, form a circular formation to defend the outside, and shoot immediately if you find any abnormalities!" ”

In general, the military is used to use infrared equipment for thermal detection against stealth enemies, but now everyone has to face a group of walking dead who have lost their lives, and it is obvious that there will be no heat emitted.

Chris held an electromagnetic gun on guard and asked Li Nan, "Li, do you have any countermeasures to deal with such an invisible enemy?" ”

After Li Nan glanced at the environment on this floor, he nodded and said, "In a hurry, I only thought of two ways to deal with it for the time being.

"What?" Chris said in surprise.

In fact, not only Chris was shocked, but even the other elite team members and soldiers who heard the conversation between the two of them were also surprised.

In the face of the mutant zombies hidden nearby, everyone could be said to be at a loss except for the worries and fears in their hearts.

And Li Nan in this predicament, not only did he come up with a way to fight the enemy in an instant, but even two ways, such a strong contrast made everyone feel that their brains were in vain, no wonder General Smith and Ida would like him, a civilian, to be the captain.

Then Li Nan softly explained to everyone the two methods he thought of in a hurry.

One is to break all the glass, so that the mutated zombies in the stealth will step on the glass shards covering the ground when they move and make a sound.

The second way is to break the automatic fire sprinklers on the ceiling, and if you're lucky, you'll be sprayed with a large amount of water, which will also reveal the invisible enemy.

After listening to Li Nan's words, Chris and the others turned their eyes to the sprinkler head on the ceiling.

The underground structure uses a closed fire sprinkler system.

When the temperature of the sprinkler reaches 68°C, the chrome plating on the sprinkler head melts, and the water in the pipe is automatically sprayed under the action of the roof fire water tank, so the sprinkler head will also be sprinkled with water if it is broken directly with a gun.

"The first method is more suitable for situations with fewer people, after all, more than a hundred people are gathered here now, and there are too many noises, so choose the second option." Chris suggested.

Li Nan also agreed: "Well, I also think the second way is better. ”

After the two informed the elite team of Pierce and Sheva, who had better marksmanship, everyone assigned their respective areas of responsibility, and at the same time aimed at the sprinkler head on the ceiling and began to shoot.

As the gunshots continued, a large amount of clear water sprayed out of the fire sprinklers, and the entire floor seemed to be shrouded in a light rain, and not far from everyone, seven or eight humanoid objects about a meter tall were also revealed in the water.

"Fire! All fire! ”

The soldiers who were arranged in a circular defensive formation, after hearing Li Nan's loud order, did not hesitate to shoot fiercely at the few blurred shadows blocking the flow of water, and several grenades were also thrown out.

The invisible zombies sent by the enemy, which can move fast and be invisible, can be said to be the best assassination masters, but unfortunately, they met the brainless Li Nan, and he also has more than 160 soldiers equipped with advanced weapons in his hands.

When the soldiers in reality attack, it is definitely not like some brain-dead film and television dramas, everyone is chasing a target and shooting brainlessly, they will block the direction that the target may escape while shooting at the enemy, plus the range grenades thrown out, these mutant zombies who lose their stealth effect and are not very high in defense are all killed in an instant.

After the mutant zombies who were killed lost their ability to become invisible, they finally revealed their original appearance, and these eight zombies were all children about seven or eight years old.

Li Nan came to the side of a zombie that had been killed, and saw that the little girl was wearing a cute white dress and small red leather shoes, and couldn't help but show anger.

Originally, Li Nan was very sympathetic to that crazy arms dealer Glenn, after all, his beloved wife, family and friends were all killed by the U.S. government on the day of the wedding.

Li Nan was originally forced to come to this world to complete the survival mission released by the system, so he has always tried his best to separate himself from the people and things in this world, and not use any feelings.

But at this time, seeing the zombies that those children on the ground were infected and turned into, his mind changed, since Glenn had lost all the bottom line of being a human being and attacked these children, this beast like him should not live in this world at all.

In fact, it wasn't just Li Nan who thought so now, everyone looked at those little corpses silently, and the flames of anger surged in their hearts.

Li Nan wiped the water from his face and said loudly: "After confirming that all enemies have been cleared, immediately continue to search for the entrance to the next floor, let's speed up and try to kill that bastard Glenn as soon as possible!" ”

"Yes!" Li Nan said everyone's thoughts, and everyone responded loudly.

It may be because it is difficult to mutate into this kind of zombie with invisible ability, so the number is not very large, and after eliminating these eight zombies, everyone has not encountered any danger in this level afterwards.

It took more than ten minutes for a team of soldiers to finally find the passage at the northernmost end of the floor, and after Quint's inspection, no traps were found in the corridor, and everyone came to the next floor smoothly.

In the following process, Glenn, the madman who has not shown his face, adopts an elite raid tactic, and he will send one or two zombies on each layer that are not too many, but all have special abilities.

For example, demon zombies who can use firearms and cooperate; Screaming zombies that can shatter human eardrums at close range; There are also bone knife zombies with two arms that have turned into sharp blades.

These strange and special mutated zombies brought a lot of 'surprises' to Li Nan and the soldiers.

With excellent equipment and a more united team that gradually ran in, Li Nan led everyone to kill all the zombies they saw, and continued to advance to the floors below.

When the team had just reached the forty-fifth floor, Li Nan, who was standing at the entrance, had a cautious expression on his face, waved his hand and ordered everyone to stop and defend in place.

No one blamed Li Nan for making a fuss, because after everyone saw the facilities on this level, they probably guessed what kind of enemy they would encounter.