Institute.

A secret room made of tempered clear glass. At this moment, there were more than a dozen zombies of various types locked inside, screaming and roaring at the humans who were close at hand.

"Let's get started!"

An old man with gray hair, with a serious face, commanded. Then, a short-haired beauty standing next to him activated the button in front of him.

Hiss......

In the opposite chamber, pale yellow gas is continuously blown out from the ventilation duct. The old man's eyes were solemn, and he said in a deep voice: "Qianqian, you control the time, and the others are responsible for recording the reaction of the test subject!" ”

"Hmm."

The short-haired beauty nodded. The timer is then removed. There are still more than a dozen staff members, who have begun to divide their labor and record the situation of each zombie.

"Ten seconds!"

"Subject 1 is unresponsive and has stiff limbs."

"Subject Two is starting to move slowly!"

“……”

"Subject Twelve is normal, and does not seem to be affected by the gas!"

In the laboratory, human voices are constantly sounding. One after another, report on the data situation.

"Twenty seconds!"

"Subject 1 has suffered damage to the central nervous system and is incapacitated."

"Subject 2's central nervous system is affected, and his mobility is slowed down!"

“……”

"Subject Twelve is not affected by poison gas, everything is normal!"

Five minutes later, all the data materials were gathered in the old man's hand, he glanced at it, and sighed, "The poison gas we extracted from the mutant artemisia grass is still too weak......

After hearing this, the short-haired beauty named Qianqian smiled and said, "Director." Artemisia annua poison gas can effectively kill ordinary zombies and inhibit the activity ability of first-level mutant zombies. For humanity, this is already a great invention capable of changing fate. ”

"That's right."

A smile spread across the old man's face. Then, his expression was correct, and he ordered: "Qianqian, you immediately bring all the poison gas bombs and hand them over to the military." ”

"Okay."

The short-haired beauty nodded, then turned away.

…………

No one expected that after the fire attack, it would bring such tragic consequences. The outer city wall collapsed, although the personnel were evacuated in time. The losses were not significant, but a large number of weapons and supplies were buried by the collapsed walls.

This is a heavy blow to all the survivors who are struggling to resist the tide of corpses.

Retreating into the inner city, it didn't take long for the group of black crushing corpses to rush over the collapsed ruins of the city walls.

The corpses began to attack the inner city.

The inner city is the third and final line of defense. If it can't be defended, the last homes of all the survivors of Westport City will be destroyed. Few people can escape the razor-sharp minions of zombies.

Therefore. The inner city cannot be broken, it must be defended.

At the military factory, all the explosives were made into improvised explosive packets. All the gasoline from the city's stockpiles was also brought in. Under the inner city, the sound of dense explosions is endless. The flames are blazing. The remains of zombies can be found everywhere.

With the lesson of the last time, all of the gasoline cans thrown this time are power-type evolutionaries. The oil drum was thrown 30 meters away and ignited by a sniper with a gunshot.

Under the sniping of explosives oil barrels. The zombie tide suffered heavy casualties and could not be approached. Not even throwing the same kind of thing.

But this situation lasted until about 3 p.m. Reversals began to occur. The explosives pack ran out and the gasoline ran out. The ammunition was also exhausted, and there were not many cold weapons left, such as bows, crossbows, guns, and spears.

Faced with the influx of corpses, the survivors on the city tower were reduced to the embarrassing situation of having no weapons to resist.

"Quick! Send someone to transport stones, and smash them to death! ”

Yan Jin yelled at the other end of the intercom, and the internal staff in charge of material transportation yelled.

Soon, truckloads of stones were transported to the tower. All the personnel above began to raise stones and defend the last line of defense of Xibu City with the simplest and most primitive weapons.

Stones rained down. Those ordinary zombies had weak defense, and they were hit in the head by a stone and killed instantly. But for the power zombies, it is not at all threatening.

The big guys in the corpse group began to repeat their old tricks again, grabbing the same kind of people around them and throwing them towards the city wall. This time, without guns and bullets, the few ability evolutionary attacks could not destroy the zombies flying in the sky at all.

A few seconds later, there was chaos on the walls. Screams mixed with screams were endless.

Devil Cry vines fly in the air.

Li Ba took Yang Jian and a group of evolutionaries to desperately strangle zombies on the city wall. And Ji'er, driving the big flower to swoop back and forth, constantly attacking the zombies that were thrown towards the city wall.

How long can it last?

Li Ba didn't know. Everyone didn't know in their hearts that their only belief at the moment was to hold on to the inner city and not be able to retreat even a step.

The tide of corpses is already approaching the city. After a few low roars, one after another power-type zombies began to stack Arhats again, as if to pile up meat ladders so that the corpses behind them could rush up the city wall.

"Block them! They must not be allowed to rush up! ”

Li Ba yelled. People run along the side of the city wall, and the devil crying vine is sacrificed, attacking the power zombies below like a poisonous python. The other evolutionaries also knew the seriousness of the situation and launched a furious attack.

As for the zombies thrown on the city wall, they can only be dealt with by ordinary armed men. The corpses were originally much stronger than ordinary people, and under the fierce hand-to-hand combat, the blood on the city wall was like a river, and the corpses were everywhere, and the injuries were heavy.

At this moment, Wang Feng came. There were also a dozen people in white coats. Each of them carried a lockbox in their hands, came to the city wall, and immediately took out a tube of yellow-green reagent from the box and threw it down.

Bang Bang ......

The test tube shattered, and the yellow-green liquid inside splashed, volatilizing in a matter of seconds, emitting a yellowish gas. Strange to say, these yellow gases are harmless to humans, but the corpses approaching the city wall below began to fall in pieces after more than ten seconds.

Including those power-type zombies, they are also like drunk, staggering and losing their ability to attack.

In just two or three minutes, in the urn city between the ruins of the outer city and the inner city, tens of thousands of zombies lost their combat effectiveness and fell. There are less than a hundred left, all of them are mutant zombies above the second level, and there are xenomorph zombies, which do not seem to be affected by yellow gas.

However, they were scarce in number, and after approaching the city wall, they were quickly all solved with the cooperation of Li Ba and other evolutionaries.

The tide of corpses did not retreat because of the sudden heavy casualties. On the contrary, under the low roar of the Corpse King, the black pressure corpse group surged like a tide. However, as soon as you enter the urn city, you will come into contact with the yellow gas that rises, and it will not be long before it begins to fall in pieces. What seemed to be a fierce offensive was easily disintegrated.

"Qianqian!"

Li Ba walked briskly. A group of white coat personnel led by Wang Feng just now, Ding Qianqian was among them.

"Brother Li."

Ding Qianqian greeted with a smile.

"What is this? It's so powerful! ”

Li Ba looked at the yellow gas that filled the urn city, and his face was full of amazement.

"Artemisia poison gas!"

Ding Qianqian knew everything. She told Li Ba that this is a poisonous gas extracted from a mutated plant by the institute, which is harmless to humans, but highly toxic to zombies, which can erode their nerve centers and incapacitate them.

"It's a pity that this poison gas has not been fully developed, and it can only be effective on zombies below the second level."

A flash of regret flashed on Ding Qianqian's face.

"The most terrifying thing about the corpse tide is the huge number, and a small number of high-level zombies are not a big threat to us." Li Ba said in a deep voice. The poisonous gas of yellow artemisia is extremely lethal to ordinary zombies and first-class mutant zombies, if there is enough poisonous gas, let alone defending the city, it is possible to destroy the entire corpse tide! ”

Wang Feng, Yan Jin and other high-ranking military officials came over. Nowadays, there is a defensive barrier formed by the poisonous gas of Artemisia annua, and the tide of corpses basically comes and dies as many as possible. The few remaining high-level zombies do not pose much of a threat to the city wall.

As a result, all of them have a relaxed smile on their faces.

"The number of this mutant artemisia grass is scarce, and it is extremely difficult to cultivate it artificially."

Ding Qianqian's next sentence made everyone's mood extremely heavy, "The astragalus poison gas currently refined by the research institute has been taken out, and there is no inventory. ”

Li Ba looked at the yellow smoke rising from the urn city, as well as the corpses rushing straight one after another, and asked, "How long can this yellow artemisia poisonous gas last?" ”

"An hour."

Ding Qianqian replied very simply.

"In an hour, at the current rate, it should be able to kill nearly 100,000 zombies."

Wang Feng said slowly: "From yesterday evening to now, we have eliminated about 200,000 zombies, counting the 100,000 heads that can be killed by the yellow artemisia poison gas, and the number of corpses eliminated can account for about three-fifths of the entire corpse tide. ”

"In other words, there are about 200,000 zombies left." Yan Jin said. Looking at it, everyone's faces were full of solemnity.

200,000 zombies, if there is enough ammunition and firepower, it is not too difficult to deal with it. However, now Xibu City has run out of ammunition, and there are not even a few crossbow arrows left. wants to use human flesh and blood to fight against the corpses, and the result can be imagined.

"No matter how difficult it is, we have no room to retreat, only to hold on!"

Li Ba looked at all the military high-ranking officials, and said slowly: "Order to recruit men from the city, we must be prepared for hand-to-hand combat." (To be continued......)

PS: Hey, it was sealed inexplicably, and it hurt that the land had no mind all morning, and there was not a word. Now it's finally solved, cheer up, work hard to code words, come to the first change, ask for support...... (The mm brother below, uh, recharging seems to be very simple, so try to support it if you can subscribe.) ）