The research base is now fully mobilized and prepared as fully as possible for the battle.

There are two lines of defense in this battle, the first pass wall is not too tall and wide, and there is no intention to completely prevent the mutants from rushing into the base, just to kill as many targets as possible, and then use the open area in the basin to carry out a second blockade, and the defense line is built in a semi-permanent fortification fifty meters in front of the base building.

On the city wall, except for Qin Feng, only Li Wenxue and Kang Shuai and their respective three-person teams were left, all of them were equipped with the latest laser guns, the two rapid-fire laser cannons had already been charged, and the paired energy warehouses were all remotely controlled by Zhang Ruize in the second-line defense line.

Under the city wall, there are five first-level biochemical war beasts and two second-level biochemical war beasts on standby, these war beasts have not had time to generate autonomous consciousness due to time constraints, but there is a base intelligent brain connected through the nerve chain, although the war beast's adaptability is poor, but the overall ability can still play more than ninety percent, and it is still useful as cannon fodder. The only drawback is that it can't be too far out of the range of the brain, but it is still feasible to use it for defense.

"Captain, didn't the information you got last time say that the strength of the mutant tribe has been greatly damaged, but looking at the situation on the outside, it is more than twice as inflated as described in the intelligence?" Kang Shuai looked at the mutant crowd five hundred meters away and asked with some puzzlement.

At this moment, although Qin Feng was ready to fight, but he also had a question in his heart, Qin Feng laughed, took out a horizontal knife and wiped it and said, "You ask me?" Who do I ask? Now is not the time to think about that, let's talk about it after the war. ”

"That's right, these turtle grandchildren, see if I don't beat them up." Kang Shuai spit out the grassroots in his mouth and cursed, but looking at the laser cannon on the city wall and the biochemical battle downstairs, he was much more confident.

The mutants in the distance were already roaring, the first-level mutants were more than two meters tall and accounted for more than eighty percent, and the rest of the mutants were about two meters and five meters apart.

"Captain, what is going on with the little man in the middle, I feel that the other party is very dangerous?" Li Wenxue held the binoculars and stared intently at the strange man.

"I've noticed the one you said a long time ago, it is said that mutants are stronger and stronger, this little can't be a dwarf among mutants, right?" Kang Shuai didn't care, according to what he wanted, a laser gun shot was estimated to kill the opponent with a critical hit.

Qin Feng saw that Kang Shuai was a little overbearing, so he shook his head and said slowly: "Kang Shuai, you can look away this time, Li Wenxue feels good, this guy has the highest energy value among all people, he leaves it to me, and the rest is up to you, don't fight against this little man, if you encounter it, it's one word - run"

"I haven't seen the leader of the mutants appear, isn't this their leader? But isn't the leader about three meters tall? Kang Shuai was depressed for a while, and he wanted to kill this little man first.

"Not sure? But according to what I think, I am eighty percent sure that this guy must have gotten some adventure, otherwise it would be impossible for his power to increase greatly, and even he himself has undergone a huge change. Qin Feng saw this person with a black scarf on his face, his head revealing a messy black hair and a pair of eyes full of resentment, Qin Feng knew what this look meant—kill!

Qin Feng's fighting spirit is also soaring at this moment, and the other party has a few catties and taels Only after trying it will he know, looking at the horizontal knife full of patterns in his hand Qin Feng snorted coldly, let your blood sacrifice the innocent souls who were killed.

A thick trumpet echoed at the mouth of the valley, and all the mutants hiding in the forest were all bleeding blood, their green tendons exposed, and they all jumped out of the woods with a roar and rushed towards the city wall at the mouth of the valley, and the rumbling footsteps like heavy chariots made the earthquake tremble.

Qin Feng said slowly to the wrist-type PDA: "Fire." The two laser cannons that had been gathering momentum for a long time were the first to fire, and the energy beams ran straight towards the mutants at the front, and the plasma cannon behind Qin Feng also spit out a blue plasma ball that leaped over the city wall, and exploded violently after falling.

The second-level mutants have recovered a lot of wisdom, they always use the low-level mutants as shields, this round of blows directly killed three, and the two mutants who were injured were just first-level cannon fodder, the mutants ran extremely fast, and the explosions and the corpses of their fallen companions were only slightly hindered, all the mutants were melee types, holding giant cold weapons in their hands, just waiting for the front to break through the city gate and rush in to kill the Quartet.

"Open the door!" Qin Feng shouted to the soldiers downstairs, only to see the sound of mechanical transmission, the heavy steel gate was opened very lightly, at this time the mutant had already run out of more than half a distance in half a minute, the plasma bomb was only able to shoot three times at this moment, and the mutant must be blocked again, killing and injuring more living force, so the biochemical war beast was released.

These war beasts will be the most brave biological genes and the various mutant genes extracted after the end of the world, patchwork and fusion, completely disposable products, very defective, very short life, but as cannon fodder is enough, all take the beast body appearance on all fours, move very flexible, with sharp teeth and bone spurs, the appearance is very ugly and timid people may be directly scared to pee their pants if they suddenly see it, if it is used to intimidate other human beings, it is very competent, but mutants have no fear, This little bit of design doesn't do much.

"Keep shooting and don't stop!" Kang Shuai and Li Wenxue shot a squad that was urging them, fortunately, these were all veterans, and they could be regarded as battle-hardened, otherwise they would have been frightened by this terrifying coercion and ran away if they came up with some new soldiers.

The laser gun and the laser cannon continued to shoot violently, and the biochemical war beast also fought with the mutant at this time, fortunately, the closer the valley mouth got closer to the inside, the narrower it became, and the opponent's strength advantage could not be expanded all at once, the plasma cannon had stopped attacking, and with the progress of the underground white-knuckle battle, the casualties on both sides gradually increased, Qin Feng would not be too distressed, the materials could still be obtained in the future, and the biochemical beast could be made better if it was gone.

"Kang Shuai left a car, you quickly retreat to the second line of defense." Qin Feng looked at the scorching battlefield situation, so he issued an order again.

"Yes!" All the human soldiers retreated into the vehicles downstairs, and the knight ninety carried everyone away, like an arrow off the string under Zhao Gan's pilot.

At this moment, except for the mutant beasts that were still fighting in the distance, only Qin Feng and the two laser cannons were still shooting on the city wall, and the battle was becoming increasingly white-hot.