The helipad on the rooftop.

  The area is only a dozen square meters, but it is one meter higher than the entire rooftop.

  At this moment, this small apron is the safest haven for Tianxia and others.

  To get here, Tianxia and his team traversed the entire Future Research Institute, stirring up hordes of zombies on every floor, who were now rushing towards the helipad in a daze.

  "Hold on, our helicopter will arrive in half an hour!"

  Captain Raymond cocked the M4A1 and gazed out at the zombies swarming onto the rooftop, urging them on.

  "Don't worry, we will definitely survive."

  Tian Xia also said seriously.

  At this time, the zombies on the rooftop sniffed out the scent of Tianxia and others.

  The sunken eyes flashed with ferocity again, and these zombies dragged their bodies and rushed over.

  The final battle has begun.

  Tianxia and others hold guns and open fire in retaliation.

  All the zombies in the building gathered on the rooftop.

  Densely packed and pitch black all over.

  Their bodies had already rotted, saliva dripping from the corners of their cracked mouths, as if they were starving beasts filled with a craving for slaughter.

  Gunfire echoed on the rooftop.

  The heavenly troops were divided into several groups, defending the weak points of the airport's defense.

  The apron is relatively easy to break through in several places:

  One is a staircase connected to Tiantai, which is relatively spacious and will definitely be attacked by a large number of zombies from here.

  Secondly, there is a area on the left side that is blocked by an iron wire fence. The terrain here is relatively low and zombies may be able to climb over the iron wire mesh and directly flip into the apron.

  The wreckage of a helicopter that crashed nearby.

  Under the wreckage were several charred bodies, apparently institute staff who had attempted to escape by helicopter but failed.

  The zombies can climb along the wreckage of the helicopter and jump directly onto the helipad to launch a dimensional strike on Tianxia and others.

  Tianxia and Captain Raymond guard the stairs of the town hall.

  As a direct connection point for the apron and rooftop, a large number of zombies rushed over here.

  And second-order biochemical ghosts also exist in it.

  Detection function activated, a corner of Tianxia's field of vision, a file floated out:

  Species: Bio Specter

  Rank: Second Class

  Introduction: The evolved form of a first-order biochemical specter, with various values compared to the first order, has been greatly improved, and can easily annihilate an entire mercenary squad.

  Infection rate: High, undergoes mutation within three hours after being scratched by it.

  Skill: Sprint, condenses a green whirlwind in front of him, increasing movement speed to some extent.

  Weakness: Head, Chest Energy Core

  Looking at this file, Tian Shuang deeply understood that this second-order Reincarnated Ghost was absolutely a ruthless character.

  "Captain, I'll take care of that guy." Tianxia volunteered.

  The AK-47 is tightly held in hand.

  The sight locked onto a second-order biochemical specter that was majestic in the zombie crowd, and all the bullets flew towards it.

  The second-order biochemical ghost is very fast.

  Even without activating skills, it's like a 100-meter dash.

  Many of the bullets shot by Tiān Shā were dodged, and the remaining bullets that hit only caused damage that this second-order Biochemical Ghost could withstand.

  Second-order biochemical specter shuttles through zombie groups.

  The aura emanating from his body caused the surrounding zombies to subconsciously avoid him, clearing a path.

  It's coming straight for Tianxia.

  With a single leap, the second-order Biochemical Ghost had already appeared before Tianxia.

  The black steel blade slashed down, the eyes hidden under the mask shone brightly red, even penetrating through the armor plates and seeping out from the gaps.

  Tian Xia dodged and countered with a spinning kick that landed on the Biochemical Ghost's chest.

  "Hold on, captain, I'll take care of it!"

  Tianxia looked at Captain Raymond and immediately grasped the Nepalese military knife, proactively charging towards the second-order biochemical wraith.

  "Don't worry, I absolutely won't let a zombie in!"

  The captain, Raymond, roared in anger.

  His right index finger tightly grasped the trigger, exerting all his strength to shoot and kill the zombies on the rooftop. The M16's barrel had become scorching hot from prolonged firing.

  The battle was no easier for others at the barbed wire fence and helicopter wreckage.

  This time Tianxia and his men were fighting a battle of wits.

  The rest of the rooftop has been packed with zombies, and Tian Shuai has nowhere to retreat, and can only defend this helipad to the death.

  However, at this moment, the number of zombies gathered on the rooftop is estimated to be around three or four hundred, not to mention that there are still other zombies pouring in from the entrance and other floors.

  Facing such a mountain of corpses and sea of blood, even if they were mercenaries who had grown numb to life and death, it would be hard not to feel a chill run down their spines.

  Tianxia and Erjie's Shenghua Youling are still in a fierce battle.

  Although relying on the strength of the enhancer and having this green weapon, Tiānxiāo had a slight advantage in the battle, but was still held back and unable to extricate himself.

  Hank, Lena and SEAL Team Six operative, holding position near the barbed wire fence.

  Every now and then, zombies use their sharp claws to hook onto the iron wire mesh, wanting to climb over and come in.

  Hank and his men kept firing nonstop.

  Two machine guns, the RPK and MG3, as well as an M4A1 assault rifle, all three firearms at the ready, bullets whizzing through the air to pierce the zombies hanging on the barbed wire.

  But before these zombies' bodies had even fallen, new ones were already swarming forward in their place.

  These zombies trampled on their own kind's corpses, using the bodies as stepping stones to climb over the barbed wire more quickly.

  Hank and his men were firing fiercely, but they gradually had no time to take care of every zombie.

  The withered body became agile under the drive of biochemical viruses.

  More and more zombies climbed over the barbed wire fence and stepped onto the apron.

  Although they were blown up by bullets shot the next second, it was clear that Hank and his men were about to be overwhelmed by the numerous zombies that kept coming like a landslide.

  Boom!

  Rena threw out a hand grenade.

  The explosive flames engulfed the zombies behind the iron wire fence, and the charred corpses fell to the ground, unable to get up. A gap appeared in the zombie group.

  Unfortunately, this vacancy lasted less than three seconds and was completely filled with more zombies.

  The zombies then continued their charge towards Hank and his group.

  Helicopter wreckage site.

  The spirit fox was surrounded by three biochemical ghosts.

  The M4A1 fired continuously, but it could only hold back these biochemical ghosts and couldn't completely kill them.

  After all, it's because of the weapon.

  The black-ops M4A1 is hard-pressed to breach the Bio-Spook's defenses.

  If a green weapon assault rifle is given to the spirit fox, as an elite mercenary, she can easily solve these three biochemical ghosts.

  Seth, lurking beside him, grasped an air hammer shotgun, its muzzle aimed at the direction of the helicopter wreckage.

  Innumerable small bullets scattered out, those zombies that attempted to jump directly onto the helipad through the wreckage were all shot down by the ambusher Seth.

  However, there were too many zombies on the rooftop.

  Every time they kill a zombie, three or four more zombies will immediately take their place and continue to charge forward fearlessly.

  "Ding, host killed 2nd-stage biochemical ghost X1, obtained 200 kilograms of gold, 200 evolution points."

  After nearly ten minutes of struggling, Tianxia finally killed this second-order biological ghost.

  He didn't dare to breathe and immediately raised his gun to fire.

  The zombies rushed towards the apron one after another.

  These zombies howled as if they were a devouring wave that could swallow everything.

  Tianxia and others were like a small boat on a leaf.

  At any time may be engulfed by the surging waves, can only keep struggling.

  After a long battle, everyone's bullets are almost exhausted.

  A large number of zombie corpses piled up on the rooftop.

  These mutilated corpses were infected with a biochemical virus, their green blood flowing out of the bodies and seeping into the rooftop, impossible to erase.

  The battle is still ongoing.

  These zombies seem like they can't be killed no matter what.

  At the muzzle of AK47-B, a brilliant flame spewed out continuously.

  Bullets flew out one after another, but were drowned in the countless zombies like the ocean, only stirring up a tiny and insignificant ripple.

  Tian Shao glanced at his watch, and there were still fifteen minutes before the helicopter arrived.