Chapter 1 Ear-splitting Roar

Boom boom boom!

The deafening sound and intense explosion illuminated the dim space as bright as day.

Ding Zhensi, in the pilot seat of the Kui Niu mech, frantically pressed buttons, controlling the power thrusters to spew fierce flames, propelling the mech to twist and turn through the space. Simultaneously, the mech's shoulder-mounted miniature rocket launchers fired continuously, launching miniature missiles.

Too many, there were simply too many.

Everywhere he looked, the landscape was covered in grotesque, gigantic spherical monsters.

They drilled out from the ground, from cracks in the walls, surging toward the Kui Niu mech. Even from the vault above, spherical monsters fell continuously, forcing the Kui Niu mech to fly at full speed, dodging and weaving at high velocity.

These monsters ranged in size from fifty to a hundred meters, with weaponized limbs growing from their surfaces. They were numerous and fast, each possessing attack power and defense comparable to a Lv20 transcendent.

A single miniature missile was useless against them; only several missiles hitting the same spot in quick succession could tear through their surface defenses, causing substantial damage as large amounts of translucent fluid poured out.

Fortunately, to prepare for the Siming battle, the Special Affairs Bureau's equipment R&D department, much like European heavy industry, had collectively upgraded the mechs, stocking them with enough space storage items and missiles to last.

As long as he was cautious and didn't allow himself to be engulfed by the ocean of leukocytes (white blood cells), the Kui Niu mech could still rely on its high mobility and pinpoint destruction to break through the blockade.

"One hundred and twenty meters ahead, leukocytes are falling from high altitude; the mech's propulsion system is automatically avoiding them."

"A-series missile launcher is empty, automatically reloading ammunition."

"A forked road has been detected eleven o'clock ahead. It is speculated that the current location is the lung - bronchus - bronchiole - alveolus. The optimal escape route to the venous capillary has been formulated."

The mech's intelligent AI continuously broadcast real-time battle conditions in his mind without pause. A virtual compass was automatically projected onto the cockpit display screen.

Ding Zhensi followed the direction indicated by the compass and accelerated, his mind racing.

The speed of normal human blood circulation is actually very fast.

When the ventricle contracts, arterial blood containing more oxygen and nutrients reaches the capillary loops of all parts of the body through the aorta and its various branches, exchanges substances and gases, becomes venous blood, and then flows back to the right atrium through the various veins. This entire process of systemic circulation,

Regardless of whether the location is the toe or the finger, takes an average of only 23 seconds.

However, this "giant" with a body the size of Earth does not follow this timing.

Judging from the blood flow rate detected by radar, the giant's systemic circulation time is approximately 40 hours, and the pulmonary circulation requires 17 hours.

The Kui Niu mech's current location is the pulmonary alveoli,

Which means that even if he enters the pulmonary vein now and boards the pulmonary circulation high-speed train, it will still take half the pulmonary circulation time, or 8.5 hours, to reach the heart.

"There are now two options. One is to enter the capillaries through the alveoli, then enter the pulmonary veins, and reach the heart through the pulmonary circulation.

The second is to break away from the pulmonary circulation system, drill out of the blood vessels, and head directly for the heart—the Kui Niu mech has an underwater propulsion system that allows it to travel at high speed in liquid environments like a cavitation torpedo. Taking a shortcut might be faster than the pulmonary circulation route to reach the heart..."

Ding Zhensi thought quickly, "It's a pity the satellite phone communication is down for some reason. I don't know what the situation is with the others.

Otherwise, we could quickly regroup and act together..."

Tzz—

A sudden noise interrupted Ding Zhensi's thoughts.

The vast number of leukocytes around them suddenly stopped surging, and cracks appeared on their thick cell membranes, which were like the armor of tanks.

Large amounts of transparent liquid gushed out from the cracks, instantly creating continuous smoke that obscured vision.

That was... lysosomal enzymes!

"Warning, warning, corrosive vapor detected on the outer armor of the mech, current damage is 5%."

The Kui Niu mech's intelligent AI immediately issued a warning. Ding Zhensi pressed a button without hesitation, generating a layer of light blue energy shield on the outside of the mech.

But the vapor was all-pervasive, still roasting and corroding the energy shield from all angles, causing the Kui Niu mech's power to drop rapidly.

Leukocytes are not a uniform group of cells. According to their morphology, function, and source, they can be divided into three categories: granulocytes, monocytes, and lymphocytes. Granulocytes can also be divided into neutrophils, eosinophils, and basophils according to the staining properties of the granules in the cytoplasm.

Neutrophils, the massive main force, contain large amounts of lysosomal enzymes in their bodies. Usually, these lysosomal enzymes help neutrophils engulf and dissolve biological pathogens, completely decomposing bacteria and tissue fragments.

And now, these lysosomal enzymes had become corrosive vapor blocking the way forward.

"Energy shield is being corroded."

"Mech's power is decreasing, please leave the current location immediately."

The intelligent AI's warnings were incessant. Ding Zhensi roughly estimated the distance to the pulmonary vein fork and immediately concluded that he could not break out of the encirclement before the mech was dissolved.

Immediately, he controlled the mech and rushed towards the vault.

He chose the second option, breaking through the vault and entering the giant's chest cavity.

However...

Rumble!!!

The space above the vault was torn open completely. A huge monster of over five hundred meters squeezed out of the vault, and fell towards the astonished Ding Zhensi like a meteorite crashing into Earth.

That was... a macrophage!

————

The way forward was blocked.

Li Ang pushed up the glasses on his nose, calmly assessing the situation before him.

The road ahead was blocked by hundreds of terrifying monsters as large as small mountains.

They were leukocytes - monocytes - macrophages, responsible for engulfing foreign objects and dead human cells, guarding a very wide range, and were one of the most important components of the immune system.

Under normal circumstances, these macrophages are round or oval, chubby and round, and even look a bit cute, but when magnified seven million times, they become terrifying behemoths up to 500 meters tall, their bodies covered with terrifyingly shaped vesicles and tentacles.

Just looking at them could cause one's sanity to plummet.

In front of them, even the behemoths of the deep sea world seemed so small.

Shua.

Li Ang dragged a Colt revolver out of the void and pulled the trigger towards the front.

The bullet hit instantly, directly blasting a vesicle on the surface of the leading macrophage, bursting the forty-meter diameter vesicle and splashing out a large amount of liquid.

However, the macrophage only paused slightly before continuing to wave its microvilli, moving rapidly across the ground.

Like a mountain moving forward at the speed of a train.

Without fear, unstoppable, devouring everything.

This was a macrophage.