Lead metal is inherently soft, but when mixed with certain other types of metal, it can become very hard.

Therefore, lead alloy is a very high-quality material when making bullet warheads.

The most important thing is that the melting point of lead is only about 300 degrees, and even if Qin Fei's self-made earthen stove is used for calcination, the temperature in it can easily smelt the lead.

Qin Fei currently has a total of three guns, but he is just short of bullets.

When he escaped from Camp Whitewater, he had taken a shotgun with him.

When defending against the zombie tide before, a pistol was also found in the backpack carried by the zombies.

In addition, Qin Fei bought a thunder barrel from a female doctor.

In addition to the fact that the mine canister can easily make ammunition from gunpowder and paper. If the other two guns wanted to make their own ammunition, it would be impossible in a short time.

Therefore, Qin Fei did not rush to mine the lead ore in this place.

It was not a few days before the next wave of corpses, and he had to hurry up and set up defenses as soon as possible.

After remembering the location of the lead mine, Qin Fei returned to his shelter.

There are still two days left until the fourth Blood Moon.

Qin Fei's shelter was more than three meters high, and when he climbed up and down from the high platform, he used a wooden ladder.

But wooden ladders are easily destroyed by zombies.

In case after the corpse tide arrived, Qin Fei would be embarrassed if he couldn't go up because the wooden ladder was destroyed.

In order to prevent this from happening, Qin Fei found a metal ladder from the town and nailed it directly to the high platform with nails.

After nailing it, Qin Fei added a skylight door with an iron bolt to the top of the ladder. This skylight door can be opened with a flick of your hand.

But zombies don't have intelligence, so naturally they won't open the door.

In addition to installing this metal ladder, these days, Qin Fei has basically been polishing the steel plate all day long.

By the morning of the 28th day, Qin Fei had sharpened a total of four steel plates into steel blades.

To make a blade trap, you need a total of two blades.

So, these four blades can make two blade traps.

After Qin Fei used nuts, wires and other tools to assemble the blade trap, he installed it under the shelter. Located on either side of a metal staircase.

When the zombie tide comes, as long as the blade trap is electrified, the two blades will spin extremely fast. The blades made of steel plates can easily cut off the legs of zombies.

After Qin Fei also arranged the blade trap, the fortifications of the entire shelter were basically completed.

As the sky got dark, Qin Fei carefully inspected the fortifications in the entire base. After making sure that there was no problem with his arrangement, he was relieved.

First of all, the outermost part of the shelter was the deep pit dug by Qin Fei. In the deep pit, there are countless wooden horses.

Further in, there is an electrified power grid.

Inside the power grid is a blade trap, because of the rush of time, Qin Fei only made two. So in other places in the power grid, all the horses are made of wood.

As the sky grew darker, several thunderclaps began to sound in the sky.

When the blood moon is in the sky, the tide of corpses is coming.

The darker the color of the Blood Moon, and the closer to the round shape it is, the stronger the zombie tide that night.

When a Blood Moon turns completely round and its color turns purple, it means that the most dangerous wave of corpses is coming.

The moon in the sky is not only becoming more and more red at this moment, but its shape has gradually changed from the shape of the crescent moon of the first corpse tide to a semicircle.

Qin Fei put the firewood that had been prepared into the generator set and lit it.

After a few moments, the fire grew larger, and the roar of engines rang out in the shelter. In the center of the shelter, the light bulb at the top also lit up when it was powered on.

It was ten o'clock in the morning.

With bursts of dog barking in the distance, more than a dozen zombie dogs rushed out of the night and galloped towards Qin Fei's location.

But they soon fell into the pit, pierced by the sharpened rejects.

Not long after the death of these zombie dogs, more than a dozen ordinary zombies poured towards Qin Fei's shelter.

Now these ordinary zombies posed little threat to Qin Fei.

After dealing with the zombies, several fat zombies rushed towards the shelter.

Their self-detonation soon filled a path through the deep pit around the shelter.

Qin Fei's first line of defense was broken through by the zombies.

But the zombies were quickly stopped by the power grid in the rear.

After the zombie touched the power grid, it was immediately hit by the electric current in it, and froze in place and kept twitching.

Qin Fei squatted on the top of the high platform, and used his iron crossbow to kill these zombies who were paralyzed by the electric current.

Even if a few zombies crossed the power grid and rushed to Qin Fei's bottom, they were all cut off by the blade traps on the ground.

The electric defenses in the shelter were so strong that it was almost effortless to defend against these waves of corpses.

'Gross...!! ’

Suddenly, there was a sound of vomiting in the distance.

Qin Fei looked towards the source of the sound.

Not far from him, stood three extremely fat zombies, wearing police uniforms.

This is military fat...

Qin Fei had already seen the disgusting aspects of this army fat zombie as early as when he was in Shanwei Food... He just glanced at the three zombies, as if he smelled the disgusting stench of corpses.

At the same time as the sound of vomiting sounded, three streams of acid sprayed towards Qin Fei's position.

The speed at which the acid spewed out was not fast, and after Qin Fei reacted, he easily dodged it.

The acid landed on the wooden planks of the high platform, and immediately a strong smell of corpses wafted out of the wooden planks.

Not only that, but the surface of the wooden planks corroded by this acid has appeared to be obviously charred black, and a puff of smoke has come out.

The acid is not less corrosive.

The last time Qin Fei was in Shanwei Food Factory, he was just splashed a little by the acid on his neck, and he was burned out of a wound.

On this high platform, there is no wall to block the acid sprayed by the military fertilizer below.

Moreover, these military fertilizers are standing at a relatively distant position. Because it was too far away, the iron crossbow in Qin Fei's hand couldn't cause much damage at all.

In desperation, Qin Fei hid behind the earthen stove on the high platform. The three military fertilizers below spewed out several strands of acid again, but they were all blocked by the earthen stove.

Acid can corrode wood and even human skin.

However, it does not do much for furnaces made of clay and stone.

Being stared at by these three military fats, Qin Fei didn't dare to show his head at all now.

This acid is not very pleasant to be splashed at all. Not to mention its corrosiveness to the skin, even if it is on the iron armor, the smell that can't be washed off can disgust you for days.

In order to avoid the attack of the military fat, Qin Fei had no way to use the iron crossbow to attack the zombies below.

The number of zombies attacking the shelter gradually began to increase again.

After all, there are only two blade traps under the high platform, and many places are defended by wooden repellents. As the number of zombies increased, these rejections were quickly destroyed by the zombies.

Without the restraint of the horses, the zombies began to frantically attack the concrete pillars that supported the high platform.