The sky is full of volcanic ash, floating in the darkness, and in the darkness, the volcanic ash with the smell of sulfur falls.
Ash continued to fall for five days.
For these five days, everyone has been plunged into darkness.
Once people stay in the dark for too long, their psychology will change.
In the darkness, people's emotions will slowly breed evil thoughts and despair.
At first it was just a small sprout. As the darkness extended, the sprout continued to grow and eventually grew into a towering tree.
Temperature drop.
It has dropped to only 20 degrees.
In the Da Zhangshu base, the air conditioning has already been cut off. In this temperature of 20 degrees, everyone feels quite comfortable.
neither cold nor hot.
Occasionally, there would be bursts of breeze blowing on my face. If you can ignore the volcanic ash falling from the sky and the sulfur-smelling air, the temperature is still very comfortable.
But when the wind blows, it is the most dangerous time.
Li Yu was not on duty today, so he went to the reservoir at the foot of the mountain to check. The reservoir was safe and sound. Although it was built quickly and slowly, the project was still done well.
The water diverted from the Shantang Reservoir filled the reservoir.
Thanks to the protection of the shed roof and surrounding walls, no volcanic ash floated into the reservoir.
When I shined the flashlight, the water was very clear and I could see the walls of the cement pit on both sides.
Li Yu circled around the reservoir, then squatted down, picked up a handful of lake water with his right hand, put it to the tip of his nose and smelled it. There was no smell of sulfur.
Then I took a small sip, and it was okay. It tasted similar to the water I drank from Shantang Reservoir before.
Li Yu nodded and looked at the full lake with satisfaction flashing in his eyes.
This water can be introduced into the inner city and outer city through pipelines.
It's just that the water is not used yet.
Li Yu left the foot of the mountain and looked at the fluttering volcanic ash. The volcanic ash was carried in the wind, carrying a trace of water vapor. Li Yu felt this trace of water vapor keenly.
He looked up at the sky, a trace of worry flashing in his eyes.
"Almost there!" Li Yu murmured.
From the moist strong wind just now, he felt that it was going to rain soon.
It's going to rain acid rain soon.
Soon, he left the foot of the mountain and returned to his residence in the inner city.
Just as the front foot came back, I heard a roar from outside.
Boom——
Thunder rolls.
The wind howled. With a loud noise, acid rain fell from the sky.
The raindrops were like lead bullets, hitting the ground with a loud sound and splashing water.
Acid rain raindrops carry a corrosive smell that permeates the air.
It's acid rain!
The drizzle of rain comes as soon as you say it will.
As soon as Li Yu returned indoors, the intercom on his waist started to ring.
"Mr. Li, Mr. Li, it's raining outside now. The zombies outside the wall are going crazy."
Lao Lu's voice came from the intercom.
Li Yu's heart trembled, zombies!
Put on your protective raincoat quickly.
Then he said while holding the walkie-talkie: "I already know, everyone pays attention, this is acid rain, it is corrosive to a certain extent, you must take protection when going outdoors!"
Acid rain!
Lao Lu and his uncle, who were on duty, looked at each other.
They felt the rain when they were standing outside just now, so they immediately ran back to the duty room. They didn't feel any difference in the rain this time.
So I walked out of the duty room, stretched out my hand to catch some acid rain, put it on the tip of my nose and smelled it!
really!
This rain is corrosive to a certain extent, but not very corrosive. A strong smell of sulfuric acid hits the tip of my nose.
A steady stream of acid rain falls.
Li Yu put on his raincoat and hurried to the wall.
As soon as I came to the fence, I saw that the zombies outside the fence became even more crazy. It seemed that the acid rain stimulated the ferocity of the zombies and made them extremely violent.
They are not just roaring under the wall, but they are constantly crowding towards the wall, crowding and crowding. Relying on the wall, the pile of zombies is getting higher and higher.
crazy!
Even Li Yu, who had seen such zombies and even more terrifying scenes before, was also secretly frightened at this moment.
For zombies to pile up, one thing needs to be a sufficient number, and the other thing is that the zombies need to be in a crazy state, otherwise it will be difficult to form zombies that can be stacked.
Every time it rains, the zombies' ferocity, strength, sensitivity, and running speed will be greatly improved. It seems that they can obtain some unknown energy from the rain, or the rain can stimulate them.
At this time, Lao Lu and the others saw Li Yu coming to the wall, and quickly said to Li Yu: "Mr. Li, these zombies are even crazier than before during the heavy rain. Look, in just a moment, they are all stacked up two or three meters high."
It’s so high.”
Li Yu's face was a little solemn. He looked away at the zombies under the wall and said to Lao Lu: "Have you told everyone that you are not allowed to come out without a protective raincoat?"
Lao Lu nodded and said, "I told you."
Li Yu looked towards the wind turbine on the top of the mountain. Under the acid rain, the wind was also very strong, causing the fan blades of the wind turbine to spin.
Ta-ta-ta--
There was a sound of footsteps trampling in the water.
Li Yu turned around and saw Yang Tianlong and his second uncle coming over.
After living in the apocalypse for so long, everyone has already learned from experience that every rainstorm will bring a wave of zombies.
Every night when it rains heavily, the tide of zombies becomes more terrifying.
It has been dark and dark for several consecutive days now, and if it rains again now, a zombie wave is bound to happen, so they were not notified to come over. They all put down what they were doing and came here to check the situation.
"Xiao Hang." Li Yu spotted Li Hang's figure in the crowd.
When Li Hang heard his elder brother calling him, he looked away from the zombies and stood up from the crowd.
"Brother, I'm here, what can I do?"
Li Yu looked at the middle part of the wall. He Bing originally provided the suggestion, and through the efforts of everyone, a wall movable gate was realized.
Now it is in a contracted state, attached to the wall, and the rain hits it, making a clanging sound.
"Go and ask He Bing to come over. Let's go together to open the mobile gate below the gate and check if it can operate normally."
This mobile gate knife has been installed for a while, but I have never had a chance to use it.
It was a hot weather before and there were basically not many zombies coming outside, so naturally it was rarely used.
Moreover, the zombies that appeared before were not large enough to be stacked, so they have never been used.
Now, there may be a chance to use it.
Li Hang looked at the zombies under the wall and said excitedly: "Okay, I'll call him right away."
Li Hang and He Bing put a lot of effort into developing the mobile knife.
Including stability, power supply, and how to route the lines. In order to be able to install this mobile gate blade, they also widened the fence by half a meter to protect the lines.
After spending so much effort, now I can finally use it, so naturally I want to see the effect.
Looking at Li Hang's back as he walked down, Li Yu was thoughtful.
There is acid rain now, and the personnel on duty must be rearranged.
The protection in the base needs to be strengthened again, and the number of personnel on the fence needs to be doubled.
Moreover, this acid rain lasted for a long time.
It will cause great pollution to water sources. Even groundwater, although filtered by thick soil, will still be polluted by acid rain because it has been falling for too long.
Can you drink water contaminated by acid rain?
If you look at it from the perspective of pre-apocalyptic experts, you cannot drink it.
But if it is a time of crisis, they have to drink.
Mountains, swamps, rivers and lakes will all be polluted by acid rain, as will groundwater.
If you don't drink water, you will die of thirst.
The water in some places is not too seriously polluted by acid rain, and the impact is not too serious.
But in some areas, drinking water seriously polluted by acid rain will have serious consequences.
Moreover, long-term living in acid rain and drinking acidic water will cause a series of diseases such as respiratory organs, kidney disease and cancer.
The closer the place is to the volcanic eruption, the lower the pH value of acid rain, the stronger the acidity, and the greater the harm.
In acid rain, even if you don't drink acid rain, if you are in acid rain for a long time without protection.
First of all, acid rain can cause damage to human skin. Acidic substances can affect the respiratory function of the lungs, causing acute and chronic respiratory damage, and can also cause damage to human eyes.
Acid rain is a disaster, a disaster for mankind.
But under this acid rain, it is a feast for the zombies.
Continuous darkness, majestic acid rain, this is the unique hunting moment for zombies.
Tap tap tap——
He Bing and Li Hang ran up the wall. Li Yu saw that He Bing had not put on a protective raincoat and couldn't help but cursed: "Didn't there be a notice just now? You must wear a protective raincoat when you go out of the room. Why didn't you bring it?"
."
He Bing was a little confused by the harsh criticism.
Just now, he was still in the First Outer City, taking advantage of the time when there was light, and was concentrating on studying some gadgets, but he was pulled out by Li Hang.
"I...I came here in a hurry and forgot." He Bing lowered his head and said, and he didn't quite understand.
He felt that the corrosiveness of the acid rain was not bad. He had just been exposed to the rain and didn't feel any discomfort at all.
"First go to the duty room and get a set of protective raincoats. You put it on first." Li Yu was speechless, so he took him into the duty room and put on protective gear.
Before his rebirth, he underestimated the dangers of acid rain. In the end, being exposed to acid rain for a long time caused ulcers on the skin on his face and hands, which later became itchy, red and swollen, and finally left him disfigured!
In the apocalypse, whether a face is good-looking or not is not very important, but it was a huge blow to Li Yu, which also made him become more extreme later.
After the acid rain continued for several days, he became extremely thirsty in that basement and drank a lot of groundwater contaminated by acid rain. Finally, his throat burned, his voice became like a rag, and his intestines and stomach were also affected.
Later, I suffered from stomachache from time to time, which was caused by the acid rain.
Although he survived, being exposed to acid rain and drinking water contaminated by acid rain also left many sequelae on his body.
After he is reborn, he will never let such a thing happen again.
The water storage reservoir built at the foot of the mountain is to maintain a clean water source in the base during this acid rain.
Although it is possible to distill pure water with the equipment currently available in the base, it consumes too much energy and the output is too little.
The 6,000 tons of water stored in advance are prepared for this!
Li Yu patiently talked to He Bing about the dangers of acid rain while he was wearing a protective raincoat.
He Bing naturally knew some of the dangers of acid rain, but he didn't expect it to be so serious.
Hearing what Li Yu said, the depressed mood that Li Yu had just scolded instantly turned into a feeling of gratitude to Li Yu.
Saying these things and scolding him are all for his own good.
Li Yu said this to He Bing in front of everyone, just to sound a wake-up call for everyone. Faced with acid rain, there is no need to be careless.
Then he said to his second uncle:
"People in the base must pay attention to this matter. Don't think that it's just getting wet and it doesn't seem to feel anything. But you must know that if this happens often, the final consequences will be very serious. Everyone must be alert.
"
The second uncle also heard what Li Yu said just now. At this time, he received Li Yu's instructions and said: "Well, we must pay attention to it. I will remind them right now."
At this time, He Bing also put on his protective raincoat, looked at Li Yu and said, "Mr. Li, I've already put it on."
"Well, you and Xiaohang go and open the movable gate at the gate, and let's take a look."
This chapter is not over yet, please click on the next page to continue reading! "Okay." He Bing went to the wall of the duty room and opened an iron box embedded in it.
There is a row of red buttons inside, and there are speed-adjustable push rods above and below the buttons.
I saw He Bing pressing the red button in the center.
Clang, Clang, Clang——
Outside the duty room, there was a heartbreaking sound.
Li Yu and others walked out of the duty room.
I saw several long and sharp knives bouncing up on the 8 to 10-meter wall from the ground up.
Then, move back and forth left and right.
It's not very fast.
"Raise the speed up one gear." Li Yu said to He Bing in the duty room.
He Bing heard Li Yu's order and pushed the lever under the red button to the [2] position.
Clang, Clang, Clang——
The knife that was moving very slowly just now accelerated instantly, increasing its movement speed by at least 30% compared to just now.
Seeing this speed, Li Yu said to He Bing in the duty room.
"Faster!"
The moving blade speeded up again. Under the acid rain, the sharp blade cut through the rain curtain at an extremely fast speed.
"Pull as fast as possible." Li Yu shouted.
Swish——
The moving blade was instantly raised to the fastest speed. The blade moved at an extremely fast speed, and the blades were connected together. Looking down, it seemed that there was no gap at all between the blades.
Under the illumination of the searchlight, the fast-moving knife was like lightning in the dark night, its sharp blade flashing with terrifying murderous intent.
The wall is more than 20 meters high, and acid rain has just fallen. Although these zombies are rioting, they are only three meters high, and the knife is still more than eight meters high, so there is no such thing as the knife cutting zombies for the time being.
A scene appears.
However, as time goes by, if these zombies are left alone, the stack height of these zombies will definitely become higher and higher.
After a brief inspection of the mobile knife, Li Yu felt that it was OK, so he asked He Bing to temporarily close the knife.
Just wait, you will need it sooner or later.
He Bing walked out of the duty room and said to Li Yu: "Mr. Li, the faster the moving blade, the more power it consumes. I suggest that it is better to use the third gear, or the second gear is better.
."
"Well, let's wait until then. Let's have a meeting now to discuss the next duty plan. You go and call He Chao, Lao Luo, and Lao Qin over."
"Okay." He Bing immediately went down from the wall.
In this situation, it is too difficult to rely solely on people from the inner city to guard the wall.
Lao Luo, Lao Qin and others have been joining Da Zhangshu Base for some time, especially He Chao and others, it has been a long time.
Loyalty has been tested.
There are five duty rooms on the wall. It is impossible for them to stand under the acid rain and watch at any time.
So except in times of crisis, they can stay in the duty room.
In the base, except for the gate and the walled duty room at the back door, which must be guarded by the inner city, Lao Qin and others can also come to help in the other three directions.