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Sunday, September 14th.

It was less than thirty-six hours before the virus broke out.

At six o'clock in the morning, Lin Yue stood in his temporary residence on the second floor of the cold storage, making final construction deductions against the hand-painted park floor plan on the wall.Lao Zheng finished drawing this picture last night. He used a whiteboard pen bought from a convenience store to draw it directly on the white wall of the cold storage. The strokes were rough but the proportions were precise.Each building, each section of wall, and each entrance and exit are marked with different colors - red is the weak point that needs to be reinforced first, yellow is the secondary fortification, and blue is the reserved expansion area.

Lin Yue drew a circle on the east wall where the red marks were the densest.

"Start from here." He turned around and said to the six people standing behind him.

Zhao Ming, Da Liu, Lao Zheng, Xiao He, Ah Qing, plus Lu Hanshuang who officially joined the team last night.Seven people were crowded into this room of less than 20 square meters. Some were drinking from enamel cups, while others were leaning against the wall and eating compressed biscuits. However, the eyes they looked at Lin Yue were the same - focused and without unnecessary nonsense.After a whole day of material procurement and base layout yesterday, this improvised team has begun to form a tacit understanding.

"There are three weak points in the east wall. The first point is the gap at the back door, which is one meter wide and needs to be sealed with cement. The second point is the crack in the wall in the southeast corner. Lao Zheng knocked on it yesterday and the sound was hollow. There may be structural damage inside and steel plates need to be reinforced from the outside. The third point is the top of the entire fence.There are no anti-climbing facilities.This morning I took Da Liu to install all the barbed wire that I bought yesterday, and stretched it around the top of the wall to form a 70-degree angle with the wall.Ordinary zombies will not be able to climb up, and the lickers will be caught by the wire when they climb the wall, giving us five to ten seconds to react."

Lu Hanshuang leaned against the corner with his arms folded and remained silent since Lin Yue started speaking.She didn't speak until he finished talking about the angles and tactical uses of the barbed wire.

"The camber angle of seventy degrees is correct. But the bottom of the barbed wire must be buried at least 20 centimeters below the top of the wall. You cannot tie it directly to the top of the wall - the weight of the zombies cannot hold it, and it will fall off if you pull it." Her voice was not high, but every timeEvery word is like deploying a combat mission, "There should be burrs on the top of the barbed wire. When cutting, don't cut it flat. Use pliers to bend it outward. The burrs can scrape off the flesh of zombies. The more burrs are hung, the less likely the net will be washed down."

Lin Yue glanced at her and nodded.This is why he needs Lu Hanshuang.To him, the installation method of the barbed wire fence was just "anti-climbing", but to her, it was a tactical engineering that was accurate to the burr angles and stress points.

"You direct the installation of the barbed wire fence." Lin Yue said, "Da Liu will help you."

Lu Hanshuang did not refuse, nor did he show any pride in being reused.She just nodded, then walked to the wall and lightly drew a circle on the wall line on the plan with her fingernails: "The total length of the circle is about one thousand meters. The barbed wire you bought yesterday is four rolls, each roll is 25 meters, adding up to 100 meters. It is only enough to cover one-tenth of the wall."

"First cover both sides of the main entrance and the east wall." Lin Yue said, "We will buy the rest when we replenish supplies this afternoon. Xiao He, please check where else you can buy galvanized wire mesh in the north of the city - besides the warehouse supermarket."

Xiao He is already typing on the computer."I found it. There are three hardware stores in the building materials market in the north of the city, and the inventory shows that there are still twelve volumes in total. But today is Sunday, so not all of them are necessarily open."

"Buy as many as you can." Lin Yue picked up the engineering shovel placed on the table. The blade of the shovel was sharpened by Zhao Ming yesterday and glowed with a cold steel color in the morning light. "Everyone, construction will start at seven o'clock in the morning. Before twelve o'clock at noon, the gap in the east wall must be sealed and the barbed wire must be installed..In the afternoon, Zhao Ming and I went to the building materials market to replenish supplies.Lao Zheng took Xiao He to continue to stock up on gasoline. There were still five empty barrels yesterday, and they were all filled today.Ah Qing stayed behind to check the list of chronic disease medicines that he had not bought yesterday and give me the final version before noon."

"What about me?"

The person who asked this question was Wang Hao.

He squeezed in from the door, wearing a greasy gray overalls and holding a dismantled diesel injector in his hand.He arrived at 5:30 this morning, earlier than everyone else, and got into the power distribution room as soon as he arrived.Lin Yue noticed that there were bloodshot eyes in his eyes - he obviously didn't sleep last night and was rushing to inspect the old diesel generator.

"How is the motor?" Lin Yue asked.

"There are no cracks inside the cylinder. The piston ring is a little rusty but not serious and can be repaired." Wang Hao lifted the fuel injector, which was stained with black carbon deposits. "Three of the fuel injectors are clogged and need to be replaced. The oil filter is completely scrapped. I took apart the other parts and found that the crankshaft and connecting rod are fine. Give me the parts and I can make it run tonight."

"Give me the accessories list."

Wang Hao took out a crumpled piece of paper from his pocket, unfolded it and handed it to Lin Yue.There are seven or eight lines of densely written words on it, and the handwriting is crooked, but each item is marked with the model number and possible alternative models - his professional habit of always providing a backup plan.

Lin Yue glanced at the list and handed it to Xiao He.“Check where to buy these accessories.”

"Diesel engine parts..." Xiao He enlarged the map of the north city on the screen and switched to the industrial products market layer. "There are three diesel engine parts stores in the auto parts city in the north of the city. But today is Sunday, most of the stores in the auto parts city are closed, and only one or two may be open. They may not have all the models he needs."

"Buy as much as you can. What you can't buy -" Lin Yue turned to Wang Hao, "You just said you can use alternative models?"

"It depends on the situation. The fuel injector is easy to handle and can be adjusted as long as the amount of fuel injection is about the same. The filter is more troublesome. If the interface is different, you need to make an adapter flange yourself. Give me a steel plate and I can cut it out with an angle grinder."

"We have steel plates. Zhao Ming, how many steel plates were in the batch of reinforcements brought back from the building materials area yesterday?"

"Four pieces, three millimeters thick." Zhao Ming replied immediately, "It was originally used to reinforce the power distribution room."

"Is it enough?"

"Enough." Wang Hao said, "Three millimeters is enough. I will use a bench drill to drill the holes - do you have a bench drill here?"

"No." Lin Yue said, "I'll buy it this afternoon."

Wang Hao nodded, put the fuel injector back into his pocket, turned around and prepared to return to the power distribution room to continue working.He stopped again when he reached the door, turned around, and said in a serious tone that he probably didn't even realize: "Brother Lin - if this diesel engine is repaired, it can provide lighting and basic electricity for the entire park. Then it won't be supported by three small generators. The power of this machine is 70 kilowatts, which is enough for you."

Lin Yue looked at him.The bloodshot eyes in the fat man's eyes were particularly obvious in the morning light, but his eyes were bright, and the light that meant he was needed and taken seriously had not dimmed since last night.

"I know." Lin Yue said, "Go and repair it. The accessories will be brought back to you in the afternoon."

Wang Hao turned around and left.

At seven o'clock sharp, construction begins.

The early morning air in the northern suburbs has the unique dryness and coolness of autumn.Lin Yue took off his coat and wore a short-sleeved T-shirt. Together with Da Liu, he moved the cement bag he bought yesterday to the gap in the back door.Cement is of high grade and sets quickly, making it suitable for emergency repairs.Lao Zheng had already picked up a pile of broken bricks from a nearby abandoned construction site and piled them next to the gap.

"First knock off the loose bricks on both sides of the gap." Lin Yue squatted down and touched the edge of the gap with his hands. "Here - there were several heavy rains last year, and half of the mortar was washed away. If the loose bricks are not removed, the new bricks will not be able to bear the strength, and the zombies will fall down when pushed."

Da Liu picked up the sledgehammer and hit the spot pointed by Lin Yue.The loose bricks shattered and the fragments splashed onto Lin Yue's trouser legs, but he did not hide.Lao Zheng squatted on the other side and used a chisel to clean out the broken mortar in the gaps.The two of them were doing each one, and the movements were not fancy, but every move was in place.In the previous life, in the apocalypse, building walls was a basic skill that every survivor must learn - everyone who couldn't build walls died.

"Brother Lin." Da Liu asked while knocking bricks, "You said the zombies pushed the wall - how strong are they?"

"Ordinary zombies are about the same as humans. A single zombie cannot knock down a brick wall. But zombies will not move alone. The smallest group of zombies has more than thirty. The ones in the back push the ones in front, and the ones in front hit the wall. The force is superimposed - a two-meter-five-meter brick wall. If it is not reinforced, a group of thirty zombies can break through it in ten minutes."

“What about fifty centimeters of concrete?”

"Ordinary zombies won't be able to knock them away for a lifetime. But if it's a giant zombie - the strength of that mutant is equivalent to a car traveling at 40 kilometers per hour - the concrete wall can't withstand continuous frontal collisions. So we need multiple lines of defense. The barbed wire is the first line, the wall is the second line, and the pit behind the wall is the third line. We can't dig the pit today. We have to wait until the end of the world to use engineer shovels and manpower to dig it. Dig outside the main entrance first."

Da Liu didn't say anything, and his strength with the hammer obviously increased.

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