Originally, the connection passage between the main part of Chen Xin's shelter and the entrance part was a slanted upward corridor of fifty meters. At that time, it was built to facilitate the convenience of cars parked inside the shelter to enter and exit the shelter, but in fact, this corridor was not as convenient as originally expected.

Because the length is only fifty meters, the height drop from the entrance to the shelter is nearly twenty meters, which makes this ramp actually very large, and it is not very convenient to drive in and out or even use a cart to drag supplies.

However, when building the shelter, Chen Xin was only considering building the shelter deeper to avoid possible meteorite impacts to the shelter. He wanted to use a soil layer more than 200 meters above the shelter as protection, so he did not worry too much about the details.

After all, the slope is relatively large and it is not very convenient to use, and it is not completely unusable.

However, since the system can be used for upgrading, Chen Xin naturally made adjustments here, changing the originally obliquely connected corridor into two horizontal channels, and using a lift in the middle to go up and down.

This is also one of the reasons why Chen Xin had to wait until the city government's materials were delivered before the shelter was upgraded. The materials for the elevator were collected by the city government's help. Chen Xin originally planned to process them himself.

The lifting area after the upgrade can be approximately the area of ​​an ordinary family car. The overall shape is a cylindrical car with a diameter of 7 meters and a height of 3.5 meters. The bottom of the car can rotate, which solves the problem of the vehicle being unable to turn around due to its narrowness when entering and exiting the passage.

I took the elevator to the upper floor. After passing through the passage, I still had the original decoration room, but there was an additional material storage warehouse on the other side of the decoration room.

This was an adjustment made by Chen Xin because of the inconvenience of material transportation before, so he placed the material warehouse on the upper floor of the entrance, and only the food pantry is retained inside the shelter.

In this way, the materials can be transported in from the door and stored directly, without any effort to transport them.

Anyway, Chen Xin is almost the same wherever the materials are placed, so he only needs to open the system interface to use the materials, and he does not need to get them in person.

After passing through the preparation room, there was still the passage with heavy crossbows.

Chen Xin did not make any major changes here. After all, it was just a channel, and the attack ability of the heavy crossbow was enough.

The only thing he adjusted was the triggering method of the heavy crossbow, which changed it from the original flip mechanism to infrared sensing automatic shooting, and set up a hidden mechanism to hide the entire heavy crossbow in the ceiling.

Anyone who passes through the corridor with the alarm turned on will be shot directly by a heavy crossbow of ninety shots in a minute. The power will not be worse than the heavy machine gun that Chen Xin was equipped at the gate.

As for the way to turn on the alarm, Chen Xin sets to turn it on from the inside and trigger the attack through face recognition.

That is, every time you come out from the inside, you can turn on the alarm switch from the inside to turn on face recognition. In this case, by passing the face recognition, you can naturally enter the shelter.

But if a stranger enters and fails to pass facial recognition, the heavy crossbow on the ceiling will be activated and the luxurious experience of dodging the heavy crossbow to shoot continuously.

As for coming out through the safety passage, Chen Xin did not make any changes to the disinfection room, but only upgraded the disinfection equipment inside.

Outside the bathroom, there is still a garage and a space that can be called a foyer or entrance.

This is an L-shaped space with a short side connecting the door and the bathroom, while the long side is to park the armored RV after Chen Xinmo's modification for extended garage.

There is nothing to say about the garage and the entrance hall. The garage only adds vehicle maintenance functions and adds some repair tools, and the entrance hall is just an open space.

What is truly worthy of attention is the gate to the shelter.

It is still the previous lifting metal armor door, but this time Chen Xin changed it from homogeneous armor to multi-layer composite armor, and the thickness increased from 30cm to 35cm. Although the thickness has only increased by 5cm, its defense performance is equivalent to a 120cm thick homogeneous metal armor.

The original double-mounted Maxim at the door was replaced with a double-mounted 12.7mm three-tube rotary machine gun, which is the same type as Chen Xin installed on an armored RV. It can still be controlled by computers and automatically locked and aimed at it.

Of course, you can still exercise your hands like Chen Xin did yesterday, experience the compassion of one breath and one 3,600 turns, and save the world with great compassion.

After inspecting the entire shelter, Chen Xin was very satisfied with the effect after the overall upgrade. In addition to the improvement of the overall layout and technological level, even the originally gray cement wall of the shelter was covered with paint, and a metal support frame was added, which looked much cleaner, tidy and spacious and brighter.

Even the lighting facilities that were originally just light bulbs were replaced with LED light tubes, which softened the light inside the shelter, and added Chen Xin's lighting control that he had been thinking about. The lighting can be adjusted with the changes of time, so that people inside the shelter can also feel the passage of time.

As for Chen Xin's observation room originally set up above the door, it has also been adjusted and upgraded this time, allowing it to evolve from a room with a simple tree antenna toward the formal bunker. Not only did it add some living facilities inside, but also a double-layer vacuum glass was added to the observation port to prevent the entry of the air conditioner.

Of course, in order to retain the defense function of the observation room, the glass in the observation port can be opened and turned back into the shooting hole.

As for the vents connected to the exterior wall, Chen Xin did not make any major changes, but only added ventilation fans and air filters to the ventilation ducts to improve ventilation efficiency.

Back inside the shelter, Qin Lan was still sitting on the sofa playing games. Chen Xin’s previous experience seemed to have no effect on her. Although the living room she was in had completely changed, the game console was upgraded from PS4 to PS5, and even the size of the TV was enlarged a lot.

"Have you finished work?" Qin Lan looked at Chen Xin picking up another controller placed aside and connecting to the game. She also pressed the pause and cut the game out and adjusted it into two-player mode.

Chen Xin sat down, nodded and said, "There is not much work left. As long as the materials are in place, it will be done very quickly. Now it has been completed."

"It's good to finish it. Come and accompany me to have a game. Last time you lost to me. Now I'll give you a chance to win me!" Qin Lan looked at Chen Xin and deliberately used a provocation method to him.

Chen Xin also smiled freely, held the handle and said, "That's what I asked you!"

"Haha, who can tell whoever wants it!" Qin Lan was obviously dissatisfied and provoked Chen Xin: "Why would you make a bet?"

"Okay, what are you betting?" Chen Xin happily responded. Although the PS5 was launched before the disaster, he had not tried this latest model: "If you lose, you will not be able to default on your debt!"

Qin Lan bit her lip, thought for a while before she made up her mind and said, "The loser is down there tonight!"

"Below? Aren't you sleeping in the lower bunk? What's down..." Chen Xin reacted, and the expression on his face suddenly became meaningful: "The bet is so big? Then I will use twelve percent of my skills!"

Qin Lan was already full of shame at this time, but she still said with great sturdyness: "Hmph! I won't lose anyway, I won't lose, it depends on how you die!"

As he said that, he threw a provocative look at Chen Xin and started the game directly.

Chen Xin smiled and became serious. It was related to the dignity of men. You can't lose such things, even if you lose, there is nothing to lose for Chen Xin.

—————————————————

We won’t be compared for the time being. It’s not worth telling the outside world how to decide between the two. Anyway, when Chen Xin woke up the next morning, Qin Lan was lying in his arms.

Carefully pulled out his arm, Chen Xin got up from the bed and put on his clothes. In order to avoid waking Qin Lan to go to the bathroom in another room to wash, he came to the upgraded new kitchen to start preparing for breakfast.

However, Qin Lan did not sleep very hard, and the absence of people beside her still made her wake up quickly.

Qin Lan, who was only wrapped in a blanket, came to the living room and looked at Chen Xin who was busy in the kitchen. She did not disturb him, but leaned against the kitchen door.

The upgraded heating system provides a warm enough environment for the shelter. Even if Qin Lan is wrapped in a blanket, she doesn't feel cold. Instead, she looks at Chen Xin busy with interest.

"I'm getting up, why don't I sleep for a while?" There was someone else at the kitchen door, so this was naturally impossible to hide from Chen Xin. He looked up at Qin Lan and continued to cut the lettuce that had just been scalded with boiling water.

"I can't sleep if you're not here." Qin Lan looked at Chen Xin and suddenly said something almost coquettish: "What should I eat in the morning?"

"You can't sleep without me?" Chen Xin smiled, looked at her dotingly and said, "I made some lettuce salad and cooked porridge, but I don't know if you are used to eating it without salad dressing? Go brush your teeth and you will be able to eat it in a while."

"Lettuce salad? It's great to have fresh vegetables now, so there's no such pickyness." Qin Lan also laughed and walked towards the room with a blanket: "Then I'll go brush my teeth."

Qin Lan went to brush her teeth, and Chen Xin's lettuce salad was cut. He only needed to season it with salt and other seasonings and then it could be served on the dining table.

When Qin Lan came out of the bathroom and sat at the dining table with only a shirt, the table had already been decorated with bowls and chopsticks and steaming porridge.

"A Xin, you are better here. You have everything. Even breakfast is so comfortable!" Qin Lan asked Chen Xin while eating breakfast: "I want to go back to the municipal bureau today. What about A Xin, you? What are you doing today?"

"I plan to make the ground source heat pump that the city government wants. I can set off early after finishing it." Chen Xin answered Qin Lan's question, and asked her: "Do you want me to send you back?"

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Chapter completed!