Chen Xin finally persuaded Qin Lan to agree to stay and take care of his shelter, instead of following him to travel thousands of kilometers back to his hometown to pick up people.

As for Chen Xin's method of persuading Qin Lan, it was naturally for her to see the various weapons and equipment he had prepared on that tracked armored RV.

Looking at the radar, drones and heavy machine guns that Chen Xin installed in the car, Qin Lan knew that these things were enough for Chen Xin to protect himself along the way, as long as he didn't go to the army to hardtop, ordinary robbers or something, he couldn't help his armored car at all.

The only thing that made Qin Lan a little worried was that Chen Xin was only one person, and if something happened on the way, there might be no way to deal with it in time.

However, this is not a problem, Qin Lan did not continue to insist that he had to accompany Chen Xin on this trip, so after Chen Xin put out the weapons on the car, Qin Lan did not continue to entangle.

And what Chen Xin said is also reasonable, he may be gone for a month or two, and it is necessary for her to help Chen Xin take care of his home.

With Qin Lan to help with the housekeeping, and Mo Qingyan and Mo Qingxin to take care of it, Chen Xin has no worries about his home.

Now it's just a matter of upgrading the entire shelter and building the ground source heat pump that the city government wants, and then it's time to set off.

In order to prepare for the upgrade, Chen Xin deliberately took a shower at night and went to bed early, in order to give himself a good state, waiting for the overall upgrade of the shelter after getting up early tomorrow morning.

Qin Lan had already moved to his room, but tonight, neither he nor Qin Lan had said anything about the idea of doing some intimate acts, Chen Xin climbed into the upper bunk and quickly fell asleep.

And Qin Lan slept on the lower bunk, listening to the sound of even breathing after Chen Xin fell asleep on the upper bunk, and she fell asleep quickly, but the corners of her mouth were slightly upturned, with a satisfied smile on her face.

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Early the next morning, Chen Xin got up very early, even earlier than Qin Lan, who always got up early.

After washing up and making breakfast, Chen Xin called Qin Lan up.

Ding Ning had to go back to the city bureau to report the situation yesterday, so he left with Li Tou and them yesterday, leaving only Qin Lan to stay with Chen Xin because he was still on leave for his injuries.

So it was just the two of them for breakfast this morning.

After eating the porridge with crushed ham specially added by Chen Xin, Qin Lan asked Chen Xin: "Ah Xin, you said that you were going to start renovating your house today, so how are you going to start?" Is there anything I can help me with? ”

"Where to help? There's nothing to help with, I've already completed most of the renovation, and the reason why I haven't done it before is just that the materials are not enough. Chen Xin heard Qin Lan say that he wanted to help, and after thinking for a while, he declined her kindness: "Now that the city government has sent the materials, it is enough for me alone, Ah Lan, you should have a good rest today." ”

After speaking, Chen Xin finished cleaning up the table, and then went to the storage room alone.

Qin Lan heard Chen Xin say that he didn't need to help himself, and he didn't force it, but turned on his game console, preparing to take a good rest today according to what Chen Xin said.

Chen Xin, on the other hand, came to the storage room, looked at the materials filled with the storage room, and prepared to start the overall upgrade of the shelter.

The system interface was opened, and the mind was controlled to focus on the entire shelter, and the system's interface also showed the option to upgrade the entire shelter.

"Easy Shelter"

"Upgrade plan 1: upgrade the protection level of the shelter, improve the disaster prevention ability of the shelter, improve the survival comfort, the overall technology of the shelter +1, and upgrade the survival point required 12000"

"Upgrade Plan 2: Expand the living space of the shelter, increase the capacity of the shelter, improve the material support capacity of the shelter, the capacity of the shelter +5, and the survival point required for the upgrade is 15,000"

Chen Xin did not make adjustments to the upgrade plan as before, but he had his own detailed ideas for some details of the overall upgrade of the shelter.

Without too much hesitation, he directly put all kinds of materials in the storage room into it, and chose two plans to upgrade at the same time, reducing the consumption of survival points to one-tenth still requires nearly 3,000 points, which is two-thirds of the remaining survival points in Chen Xinxing's hands at present, and most of the materials stored in the storage room are directly consumed, leaving only a little bit of bits and pieces.

It can be said that Chen Xin's accumulation over the past half a year has been consumed in this upgrade.

But as the green light spread to every inch in front of him, Chen Xin closed his eyes with a smile of joy and expectation, he wanted to open his eyes and see a new shelter.

When he reopened his eyes, the green light had dissipated, and the shelter had changed.

He was still standing in the pantry, but it had become a simple pantry, with shelves for storing all kinds of food.

Chen Xin looked at the food storage room, which was as big as the original storage room, and checked the cold storage that had been upgraded with the previous food storage room and refrigerator, Chen Xin nodded with satisfaction and left the storage room.

After walking out of the storage room, Chen Xin was faced with the original public space, but now it has been upgraded to a hall.

This is one of the changes made after the overall upgrade of the shelter, Chen Xin turned the original shelter into two floors, and the public space is connected to the upper and lower levels as a hall.

On the first floor, there are rooms for storage, workshops, and infirmaries, as well as a power generation area consisting of a ground source heat pump, an algae oxygen generator, and a power distribution room, and a passage connecting the greenhouse to the plantation greenhouse.

The main body of the second floor is a semi-open living room and kitchen, because the common space connects the upper and lower floors, so one side of the living room happens to be a balcony-like structure, and the first floor can be directly seen.

There are five double rooms around the living room, each with a separate bathroom, which also has a bathing function, but Chen Xin still built a separate bathroom on the second floor, which can be regarded as fulfilling his promise to Qin Lan and making a hot spring bath.

Chen Xin didn't go up to the second floor, although he could see Qin Lan sitting in the living room playing a game as soon as he looked up now, as if she didn't feel anything.

Turning around and coming to the growing greenhouse through the passage connecting the growing greenhouse, there has been a sea change.

The original boxy planting greenhouse has become a huge cylindrical structure with a diameter of 15 meters and a height of 20 meters, and the biggest change is not the space of the planting greenhouse, but the planting area inside it.

The bottom of the planting greenhouse has become a one-meter-deep pool, in which several swimming fish are swimming happily, it seems that Chen Xin used the sink to raise them too aggrieved, and now there is finally enough space to swim.

In addition, the hydroponic planting tray and soil planting area, which originally had only one floor, have also been changed to a square hydroponic planting tray with an area of six floors and one acre, one layer on top of each other, which is irrigated by a circulation system in the planting greenhouse.

The bottom two layers of planting trays are planted with the previous upland rice, which does not seem to make much difference, but the rhizomes at the bottom are no longer rooted in the soil, but have been replaced by planting trays and nutrient troughs.

The upper four layers are a quarter of a layer of carrots, a quarter of a layer of cabbage, a quarter of a layer of lettuce, and the remaining quarter of a layer of strawberries, and the other three layers are empty.

These are all crops that Chen Xin planted before, and it is clear that the system upgrade only changed the structure of the greenhouse, and did not affect these crops.

The entire planting greenhouse has now entered the mechanical automation, and the automatic planting, maintenance and harvesting are carried out through the operation table in the operation area at the door, which is undoubtedly much more advanced than the previous Chen Xin who also needs to turn the ground and harvest by himself.

This is obviously the embodiment of the overall upgrade of the technology level +1.

After inspecting the planting greenhouse, Chen Xin came to the power generation area again, which is the energy supply core of the entire shelter, which can be regarded as the heart area, especially after the upgrade, Chen Xin connected the ventilation system of the shelter here, and the entire power generation area is even more important.

The power generation area is also a large room, with four ground source heat pumps and their generators on the floor, and against the walls are four huge green glass jars, which are algae oxygen generators.

However, now that they have been upgraded, not only have they become larger, but the algae sediments in the harvest can be automatically extracted, and even the algae in them have been changed to a certain extent, and they can produce ethanol.

Although the production is not high, only 100 liters of ethanol can be supplied to Chen Xin a month, this is very good news, at least the Vault has produced a new product.

The algae oxygen concentrator is now connected to the ventilation system, and the oxygen it produces is delivered directly through the ventilation ducts to all corners of the shelter.

As for the power distribution room, it is still a combination of the power distribution cabinet and the battery, but there are three more battery mounting positions next to it, which can install the isotope temperature difference battery used by Chen Xin on the armored RV.

Although Chen Xin himself has built isotope temperature difference batteries, which are commonly known as nuclear batteries, he did not directly change the shelter to nuclear batteries or nuclear reactors for power, but only prepared three isotope temperature difference batteries in the power distribution room as backup power sources.

"That's good! In this way, there is no need to worry about power outages and lack of oxygen. Chen Xin nodded with satisfaction, although the lack of oxygen and power outages had long been out of his mind.

After inspecting the power generation area, Chen Xin took a look at the medical room and the work area, which did not change much, the work area only became more advanced with various small lathes and equipment, and the medical room was separated from the sterile operating room and a ward, which seemed more like a small medical station than just a medical room.

These are the main parts of the shelter after the overall upgrade, but Chen Xin knows that in addition to these, the entrance area on the side of the gate has also changed drastically, at least he moved the material storage room to the top and turned it into a material warehouse.

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