Doomsday Bunker Upgrade

　　"Ordinary refuge entrance"

　　 "Upgrade plan 1: Increase the thickness of the protective door, enhance the defense of the refuge entrance, add a biochemical radiation cleaning room, and upgrade the required survival point of 1500"

　　 "Upgrading plan two: add screen doors, add partition doors, add maintenance rooms, upgrade the air intake of the shelter ventilation system, and upgrade the required survival point 1350"

　　 Looking at the two upgrade plans, Chen Xin, who had already obtained enough supplies from the SWAT team, did not consider which plan was more suitable, so he chose to upgrade all of them.

For Chen Xin, who can now earn 15 survival points every day, with sufficient materials to reduce the consumption of survival points to 10%, the consumption of the upgrade method of using two options is already at his level. Within the scope.

　　 It's just that Chen Xin himself didn't expect that an oxygen generator made without consuming a few survival points could actually provide him with two survival points every day, which was beyond Chen Xin's expectations.

　　 But this is not difficult to understand. After all, his upgraded algae oxygen generator not only produces oxygen, but also uses the produced biomass to ferment to produce biogas for fuel cell power generation.

It is equivalent to saying that this equipment is equivalent to the functions of the three equipment of oxygen generator, biomass incubator and fuel cell. It has greatly improved Chen Xin's current living conditions, so it can obtain more survival points. It is also understandable.

　　 After choosing all upgrades, the door of the refuge was upgraded to what he drew on the design drawings according to Chen Xin's ideas under the power of the system.

　　Sturdy and heavy protective doors, a decontamination room that can be used for radiation and biochemical decontamination, a preparation room that can park cars, tidy up equipment, and a defensive corridor with heavy crossbows...

　　 Today's refuge has what a real doomsday refuge should be, with a solid and reliable defense.

　　 drove up the car that had been parked below and parked it in the maintenance room. Chen Xin also brought up the equipment he might use when going out.

　　The heavy protective clothing was hung in the closet of the maintenance room, and all the equipment and the materials needed to go out were also neatly arranged. Chen Xin looked at everything neat and tidy in front of him, and he felt a sense of satisfaction and pride in his heart.

　　 It's like the sense of accomplishment that you get when you play Minecraft and finally build a hut that you feel safe and secure.

　　 And different from the game, this is the real world, this is a real refuge, this is a real refuge that can protect Chen Xin's safety.

　　 Through the renovation and upgrading of the entrance of the refuge, Chen Xin also moved the vents and shortwave antennas that originally led to the mountainside above the entrance and placed them in a small bunker made of thick reinforced concrete.

　　 This bunker is not big, just a small space, located above the sanitation room at the entrance of the refuge, somewhat similar to a machine gun bunker in a war game.

　　 This is not a machine gun bunker, although in a sense, as long as Chen Xin mounts a machine gun here, it can indeed be used as a machine gun bunker.

　　 However, the actual function of this small bunker is to protect the shortwave antenna and vents that have been moved here. It is not true that Chen Xin wants to build a machine gun bunker here.

　　 Although it is likely to become a defensive facility in future upgrades, it is now only a shelter for short-wave antennas, and at most it serves as a ventilation function.

　　 The outside of the bunker is covered by the soil of the mountain itself, leaving only a gap about the width of a palm. It is impossible to enter the bunker from the outside, and you can only enter it through the passage reserved inside the refuge.

Compared with the short-wave antenna that was placed directly in the open air covered by a camouflage cloth, the short-wave antenna under the protection of such a small bunker is undoubtedly much safer. Even if it is discovered, it is difficult to destroy the shortwave antenna Antenna in a solid cover.

　　 As for the impact of the cover on the antenna signal, it is not without it, but it is not serious. At least Chen Xin tried it. He can still receive external signals smoothly and communicate with others.

　　 The original vent has also undergone new changes after it has been transferred to the inside of the bunker. Not only are the protective covers and grille filters added, but the vent pipe also has an overpressure automatic exhaust valve after entering the shelter.

This is a ventilation device used in civil air defense projects. The principle is to use the air pressure difference between the inside and outside of the refuge to form a seal to block the intrusion of external toxic and harmful air, and to discharge the air inside the refuge to ensure ventilation circulation .

　　 Although it sounds a bit complicated, the structure of this thing is very simple. With it, there is no need to worry about external toxic and harmful substances entering the shelter through the ventilation pipe.

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　　 At the entrance of an original shopping mall in the urban area, Qin Lan and a few special police officers are holding guns here.

This is the original large-scale shopping mall in this city, with an underground supermarket and parking lot. Before the disaster, it was planned as a small refuge, where there were about 5,000 people living in the surrounding community ~www.ltnovel.com~ The plan for this kind of small refuge was originally intended to allow some people to escape the doomsday disaster, and to connect to other refuges by passages after the disaster, as an underground residential area.

　　 However, due to the deterioration of the environment and the temporary inability to supply oxygen production equipment to small shelters, the city government can only transfer people to other medium-sized shelters and temporarily seal up this small shelter.

　　 intends to wait until the passageway connecting the medium-sized refuge here is opened up and the oxygen production equipment has surplus, and then restarted.

　　Qin Lan and the others are here to help these people with the transfer. In addition to them, there are also city staff responsible for the transfer.

　　 The second batch of oxygen generators was shipped in not long ago, but this batch is much smaller than the previous batch, with only four small biological oxygen generators.

Two of them were naturally transported to Binhu Community and Polytechnic Institute, two medium-sized refuges that had not been allocated oxygen production equipment before, while the remaining two were given to the refuge where the armed police force is located, and the other One was distributed to the factory.

　　 It is precisely because of insufficient oxygen production equipment that the city government decided to temporarily abandon all small refuges, and medium-sized refuges for all the population.

Although the population in the small shelters is not large, there are only a few thousand people, but the transfer and resettlement of thousands of people is not an easy job. The staff sent by the city government are already a little overwhelmed, and they need them to deal with various problems. deal with.

　　 Qin Lan stood at the shooting position on the roof of the armored car with her sniper rifle, constantly patrolling the crowd, searching for possible dangers.

　　 Under these circumstances, everything can happen. Qin Lan and the others must put an end to any possible criminal behaviors and prevent them from evolving into mass incidents.