In the bedroom, Chen Xin was leaning against the bed and using CAD drawing software on his laptop to design the door of the shelter.

When the system upgrades items or shelter, you can modify them according to Chen Xin's ideas, so Chen Xin decided to add some of his own ideas to the door of the shelter.

As the first portal to resist external invasions, and it is also the most solid defense, the gate of the refuge is not just a gate in Chen Xin's vision.

Before the disaster came, when everyone in the Survival Group discussed how to build a doomsday shelter, everyone had put forward many plans for this issue.

The original plan was proposed by the big guy who made water purifier equipment. He drew on the federal plan to convert a shelter with an abandoned missile silo, proposed to buy an abandoned air raid shelter, and then transformed it into a small shelter, and everyone moved in to form a small community.

In this plan, the door of the shelter is designed as a protective shield door with the same level as the civil defense project built by the state. The reinforced concrete structure weighing more than three tons is wrapped with steel plates, and it is also equipped with supporting equipment such as poison filtering and air purification.

Such a gate structure is sufficient to resist the invasion of nuclear bomb shock waves, biological and chemical weapons and poisonous gases in wartime, giving people an extremely secure feeling.

But this plan was abandoned at the beginning of its proposal.

There is nothing else, Yan State does not sell abandoned civil defense facilities, especially at this critical moment when the doomsday is approaching.

So later everyone could only follow the construction plan proposed by Chen Xin, find a mountain to dig a hole, then land the specially customized container-type houses and build a shelter.

Of course, the shelter built in this way is not as solid as the abandoned civil defense project, but considering that everyone is not facing a terrifying thing like nuclear war, this kind of shelter is enough.

After all, what everyone has to face is nothing more than extreme cold low temperatures and severe air pollution. These two are much easier to deal with than nuclear radiation.

The door of the shelter was replaced by a three-defense door that everyone could buy, rather than the protective shield door that they had expected.

Originally, Chen Xin didn't have much thought about this. The three-defense door he installed was 20 cm thick. If the two doors were locked from the inside, it would be difficult for a tank outside to remove the two doors.

But now with the system upgrade, Chen Xin feels that he can make his own door more solid and reliable and improve his defense a little bit.

In Chen Xin's idea, he would add the current two three-guard doors to three, and renovate the corridor entering the shelter.

The first door is naturally the outermost door of the shelter. After entering, it should be a cleaning and disinfection room to clean and disinfect people and vehicles entering the shelter from the outside.

Although there is no such thing as nuclear radiation in the outside world now, since he learned that the chemical factory had exploded, Chen Xin knew that the air outside was no less fatal than a nuclear bomb exploded at his doorstep.

The bathroom must be equipped with. The toxic and harmful substances that have spread into the air now may not be as fatal as nuclear radiation, but if you accidentally get infected, in this era when medical conditions are far less than before the end of the world, the degree of death may be higher than nuclear radiation.

Not to mention anything else, if you are covered in acid rain, with the current medical conditions, unless Chen Xin creates a medical cabin that can repair body tissues, it will only be worse than death.

The current acid rain is different from before the disaster. At most, before the disaster, itchy body, causing allergies or lung diseases, and you need medical treatment.

But the acid and alkali concentration of acid rain now is much higher than before the disaster. If it is poured, it will really corrode the skin.

After the disinfection room, Chen Xin was preparing to build a preparation room.

The so-called preparation room is a place used to prepare travel equipment.

Chen Xin planned to place all the protective equipment that he might use when going out here and move the garage up.

In this way, you can prepare here, and after everything is ready, you can start from the garage room without having to pass protective equipment into the shelter.

This can not only make room for the current crowded shelter interior, but also reduce the possibility that external harmful substances are brought into the shelter interior.

Between the cleaning room and the cleaning room, Chen Xin also plans to install another partition door to prevent harmful substances from entering the shelter through the air. At the same time, he can also install defensive weapons between the cleaning room and the cleaning room.

Although Chen Xin did not intend to harm others, he still had to be prepared for it.

This is no better than the official shelter, and the door outside is not as solid as the official shelter. If someone opens the door, he always has some self-protection means to kill the enemy.

The ideal way is of course to get a laser corridor in the movie "Resident Evil", and no matter how many people come, they will die.

But Chen Xin just thought about this kind of thing. In fact, it is not that he can't get it out, but that it is not cost-effective.

So Chen Xin planned to set up a heavy machine gun in the direction of the shelter gate. When an unknown person or an enemy came in, he would directly shoot the gun, which was convenient and fast.

However, there is no heavy machine gun at hand now, and Chen Xin plans to use bows and arrows to make bed crossbows instead.

In a sense, if you use a bed crossbow, it is even more powerful and has better results than a gravity machine gun.

Even if it is transformed into a crossbow, the lethality is nothing to say, and the arrows can be recycled and reused, which is efficient, energy-saving and environmentally friendly.

As I thought about this, Chen Xin’s design drawings were almost the same.

The first three-defense door is used as the main door. After entering, it is a cleaning room. The cleaning room is connected to the garage room, and a short corridor is connected in the middle. Two partition doors are installed. A continuous shooting crossbow is installed in the corridor. If someone is unknown or is simply an enemy, then shoot him a candied haws.

After entering the garage room through two partition doors, you have to pass through a three-defense door before you can officially pass and enter the corridor connecting the shelter.

At the bottom of the corridor is the last three-defense door.

With such protection, Chen Xin felt that the safety of his shelter could be greatly improved.

In addition to protection, Chen Xin also plans to adjust the short-wave antenna and vents into the shelter, so as to avoid the dangers of the enemy cutting off his communication and poisoning the shelter through the ventilation duct.

Should we adjust the structure of the corridor? Make the floor hidden door and add another defense?

Chen Xin thought about it carefully, but in the end he gave up this idea. It was not that he could not do it, but that it was not necessary.
Chapter completed!