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Chapter 84 Thank you for the reward of 100,000 yuan, leader of the alliance.

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

    When the system upgrades items or shelters, they can be modified according to Chen Xin¡¯s ideas, so Chen Xin decided to add some of his own ideas to the shelter door.

    As the first portal of the refuge to resist outside invasion, and also the strongest defense, the gate of the refuge is more than just a gate in Chen Xin's imagination.

    Before the disaster struck, when everyone in the survival group discussed how to build a doomsday shelter, everyone put forward many plans for this problem.

    The original plan was put forward by the big guy who made water purifier equipment. He learned from the federal plan of using abandoned missile silos to convert shelters, and proposed to buy an abandoned air raid shelter and then transform it into a small shelter. Let's work together  Live in it and form a small community.

    In this plan, the door of the shelter is designed to be a protective screen door with the same level requirements as the national civil air defense project. The reinforced concrete structure weighing more than three tons is wrapped with steel plates, plus supporting equipment such as poison filtration and air purification.  .

    According to standards, such a gate structure is sufficient to withstand the attack of nuclear bomb shock waves, biological and chemical weapons and poisonous gas in wartime, giving people an incomparable sense of security.

    It¡¯s just that this plan was abandoned when it was first proposed.

    Without him, Yanguo would not sell abandoned civil air defense facilities, especially at this critical moment when the end is approaching.

    So later, everyone could only follow the construction plan proposed by Chen Xin, find a hilltop to dig a hole, and then fill it with specially customized container houses to build a shelter.

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

    After all, what everyone has to face is nothing more than extremely cold temperatures and severe air pollution, both of which are much easier to deal with than nuclear radiation.

    The door of the shelter was replaced by a three-proof door that everyone can buy, instead of the protective screen door as previously expected.

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

    But now that the system has been upgraded, Chen Xin feels that he can still make his door stronger and more reliable, and improve its defense a little bit.

    In Chen Xin¡¯s idea, he would add the current two three-defense doors to three, and renovate the corridor leading into the shelter.

    The first door is naturally the outermost door of the shelter. After entering, there should be a disinfection room that can be cleaned and disinfected to clean and disinfect people, vehicles and equipment entering the shelter from the outside.

    Although there is no such deadly thing as nuclear radiation in the outside world, since knowing that chemical plants have exploded, Chen Xin knows that the air outside is no less deadly than a nuclear bomb exploding in front of his home.

    Disinfection rooms must be equipped. The toxic and harmful substances that have permeated the air now may not be as deadly as nuclear radiation, but if you are accidentally contaminated, in this era of medical conditions that are far inferior to those before the apocalypse, the degree of death will be  I'm afraid it's still on top of nuclear radiation.

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    The acid rain now is different from before the disaster. Before the disaster, the most common symptoms were redness and itchiness on the body, which caused allergies or lung diseases and required medical treatment.

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

    After the decontamination room, Chen Xin plans to build a preparation room.

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

    Chen Xin plans to put all the protective equipment that may be used when going out here, and also move the garage up.

    In this way, you can carry out preparations here. After getting everything ready, you can start from the preparation room without having to put the protective equipment into the shelter.

    This can not only free up space inside the currently crowded shelter, but also reduce the possibility of harmful substances from outside being brought into the shelter.

    Between the decontamination room and the maintenance room, Chen Xin also plans to install another partition door to block harmful substances from entering the shelter through the air. At the same time, defensive weapons can also be installed between the maintenance room and the decontamination room.

      Although Chen Xin does not intend to harm anyone, he still needs to take precautions.

    He doesn¡¯t have various defense facilities like the official shelter, and the door outside is not as strong as the official shelter. If someone opens the door, he must have some means of self-protection that can kill or injure the enemy.

    The most ideal way is of course to create a laser corridor like the one in the "Resident Evil" movie. No matter how many people come there, they will all die.

    ¡°But this kind of thing is just a thought. It¡¯s not that it¡¯s impossible to actually get it, but it¡¯s not cost-effective.

    So Chen Xin¡¯s plan is to get a heavy machine gun in the direction facing the shelter door. When an unidentified person or enemy comes in, he can shoot directly, which is convenient and quick.

    But now that he doesn¡¯t have a heavy machine gun on hand, Chen Xin plans to use a bow and arrow transformed into a crossbow instead.

    In a sense, using a bed crossbow is even more powerful and more effective than a heavy machine gun.

    Even if it is transformed into a repeating crossbow, the lethality is equally impressive, and the arrows can also be recycled and reused, which is efficient, energy-saving and environmentally friendly.

    After thinking about it like this, Chen Xinxin almost finished the design drawing in his hand.

    The first three-proof door serves as the main door. After entering, there is the decontamination room. The decontamination room is connected to the maintenance room. It is connected with a short corridor in the middle. Two partition doors are installed. A repeating heavy crossbow is installed in the corridor. If someone is unidentified, or simply  If he is an enemy, then shoot him with sugar-coated haws.

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

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

    With such protection, Chen Xin feels that the safety of his shelter can be improved a lot.

    In addition to protection, Chen Xin also plans to adjust the short-wave antenna and vents to the interior of the shelter, so as to avoid dangers such as enemies cutting off his own communications and poisoning the interior of the shelter through ventilation ducts.

    Should we also adjust the structure of the corridor?  Make it a hidden door on the floor to add another layer of defense?

    Chen Xin thought about it carefully, but finally gave up on the idea. It wasn¡¯t that it couldn¡¯t be done, but it was just unnecessary.  (Remember the website address: www.hlnovel.com
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