Optimize shelter

"Let's first think about how to transform the ventilation system of the base. This is a big problem for underground shelters." Sitting on the slightly uncomfortable wooden chair, Liam began to recall the knowledge of the civilized era.

And the shelter design in major apocalyptic movies...

Underground shelters needed a large-scale air filtration and regulation system, but any ventilation pipes opened outside would become a safety hazard.

Therefore, in Liam's conception, it was best to use an internal circulation system, but the premise was that there was water and electricity, so that oxygen could be prepared by electrolysis, which made the internal air circulation of the entire facility possible.

Of course, it could not be completely sealed off from the outside world. This kind of completely sealed environment had extremely poor stability, and ventilation holes leading to the outside world were still necessary.

For concealment, the ventilation holes should not be too large, and there should be a sealable switch that could be closed at any time.

If it was not for the terrain restrictions, it would be the best solution to set the ventilation holes under the rock that would only be exposed at the low water level of the river bed, or on an unmanned island.

These slender pipes could draw purified and filtered fresh air into the shelter, and they could also be closed in time to use internal circulation.

But with the current conditions and equipment in the shelter, this idea could only be a concept.

After checking the items currently on sale in the trading channel, Liam decided to use the most mechanical design.

Using the periscope structure of a submarine, a window with dual functions of ventilation and lighting was opened in the center of the shelter. 

The specific design was to first dig a hole directly above the shelter and install glass with good light transmittance.

And holes that could be ventilated were punched in the glass to ensure that air could circulate through the pipes.

Going down along the dug hole, a "Z" shaped turning hole could be made in the middle of the hole.

Two plane mirrors were installed in the "Z" shaped hole, which were parallel to each other and at an angle of 45 degrees to the incident light. Through two reflections, the incident light was transmitted into the shelter to solve the lighting problem during the day.

After the first layer of ventilation glass, a mechanically explosion-proof glass could be designed to ensure that the explosion-proof glass could be closed during a disaster to prevent liquid or poisonous air from flowing in.

Such a simple design could be thought of even by a high school student, but it would be troublesome to implement it.

Without matching tools, it was a big project to wear through to a shelter five meters deep underground while ensuring accuracy.

"I have a system!"

Based on his current understanding of the system, Liam had completely understood how the system worked.

When there were no materials, the system wanted to use survival points to create materials out of thin air, which consumed a lot.

But when there were materials, the function of the system was more like a construction team. It only needed to spend a small amount of survival points to achieve the upgrade goal.

After thinking about it and confirming the feasibility, Liam opened the trading channel.

Currently, the resources he could use were as follows:

Ordinary mineral water (1000ml), M-energy water (600ml), big leba bread 10 catties.

As for the remaining pet eggs and energy bicycle drawings, he didn't intend to trade them.

Trading channel.

[Seller: Liam]

[Trading items: 50ml M-energy water]

[Required items: explosion-proof glass]

[Remarks: Water that can strengthen the body, don't miss it when you pass by, only accept two units of glass, those with good quality can chat privately] 

[Seller: Liam]

[Trading items: 15ml mineral water (upper limit 975ml)]

[Required items: 1 iron block (number of times that can be exchanged per person 1/1)]

[Remarks: Each person can only complete one transaction]

After the two items were successfully put on the shelves, Liam spent another 25ml of water to buy two units of mirrors with good reflective performance, using up all the ordinary mineral water.

Liam exchanged 15ml of water for 1 iron block. Although it was an extremely black-hearted businessman's behavior, it was no less than a savior's behavior for some players struggling on the line of life and death.

In addition, the reason why everyone was limited to only one transaction was because Liam had his own plan.

Water, as liquid gold now, he wanted it to be consumed, not to be bought and hoarded by some people with ulterior motives.

World chat channel.

"Those who are short of water and have iron blocks, go to the trading channel to have a look. The water god is selling water again! Each person can only trade once, hurry up!"

" Water is so generous!"

"Haha, it's too late. Fortunately, I paid attention to the personal channel of the water in advance, so I was able to grab a sip of water. Don't you see that the water now has more than 400,000 fans? Can you passers-by grab it?"

"Where did Liam get the water? I spent 700ml to buy the illustrated book yesterday, and today it's another 1000ml to collect iron blocks. Do you think it's too much?"

"Look, the M-energy water that the water hung up can actually strengthen the body and cure diseases. As long as it is explosion-proof glass, whoever has it, go and exchange it!"

"Alas, comparing people with people will make you mad. I haven't dug a drop of water after digging all morning. I'm dying of thirst."

A large group of people discussed this matter.

In one day, the name Liam had been imprinted in the hearts of many people.

Others wanted to break 1ml of water in half to drink, only he used 700ml to exchange for a useless garbage illustrated book in the early stage.

On the other hand, after eating a pear and the last roujiamo from last night, Liam picked up the book.

[Reminder]: Whether to use the monster illustration book, once used, it cannot be recycled and traded.

"Yes."

As Liam's words fell, after the four functions on the game panel, a function called "Illustration Book" appeared again.

Liam clicked on it.

A dense list appeared.

[Dead Leaf Snake]

[Green-headed Turtle]

[Mutant Goshawk]

Select Dead Leaf Snake.

View details.

[Dead Leaf Snake]: The back of the snake is dark brown with vermilion horizontal spots, the color of the abdomen is olive gray, with small white dots scattered among them, the head and neck are light yellowish white, and there are dark brown spots, and the active attack is weak. 

[Weakness]: Extremely afraid of fire and blunt weapon blows

[Danger Factor]: 80

In addition to the information description, there was also a 3D image of the dead leaf snake, which could be adjusted to view from different angles.

After observing several creature illustrations, Liam exclaimed that he had earned blood.

Although this illustrated book seemed useless now, the weaknesses marked on it were extremely useful. Hundreds of large and small creatures could save a lot of effort.

And this illustrated book also had an extremely buggy function.

"Scan!"

As Liam's words fell, a radar-like graphic appeared on the game panel, and a red exclamation mark appeared below.

[A mutant camouflage chameleon was detected 265 meters away from the player. The danger factor is 65. Please be careful]

[Today's times 2/3]

"There really is one?"

Following the place scanned by the radar, Liam climbed out of the shelter door and saw that he broke out in a cold sweat.

The location of the mutant camouflage chameleon happened to be where he was cutting down trees yesterday. Even if he actively observed now, it was difficult to see where the chameleon was lying.

Clutching the wooden spear in his hand, should he kill it now?

Of course not.

"This is too dangerous. Let's not talk about the sharpness of the wooden spear. With my half-assed level, I'm afraid I'm going to deliver food."

Opening the illustrated book, finding the illustrated book of the mutant camouflage chameleon, Liam read it patiently.

[Mutant Camouflage Chameleon]: The mutated skin greatly enhances the chameleon's camouflage, and the highly poisonous tongue allows it to have enough time to kill its prey after a sneak attack. 

[Weakness]: The mutation enhances the camouflage ability, but makes it slow in reaction and fragile.

[Danger Factor]: 65

It wasn't that there was no solution, Liam thought.

Under such a scorching sun, the chameleon always had to eat and drink, right?

Would it be possible to wait for it to be at its most exhausted before attacking, and then take advantage of it?

"First find a way to upgrade the weapon, and then take advantage of the hottest sun to go out and deal with this insidious beast." After making up his mind, Liam, who felt a surge of crisis in his heart, didn't plan to go out to get materials anymore. He returned directly to the shelter, closed the wooden door, and lit the torch.

Sitting on the wooden chair, he took out the wooden spear and put it on the table, and Liam concentrated his attention on it. 

[Wooden Spear]: A brand new wooden spear, the wooden spearhead has a worrying lethality, it is not recommended to be your main weapon for survival.

Upgrade direction 1: Upgrade the overall material, improve the sharpness of the spear head, need survival points (5) 

Upgrade direction 2: Upgrade the overall material, add an electric assist device, greatly increase the shooting speed, need survival points (40)