Upgrade! the shelter!

Pulling to the bottom of the production page, Liam clicked with his mind, and the material list popped up.

Hunting Compound Crossbow: Wood 0/8, Iron Block 0/8, Copper Block 0/4, Nylon 0/2, Compound Nylon 0/1.

5 matching crossbow arrows: wood 0/2, iron block 0/1.

Once a blueprint for a composite crossbow is unlocked, the matching crossbow blueprint is self-contained and Liam does not need to acquire it again.

"The iron block is easy to handle."

"Now I only need nylon and compound nylon, and copper blocks."

"I don't know if anyone else has nylon, but copper blocks should be relatively easy to get."

While thinking, Liam greeted Oreo to come back, and walked back to the shelter.

When exploring the game panel, it is easy to ignore the surrounding environment, so when browsing the trading market, Liam usually does it in the shelter. 

When checking the traded items before, Liam saw a lot of weird little things.

After searching at this time, I found traces of copper blocks on the trading panel.

The current price of a copper block is 100ml of water, while nylon is nowhere to be found.

"The prices these people put on the shelves are too high."

Liam browsed around, and suddenly found that there were only two people who sold copper blocks. Before he could buy the newly listed copper blocks, they were taken away by these two people.

These players, similar to game merchants, hoard resources that are still in short supply and raise prices on the ground.

"It's better to collect it yourself, it's more cost-effective to exchange materials with M-energy water." 

After pondering for a while, Liam put up several sets of trading methods.

[Seller: Liam].

[Transaction product: 50ml M-energy water].

[Demand: 1 copper block].

[Inventory: 200ml].

[Transaction product: 100ml M-energy water].

[Demand: Nylon*2].

[Inventory: 200ml].

[Transaction product: 200ml M-energy water].

[Demand: compound nylon].

[Inventory: 200ml M-energy water].

The acid rain that will come tomorrow is not called a disaster in the eyes of most people, but a "supply".

Since the morning, the purchasing power of water has been declining.

Not only the exchange of materials, but also the exchange of the same food, is greatly reduced. 

But fortunately, the purchasing power of M-energy water is still strong.

The materials purchased can just meet the material requirements for making hunting compound crossbows.

Less than half a minute after the copper block replacement was put on the shelves, four units were traded.

"Boss, where did you dig the M-energy water? Don't worry, after we dig it out, we will share 19 points, okay?"

"God Su, I still have copper blocks, please accept mine, I haven't had water for a day."

"Sir, I have nylon, but the price is not enough, it has to go up!"

"..."

Private messages came one after another.

This is the Nth time Liam has sold M-energy water, so almost everyone guessed that he has a fixed gold mine and a steady stream of water.

Most people buy M-energy water back, not all for quenching thirst.

Basically, they are stored as strategic medical supplies. If there is any injury, maybe M-energy water can save a life.

In the world channel and regional channel, a lot of people started talking again, discussing the two kinds of nylon that Liam needed.

After the previous temptation, Liam has learned that nylon is not in short supply, but some people are reluctant to sell it because they want to raise the price.

Seeing more and more private messages, Liam set the keyword of compound nylon and ignored it.

There is no fatal threat in sight yet, and there is no need for a compound bow for the time being. Maybe if you wait for a while, some people will sell it at a low price at night.

After sorting by price, Liam received another 50 units of stone, making up for the previous loss of repairing the canal.

After slowly taking out all the construction resources and piling them up in the shelter, Liam was excited.

Living in a wooden shelter is fine in the early stage, but as time goes by, the wood will always lose its rigidity one day, which is really not safe.

Now that the conditions for upgrading the stone shelter have been met, Liam didn't procrastinate, and started to upgrade manually. 

The first thing to upgrade is the gate of the shelter, which is also the first line of safety in the wasteland.

[Shelter gate].

Effect: slightly anti-theft, slightly anti-radiation.

Upgrade direction 1: Increase the thickness of the wooden door, increase the firmness of the wood, and slightly fireproof and waterproof (10). 

Upgrade direction 2: Change the material, upgrade the wooden door to a stone door, greatly increase the durability and other attributes (5). 

Evaluation: You don't want to live in the wasteland with a wooden door, do you?

Click Upgrade Direction 2, and ten units of stone on the ground will be melted with the green light scan, turning into stone water and attaching to the wooden door.

After a short wait, the original wooden door disappeared and was replaced by a simple stone door.

Pushing open the stone door bolt, pulling the wooden handle of the stone door, and slowly pushing open the stone door, Liam was surprised again. 

The stone door is a full 20cm thick, and it is difficult to penetrate even with bullets. As long as he closes the door inside, no matter how many people are outside, they will not be able to break in.

Of course, the premise is that these people don't have explosives...

The workmanship outside the stone gate is very rough. The system also pays attention to concealment when upgrading. Although it still looks out of place in the wilderness, at least ordinary creatures will only regard it as a rough rock. 

After closing the door and returning to the base, Liam began to upgrade one by one. 

With each scan of the green light, the original wooden floor will undergo earth-shaking changes, turning into a light gray stone floor.

After upgrading the foundation, Liam started to upgrade the load-bearing and ceiling again. 

With the last piece of wood changing color, the shelter takes on a new look.

First is the internal environment.

There is no longer a damp feeling, and the dirt on the wooden boards from days of activities has also disappeared.

At this time, the ground is neat and uniform, and the whole body is composed of light gray. Because it is extremely smooth and flat, it looks like gray tiles at first glance.

Some potholes in the original place have now been filled up under the system upgrade.

The color of the stone on the wall is a slightly simple dark brown, with stone patterns appearing from time to time, making the shelter not so dull.

The ceiling is the same color as the walls, which makes it more integrated.

"Not bad."

Liam looked around from the inside out, and opened the full view of the shelter in the game panel.

[Personal Shelter].

Description: The shelter is entirely made of stone, extremely strong, has good safety, and has unique advantages in isolating moisture and keeping warm.

Space: 100 square meters (floor height 4.2m).

Completeness: 100%.

Facilities: iron stove, bed, large-scale vegetable cultivation base, M-energy well water extractor, dining table...

Introduction: Everyone has to pay for their youth, only you have to build a house for your youth.

"This is the greatness of human civilization!" 

Liam clapped his hands and sighed, the biggest advantage of a shelter entirely made of stone is nothing more than two words - safety!

The safety that everyone in the last days desperately pursues, now Liam has built it in only four days.

Walking around, touching here and there, looking at the brand new shelter, Liam couldn't help but feel happy.

"It's a pity, if only there was electricity, it would be more comfortable to live in a stone house than in reinforced concrete. Then I would install a bathroom, no, install a bathtub, watch a movie, and drink red wine..."

Looking at the ceiling, Liam sat on the steps, thinking wildly.

Coming to this world, every time the environment in the shelter gets closer to the earth, Liam's mood becomes more complicated.

It took more than 5,000 years for human beings to develop from scratch, from the Stone Age to the electrical age.

And a person's lifespan is only a few decades. In the precarious doomsday, will there really be a day when electricity will be restored?

Liam clenched his fists and threw the gloom in his heart behind him.

Now is not the time to sigh, he hasn't even walked out of the three kilometers in the nearby wilderness, let alone the future!

After counting the supplies, the current M-energy water reserves, excluding the 400ml listed in the trading market, have recovered to about 2.5L again.

Leaving 1L of water as a spare, Liam started the last wave of buying before the disaster.