This also means that if the small 50-square-meter house he brought from the original real world is completely turned into an alloy fortress that can't be blown up by a bomb, it will only need ......

15,000 plus 63,000 plus 35,000 plus 35,000 plus 37,000 equals 150,000 gold coins.

By the way, the security door was blown up, and it only costs 5000 gold to replace it with a bomb-proof alloy security door.

Coupled with the ordinary security door in the front hall and the basement cover for fingerprint recognition, as well as the maintenance costs, a total of 159,000 gold coins, 96% off is 153,000 gold coins.

With only 153,000 gold coins, you can transform the original 50-square-meter small house into a metal fortress made of 4 cm thick futuristic technology alloy!

Bullets can't be shot, bombs can't be blown up!

When the windows are fully closed, there will be a problem of ventilation.

After querying in the terminal, there are two ways to solve the problem.

One is to install ventilation equipment on the alloy wall, and it only costs 500 gold coins to install an ordinary ventilation equipment.

But there is a problem with this ordinary ventilation equipment.

That is, if someone puts poisonous smoke, pungent snuff, etc. in the vent, it will cause the people in the room to be attacked by the poisonous smoke and pungent smoke, Lu Chao saw with his own eyes a group of knights and big knights hiding in the impregnable castle, but was forced out by Xu Junshan's pungent smoke, and then was bitten to death by wolves.

One solution is to add a filter to the ventilation equipment.

Filter all kinds of poisonous gases and fumes, and only let oxygen and nitrogen enter the room.

It costs 3,000 gold coins to install a filter. However, the filter element will be scrapped after absorbing too much toxic gas and smoke, and when the above is displayed in red, it must be replaced with a new filter, otherwise it will lose the effect of filtration.

The biggest problem of this ordinary ventilation equipment cannot be solved even by installing a filter. That is, after someone found the ventilation hole, the ventilation hole was blocked from the outside, and the people in the room were about to be suffocated to death.

It's also easy to solve this problem once and for all.

It is to spend a lot of money to install a small air self-circulation system that can be applied to spacecraft.

The smallest air self-circulation system only costs 100,000 gold coins, and the volume is only the size of a rice cooker, which does not take up space. When the electricity is applied, it automatically absorbs carbon dioxide from the air and converts carbon dioxide into oxygen. The concentration of oxygen in the cabin air can be adjusted automatically.

In this way, even if someone blocks the ventilation hole, as long as there is electricity in the room, you can use this air self-circulation system to permanently maintain the concentration of oxygen in the air without worrying about suffocation.

The house is within two kilometers of the supermarket, so there is no need to worry about the power supply.

If there is no electricity, you can also spend 50,000 gold coins to equip the small air self-circulation system with a special high-tech battery, which is only the size of a palm when fully charged, enough to provide a month's power supply for the air self-circulation system.

This also means that only 150,000 gold coins are needed to completely solve the ventilation problem of the metal fortress.

If he encounters more than 100 soldiers from the United States this time, Lu Chao can hide in the metal fortress and not come out, and the other party will not be able to force him out for the time being before he gets the metal cutting device.

Anti-zombie is also useful.

Once the fortress has a tendency to be breached, Lu Chao can also escape from the basement and the underground passage he dug.

The cost is a total of 290,000 gold coins!

Now Lu Chao still has 500,000 gold coins in his hands and 10 forging pills. After the 10 forged pills were turned into raw skins, they could soon bring him a net profit of 856,000 gold coins.

So, the 290,000 is worth spending.

In the morning, when Lu Chao went to the castle to pick up the corpse and look for the mission items, for the safety of Yaya, he could only lock her in the basement.

By the time he finished collecting and carried Yaya out of the basement, Yaya was already crying.

Maybe because she had never been separated from her father, she was too young to understand why her father suddenly didn't want her. Locked her in such a small house, she seemed to be very injured, and she was still lying on Lu Chao's shoulder, hugging his neck tightly and motionless.

If there is anything to deal with in the future, if you have to leave her aside, she should feel much better if she is locked up in the home of the metal fortress and plays with her toys by herself.

As long as it is not too far from home, with camera surveillance, Lu Chao will be more at ease and not worry that something will happen to her.

Gritting his teeth, Lu Chao clicked on the terminal to confirm.

More than 290,000 gold coins were spent, and the small house of 50 square meters began to be renovated into a metal fortress!

The instruction manual says instant installation, that is, after placing an order and paying for it, it can be installed immediately.

Will the supermarket send an installer to his home?

No, you don't.

After Lu Chao confirmed the order, several lines of prompts popped up on the screen of the terminal.

"Order has been submitted, processing......

The screen of the terminal popped up the real-time scene of the small house in Lu Chao's house.

"Construction in progress......"

Lu Chao's house was shrouded in a cloud of black fog.

"Construction complete."

The black fog cleared, and in front of the small 50-square-meter house there was an additional hall with an area of 100 square meters.

The exterior of the small house has not changed, but the inner walls are equipped with 4 cm thick future technology alloy plates.

Anti-theft windows, anti-theft nets, and anti-theft doors have all been modified.

"That's good? This technology is too advanced, right? Lu Chao sighed.

Forget it, it's not weird.

After being busy, the first medium-grade health pill was also taken for more than half an hour.

The money spent was enough for him and Yaya to both rise to LV5.

Lu Chao held Yaya and entered the physical fitness tester for a test.

Now he has a constitution of 176, an increase of 11 points from the last test.

Yaya's physique is 169, an increase of 32 points from the last test!

"Yaya's physique, if you take another medium-grade health pill, you will surpass me!"

"It's good that she's good, otherwise ......"

"It's a pity, Yaya's talent can help me cultivate, but it can't help me improve the effect of taking medicine."

In addition to improving physical fitness, health pills can also slightly improve internal strength.

Lu Chao entered the internal force tester with Yaya in his arms and tested the internal force.

Now his internal force is 96 points, an increase of 3 points from the last test.

Yaya's internal strength...... 334 points, an increase of 12 points from the last test!

If you upgrade to LV5, you can get free medium-grade health pills.

Lu Chao went to the store, and after getting the second medium-grade health pill, he took it for himself and Yaya separately.

In order to wait for the elixir to take effect, Lu Chao went around the store, and after the level reached LV5, he could now enter some places that were previously inaccessible.

Some of the things that were previously unavailable can now be bought.