After resetting the circuit and room in the shelter, Chen Nuo did not buy the water source station and the power station as soon as possible.

"The first floor is better as a place for daily life." Chen Nuo looked at the 100-square-meter refuge and thought to himself.

"And, the current double-layer iron gate is probably not enough to withstand the second wave of attacks from the core underground beasts, and it needs to be strengthened." Thinking of this, Chen Nuo's face turned much ugly.

He had faced such a crisis, so he deeply knew the horror of the underground core beasts.

Therefore, he knew that the iron gates now were not enough to resist them!

"System, I want to upgrade the shelter and choose to build the second floor downward!" Thinking of this, he resolutely chose to upgrade the shelter again.

"Ding, it takes fifty upgrade points to upgrade again! Is it an upgrade?" The system prompt came to my mind, which changed Chen Nuo's face.

However, he didn't care too much about double the upgrade point.

After all, during the catastrophe, no matter who it is, it is easy to die in it!

So, what's the point of upgrading?

Living life is the most important thing!

At present, we must increase the thickness of the iron door and surrounding walls as soon as possible, otherwise it will definitely not be able to withstand disasters!

"Upgrade!" Thinking of this, Chen Nuo gritted his teeth and directly chose to upgrade!

"Ding, the shelter was successfully upgraded, the double-layer iron door was upgraded to a steel door with a thickness of ten centimeters, and the thickness of the surrounding walls was increased to ten centimeters!"

"Host: Chen Nuo!"

"Sanctuary: Level 2! (Advanced!)"

“Sanctuary Equipment: Steel Doors!”

"The remaining upgrade points: 140 points!"

"Ding, because the shelter is built down, there will be a free elevator! Please set the elevator location!"

As soon as the words were finished, a system prompt sound appeared in his ears, and the attribute panel in front of him also appeared.

He looked at the attribute panel, was surprised and even sent the elevator to pull out the shelter panel and began to find a location for the elevator.

Soon, he chose a place on the template to set it as an elevator.

However, because there is no electricity, the elevator cannot operate.

Chen Nuo only remembered this problem after setting it up.

Fortunately, he remembers that stairs can be set on the shelter template.

"It seems that the template is useful for going up the stairs." He couldn't help but think.

As he said that, he looked at the template.

At this time, because of the second layer, the template also changed.

Chen Nuo was just a little surprised, and then set up a stair next to the elevator.

Putting away the template, Chen Nuo nodded at the stairs not far away.

"Well, let's set up a water source station and a power station on the second floor first." As he said that, he moved out of the mall and walked downwards.

The second floor is the same as the first floor at the beginning, and it is extremely empty and requires you to set up your own rooms and other facilities.

However, this time, he did not set up rooms and other facilities, but instead clicked on the mall.

Looking at the number 140 displayed in the upper right corner, he looked at the water source station and the power station.

Water sources and power sources are indispensable during the disaster, but if you are alone, the water sources and power sources should not need to be upgraded too advanced.

Thinking of this, he spent twenty points to upgrade and purchased a water source station and a power station.

Because the area may increase after the later upgrade, the two stations are quite far apart.

"Ding, the water source station was purchased successfully! Is the system automatically setting up all waterways in the shelter?"

"Ding, the power station is purchased successfully! Is the system automatically setting up all the circuits of the shelter?"

When he set up the two supply stations, two prompt sounds appeared in his mind.

This made him frown.

If this kind of operation is done, wouldn’t the water circuit I set up before be idle?

Of course, no matter how depressed he is, he still chooses to set it automatically.

And when he made a choice, in less than ten seconds, the second floor of the entire shelter became bright in an instant!

Looking up, the circuit spreads on the wall in a very organized manner, leading to the first floor.

Not only that, the system also installed the light tube.

This made Chen Nuo feel: "There is another money left to buy light tubes."

Turning off the flashlight on the phone, Chen Nuo subconsciously glanced at the elevator beside him.

The elevator did not light up at this moment, obviously because the electricity supply was not available.

After all, the data displayed by the power station is that only 10 watts of electricity are supplied per hour.

After looking at the remaining 120 upgrade points, Chen Nuo thought it would be better to upgrade the shelter first.

After all, he is the only one, and not much water and electricity are used.

On the contrary, the shelter, with a low level, the defense of the iron gate is not high, and the defense is not high, so it will definitely not be able to withstand the second wave of attacks from the core beasts under the ground.

Of course, although the first wave of disasters has not yet arrived, Chen Nuo, who has experienced the disaster, still feels that he has to make all preparations in advance.

At least, you have to make yourself feel a little safe.

Turn off the lights on the second floor and he walked towards the first floor.

At this time, the first floor is naturally brightly lit.

"How to get the upgrade point in the system?" When he thought of upgrading the shelter, this problem naturally arose.

"Ding, the system will give the host a hundred upgrade points every day. In addition, if the host kills monsters during the disaster, you can also get corresponding upgrade points!"

The systematic answer made Chen Nuo ponder.

"Since that's the case, I want to upgrade the shelter and choose to build the third floor!" Chen Nuo thought for a while and said.

Now, he has 120 upgrade points left. At the same time, he needs to upgrade the shelter again, so naturally he cannot waste the upgrade points elsewhere.

After all, it is perfect now to take refuge in all electricity and water.

Although there are not many water sources and power sources, it is enough.

"Ding, the upgrade is completed! The steel door is upgraded to a fingerprint-recognized aluminum alloy door! The thickness is fifteen centimeters! The thickness of the surrounding wall is fifteen centimeters!"

“The third floor elevator link is completed!”

"Host: Chen Nuo."

"Sanctuary: Level 3! (Advanced!)"

"Sanctuary Equipment: Fingerprint-recognized aluminum alloy door, water source station, power station!"

“The remaining upgrade points: 20.”

There were still twenty upgrade points left. After looking at the shelter where the two hundred upgrade points needed to upgrade again, Chen Nuo couldn't help frowning and subconsciously looked at the aluminum alloy door.

He was not sure whether this sect could block those monsters, but now he could not upgrade the shelter again.

So, even if he has that heart, he does not have that strength.

"Just in case, it's better to keep these twenty points." He wanted to upgrade the hydropower station, but after thinking about it, he still planned to keep the upgrade point first.
Chapter completed!