Li Chen deliberately checked the description of this super energy barrier.

But it was as he expected.

Although the star shelter is upgraded, it comes with a super energy barrier.

And this super energy barrier is still able to resist mental and physical attacks, a double defense barrier.

But limited by the level of the star shelter itself, the defense capability of this super energy barrier is not particularly strong.

If you have to make a quantitative comparison.

Its defensive ability can probably only resist it.

A spiritual or physical attack launched by an evolutionary whose genetic evolution level is around the peak of level seven.

If the strength is higher than the peak of the seventh level of genetic evolution, basically the effect of defense will be greatly reduced.

Of course, continue to upgrade the level of the star shelter.

This super energy barrier will be further strengthened.

In general, Li Chen is quite satisfied with the upgrade effect.

The reason why he is so anxious to upgrade the level of the star shelter.

The reason is naturally very simple.

He has seen those incomparably powerful Star Destroyer motherships in outer space more than once.

Even the "Dyson group" of the shadow organization could not effectively resist that kind of attack.

Although at present, the defense of the star shelter can already resist all weapon attacks on the earth.

But those hot weapons on the earth are definitely not the same as alien technology.

In order to avoid any unexpected situation, Li Chen must consider various possibilities.

After all, the total population of today's star refuges is calculated in billions...

Thinking about it, Li Chen reopened the synthesis panel.

Consumed 5.5 trillion evolutionary energy and 10 million first-generation eighth-order energy crystal nuclei.

Synthesize a [Star Refuge Upgrade and Enhance Blueprint] again.

After successfully synthesizing the drawings, Li Chen thought about it.

"This kind of blueprint can unconditionally increase the level of the star shelter to 5 stars...then just make another one!"

Thinking that he synthesized another upgrade blueprint.

After the synthesis was completed, Li Chen opened the holographic map to check it out.

The overall situation of the current star shelter.

After upgrading to three stars, the area of ​​the star shelter becomes very, very huge.

Now it has truly surpassed the entire area of ​​Donghai City.

It's like a super underground city.

Its east-west length exceeds three hundred and sixty kilometers.

The north-south width has also reached about 280 kilometers.

The total population capacity can accommodate about 20 million people while maintaining the healthy operation of a city.

The maximum population limit is 35 million.

"I don't know how much this capacity will increase if I continue to upgrade to four stars..."

Li Chen thought to himself, and immediately used another upgrade blueprint without hesitation.

Upgrade the star shelter, plus the defense of the super canopy covering the entire Y province.

It can be said that it is like a paradise.

The safety factor has risen sharply.

As Li Chen once again chose to upgrade the star shelter.

Noah's notification tone also followed and resounded through every corner of the entire shelter.

At this time, most of the survivors in the entire star refuge have not recovered from the surprise.

I heard Noah say again that the star shelter is about to start upgrading.

These commanders, persons in charge, and ordinary residents were all dumbfounded and astonished.

"Upgrade again? What kind of operation is this!"

"The upgrade has just been completed, and the defense and area have been greatly improved! Didn't expect to continue to upgrade?"

"Our star refuge is going to be built into a super underground city, right?"

"Super underground city... I'm really looking forward to it!"

"Yes, there is a super-canopy protection in the sky outside, and a super-powerful star shelter underground to provide us with stronger defense protection! We no longer need to worry about safety issues..."

"These are operations in response to alien invasion?"

"..."

Following Li Chen's second star-rated shelter upgrade operation.

This time, even ordinary survivors.

Finally began to realize that things are not easy.

Amidst the speculations of everyone, time passed by every minute.

Soon, the star shelter was upgraded again.

It was the same as what Li Chen judged.

This time, the overall defense capability of the star shelter has of course been increased several times.

The average thickness of the shelter alone has reached 300 meters.

Moreover, the material has been further upgraded, using a super synthetic metal with stronger defensive capabilities.

The area has also increased further than when it was three-star.

The shape of the entire refuge has not changed much.

But the length from east to west exceeds 500 kilometers, and the width from north to south also reaches about 400 kilometers.

This makes the entire star shelter, the total population capacity.

It is ensuring that the entire shelter can operate healthily, that is, there is sufficient food, sufficient jobs, sufficient energy supply, and so on.

All aspects are maintained within a very reasonable and normal level of population capacity.

Probably around 40 million people.

If overloading is allowed, the upper limit of the total population can reach about 60 million.

Of course, the most important thing is that after upgrading to four stars, the strength of the super energy barrier that comes with the star shelter has been further strengthened.

Not only is there an extra layer compared to the original single-layer double-defense super energy barrier.

In other words, it is equivalent to having two layers of barriers that can resist mental and physical attacks at the same time.

Moreover, the defensive power of this super energy barrier has reached a level where it can easily resist the attacks of people with eighth-level peak abilities of genetic evolution.

"The area of ​​the four-star refuge is already equivalent to the size of two cities."

"The defense capability has also been further strengthened..."

"The upgrade blueprint for Lv1 can be used again to directly upgrade it to a five-star level!"

"The other thing is that I don't know, can the defense of the super energy barrier be strengthened with this unlimited blueprint?"

Li Chen thought silently in his heart.

Since this kind of blueprint is called [Star Shelter Upgrade and Strengthen Blueprint].

This means it can be used for more than just upgrading star shelters.

It can also be used to directly strengthen the various functions of the star shelter...

Thinking of this, Li Chen decided to try it first.

"Noah! Can you see the super energy barrier that can strengthen the current star shelter?"

Li Chen issued an order in his mind.

Immediately got a positive answer from Noah.

[Answer the host, yes]

[This 'Star Refuge Upgrade and Strengthen Blueprint' was created specifically for this purpose! 】

Noah's words moved Li Chen's heart slightly.

But he didn't ask right away.

Instead, he nodded.

Using the strengthening blueprint in his hand, he strengthened the super energy barrier.