Starting Off Survival With A Small Treehouse

All three of them could clearly feel that the ground beneath their feet was shaking slightly.

"The roots of the World Tree can also take root in the underground world..."

Xu Xin looked at the magnificent scenery in front of him that he participated in creating, and said to himself.

"That's right, but it can't spread as well as above the ground." Xu Ying said with some pity, "After all, there is a soil-free area with a vertical distance of up to three thousand meters in the underground world. The roots of the World Tree can penetrate into the underground world like this. The ground is almost at its limit."

"Can't the root system of the World Tree be able to extend to areas hundreds of kilometers away?" Li Wenxi felt the vibration under her feet, "Then if there was no such a hollow underground world underground, would its root system be able to extend all the way down? ?”

"I'm not sure about this, but judging from the situation above, it will at least be deeper."

Xu Ying looked up at the dome.

The intricate root system fills the dome above several people.

These roots have already drilled out of the dome, and countless roots are crawling all over the dome, as if telling their dissatisfaction.

They still want to drill down, but there is no soil, rock, etc. to allow them to drill.

The feet were still shaking, but the giant beasts and insects on the ground were no longer as panicked as before. Instead, they calmed down and lay on the ground one by one, as if they were feeling something.

The three of them were also waiting for the shaking to stop and for the roots to fill the area.

"Hey, you said, this underground world can't be spread all over the world, right?" Li Wenxi asked the doubts in her heart.

"Huh? Are they all over the world?" Xu Ying turned to look at her and said, "There should be no problem with this, right?"

"In that case... What is the ground supported by?" Li Wenxi stretched out her slender fingers and pointed upwards.

"Ah, you said this, there must be support." Xu Ying explained, "Although the underground world is all connected together, but every certain distance, there is a tree that is more majestic than the mountains and has a diameter of at least dozens of meters. Kilometers, even hundreds of kilometers of 'support pillars' exist, so don't worry about that."

Xu Xin imagined it.

A "supporting column" with a diameter of hundreds of kilometers and a vertical height of only 3,000 meters...

It is more appropriate to say that it is a "support pillar" rather than a "support plate".

A... stepping stone to the Earth's crust?

He looked around.

Unfortunately, in this underground world, only this area has some light, and the source is the light source where the main vine bundle connects to the dome.

Further away, it was pitch black.

Even if he eats a red berry, he still can't see very far away.

"You don't have to look around, there isn't one here." Xu Ying reminded, "That kind of 'support pillar', based on the distance on the ground, will only have one at least every two thousand kilometers."

Why do we say "based on the ground distance"? Because the underground distance and the ground distance are different.

The underground world is closer to the center of the earth. If you count the distance of the underground world, it is definitely shorter than 2,000 kilometers.

"Two thousand kilometers? That's really far away..." Li Wenxi said in surprise, "If the earth hadn't gotten bigger, there wouldn't have been many roots on the entire earth, right?"

"That's not the case." Xu Xin calculated, "The equator is more than 40,000 kilometers away. There are about 20 roots on the equator alone, and even more on the entire planet."

Now, the surface area of ​​the earth has expanded a hundred times.

At first glance, each of these support pillars sounds like they are two thousand kilometers apart. In fact, considering the current size of the entire earth, they are very densely distributed.

No wonder the entire earth's crust and the above-ground world can be supported.

Xu Ying pointed upward and said: "And this is the location we specially selected. It is far away from every 'support pillar', and the nearest support pillar is nearly a thousand kilometers away."

"Why do you have to be the farthest away from every support column?" Xu Xin wondered about this, "Going far away from the support columns?"

"That's right!" Li Wenxi imagined the appearance of the support pillar, "If we plant the World Tree on the 'support pillar', wouldn't the root system of our World Tree be able to extend downward? Such a World Tree should Be stronger!”

"That's right." Xu Ying pursed her lips and said, "But if we can think of this, how could the other party not think of it?"

"The other party...ah." Xu Xin understood immediately: "You mean, those alien invaders' World Trees are actually planted on the 'support pillars'?"

Xu Ying nodded: "Yes, that's it. The World Tree planted on the 'support pillar' will not only affect a large area on the ground, but the root system will also extend downward from the 'support pillar' and enter the ground The ground of the world continues to spread. In that case, with only one World Tree, they can easily control large areas of the surface world and the underground world."

As she spoke, there was a hint of helplessness in her tone: "This is how those alien invaders took over the earth."

"They first developed the World Tree seeds that can be carried around, took these seeds to find the 'support pillars', and then planted them. In this way, their dominance can continue to expand in the dual worlds above and below the ground. Now, they have even occupied Half the world.”

Xu Xin and Li Wenxi looked at each other, and they could see the shock in each other's eyes.

This method... is convenient, fast, and simply incomprehensible!

It's as if countries on Earth thousands of years ago planted their own flags in an area, indicating that this area is their territory.

And they don't have to do anything next, because that flag will help them occupy this area! He even occupied the underground world by the way!

This is really...

"...Wait a minute, wait a minute, I remember you said before that the range of World Tree's influence is only a few hundred kilometers, right?" Li Wenxi suddenly asked.

"Well, the normal radius is about five to six hundred kilometers." Xu Ying nodded.

"But there is a distance of at least two thousand kilometers between those 'support pillars'." Xu Xin thought, "In other words... there is a large area between the two World Trees that is not affected by them. of."

"Bingo!" Xu Ying clapped her hands, "Yes, that's it!"

"To put it simply, it is similar to the safe area before your little tree house. The area affected by the World Tree is the 'safe area' of the alien invaders, and the area not affected is their 'danger' area'.

"And we are now in the opponent's 'danger zone', and we are also the core hinterland of the 'danger zone'. We chose to build Crystal City here because of its location."

Xu Ying has explained it very clearly.

"It's actually like this..." Xu Xin whispered to herself.

From this point of view, perhaps all their survivors are in the "danger zone" that is not affected by the World Tree.

Because World Tree will obviously affect the growth, ownership and transplantation of small tree houses.

In order to eliminate this factor and select the survivors, they will definitely not choose to let the survivors play this survival game within the influence of the World Tree.

Of course, it may also be because they don't want the "insects" of survivors to get too close to them.

In any case, the current survivors should be considered relatively lucky, at least they are not under the control of the other party's World Tree.

"Um, that is to say, there is a World Tree nearly a thousand kilometers away from us?" Li Wenxi asked at this time, "Actually... it's not very far."

It was almost the same distance from the Imperial Capital to the Demonic Capital on Earth a thousand years ago.

"Yes." Xu Ying nodded, "But when we built Crystal City, they basically didn't care about it."

"Don't care? Why?"

"Because those alien bastards mainly live on that half of the planet. It's the place where Shi Wanyun went."

Xu Ying squatted down and touched the ground, feeling the increasingly faint vibrations under her feet, and said at the same time: "The underground world is so rich in resources, and the number of alien invaders is not large. They have no population pressure and no shortage of survival. If you use research resources, there is no need to spend energy on expansion to occupy large areas of useless area.”

Xu Xin was silent for a moment and said: "But now... we can't be so optimistic."

They have already planted a world tree here!

With this World Tree, they have their own territory and the ability to compete with their opponents.

Now this must be their key area of ​​focus.

"Then... what if the other party plants another World Tree around our World Tree in order to restrict us?" Li Wenxi put forward a hypothesis, "Will it compete with our World Tree for territory and affect us?"

"As far as I know, no." Xu Ying stood up and said, "As far as I know, the World Tree follows the principle of first come, first served. This area has been occupied by our World Tree, and other World Trees have even It can no longer grow on this land, unless it is...'parasitic'. This is the 'protected area' of World Tree."

"And if a new tree is planted outside the 'protected area', based on the 'first come, first served' principle, the roots of the world tree planted later will not be able to spread here. There will be two worlds at most. The 'protected areas' of trees are connected."

As she said this, she smiled: "In fact, you should be familiar with this. In fact, it is similar to your little tree house. The little tree house is a degraded version of the World Tree, and the properties of the two are basically the same. "

ah.

Indeed it is.

But they still don't know much about the details.

After all, they only knew that the safe areas of the tree house were connected. There was no danger zone in this area at that time. Who knows about the "first come, first served" principle and how the root system of the tree house below is distributed.

Xu Ying's explanation did let the two of them know a lot of details.

"The shaking has stopped." Xu Ying raised a smile, "Now, this area is our territory!"

"Where are those giant beasts?" Xu Xin asked.

"If they dare to attack us, just kill them!"

Saying that, Xu Ying waved her hand upward.

In an instant, a thick root with a sharp head drilled out of the ground!

These thick roots can probably cause considerable damage to giant beasts!

"Ah!" Li Wenxi was so shocked that her mouth opened wide, "You can control those roots!"

"Hehe, that's right! My brother can do it too."

Xu Xin is already trying.

"Click!"

A thick root burst out of the ground with his consciousness!

"Successful!" Xu Xin's eyes flashed with shock. He turned to look at Xu Ying, "Can it also be done on the ground..."

"Yes, but the range that can be controlled is not very large. It is probably the area covered by the canopy of the World Tree." Xu Ying thought for a while.

That is already very strong!

The World Tree canopy now basically covers the entire Crystal City, right?

He was excited, and another thick and sharp root came out of the ground!

Several giant insects on the ground were directly lifted away!

So strong!

"Um……"

Xu Xin suddenly frowned.

He felt tired.

It's coming fiercely, sweeping over like a wave!

His feet were even slightly weak.

Li Wenxi also quickly supported him and said nervously: "What's wrong? Why suddenly..."

"Ah, you have to control yourself, brother!"

Xu Ying also quickly came over to support him.

"You just controlled the roots of the dome, and now you have controlled it twice in a row. You must have reached your limit, right? It's not that easy to control the World Tree. I have super mutated physical strength and more than three hundred years of mental strength. , I already feel exhausted.”

Xu Xin is indeed exhausted both physically and mentally.

Counting the roots that controlled the dome just now, he controlled the roots of the World Tree seven times in total.

This number of times is enough!

Xu Xin smiled.

Although physically exhausted, he was in a good mood.

"Still smiling! You look so pale!" Li Wenxi supported Xu Xin and turned to look at Xu Ying, "Are you tired or injured?"

"I'm just tired. My body is overstretched." Xu Ying was not worried, "Just take a rest and you'll be fine."

"No need." Xu Xin took out a few blue-level fruits and ate them, "Just recover a little bit. Can we go over there and have a look now?"

Xu Xin looked at the main vine bundle.

Surrounded by dozens of World Tree roots, the main vine is still the most conspicuous.

It is much thicker than the roots of the dozens of World Trees around it!

Even thicker than the main trunk of the World Tree.

"Well, go and have a look, it's safe now."

As she spoke, she directly grabbed the hands of the two of them and teleported again.

The three of them arrived at the main vine in an instant.

"Your teleportation is really convenient..." Xu Xing sighed.

"Huh? Wait, can't you teleport to places you haven't been before?" Li Wenxi suddenly thought of this and felt a little strange, "You just teleported directly to the underground world below us, right?"

At the beginning, Xu Ying couldn't teleport from the ground of the underground world to the dome, a distance of three kilometers.

From the ground to the underground world, it is much farther than three kilometers.

"It's not normal. But this place is affected by the World Tree." Xu Ying opened her eyes and looked at the main vine bundle at close range, and explained at the same time, "I'm teleporting in my own home, can something go wrong?"

"Ah...that's right!"

"Let's go in and take a look." As she said that, Xu Ying grabbed their hands again.

Teleport.

Directly entered the underground prison.

The familiar metal prison, the familiar spiraling downward staircase.

"Oh, this is the underground prison!"

Xu Ying looked at this huge underground prison that spiraled downwards, secretly surprised in her heart.

"These materials are all meteorite? They are all meteorite! Those alien bastards are really luxurious..."

Li Wenxi tugged at Xu Xin's sleeve: "Xu Xin, is this the prison you are talking about? But... why are these cells empty?"

Xu Xin was also in deep doubt at this time.

He thought that as soon as they entered, they would hear the noisy chirping of giant insects in the prison.

Because when they left last time, it was filled with giant insects and beasts.

result……

empty?

empty.

Throughout the underground prisons, in the prisons where violent behemoths were originally held, at this time...

There is no beast!

At a glance, it was completely empty, not a single mutant creature.

Where have all those mutated creatures gone?