Xu Xin chose to keep this man.

Although this man looks very stupid, he is the owner of a world tree.

And from his mouth, we learned that this man's father belonged to the management among the survivors. Although he had little say among the alien invaders, he also had an extraordinary status among humans.

Keep him, he might be of great use in the future.

But of course we can't let him get too comfortable.

Xu Xin directly let out the treasure chest monster that had not been released in his bracelet for a long time, and let the treasure chest monster swallow the man directly into its stomach.

The man's look of fear and despair in the last second when he was in the belly of the gold-eating treasure chest monster made Xu Xin nod with satisfaction.

"Don't kill him, let him live." Xu Xin instructed the treasure chest monster.

The lid of the treasure chest monster opened and closed twice with a "click".

Xu Xin collected the treasure chest monster again.

"I didn't expect you to have something like this, brother?" Xu Ying exclaimed in surprise. "A treasure chest monster? This is truly... Could this be another product of genetic experiments conducted by those alien invaders on some creature?"

"...Can genetic experiments produce something like this?"

"Maybe. Who knows? Anyway, those alien invaders looked much stranger than this treasure chest monster. I wouldn't be surprised if they could make something like this."

Xu Xin and the other person first went back to the explorer's location in the World Tree and explained the situation.

Then, with Li Wenxi's somewhat worried instructions, the two left.

…

Looking at the towering tree in front of them and the endless sea behind them, Xu Xin and Xu Ying were both shocked.

Xu Xin looked at Xu Ying and spread his hands, saying, "It seems they are not completely without control over the underground world under the ocean."

The roots of the World Tree will drill into the underground world along the island and affect the underground world.

"...Not necessarily. Although there is island ground here, it is not necessarily the location of the supporting pillar, right?" Xu Ying retorted.

"If not, why would they plant the World Tree here?" Xu Xin shrugged.

"Hmm...it's possible." Xu Ying thought about it, then said with relief, "But it doesn't matter. The location of our underground human base is perfect. There are no islands above it, and it's not near the support pillars."

"That's good."

Xu Xin turned and looked at the World Tree.

"I wonder if those three have received any information." Xu Ying looked at the World Tree, wondering how to enter it. "Have they arrived yet? Or haven't they arrived yet?"

At the same time, Xu Xin's mind moved, and a map of the nearby area appeared in his mind.

There were no living creatures on land, not even red or green. This was obvious, as the island was completely bare, with nothing but a single World Tree.

But the ocean is not so safe.

Xu Xin discovered that about two hundred meters away from the coast of the island, there was a dense gathering of scarlet light spots, which were constantly swimming in that area.

The brightness of each of these light spots exceeds that of intermediate mutant creatures!

They all gathered at this distance, and although they were swimming, none of them dared to cross this line.

Although Xu Xin did not open the entire map of the island, he speculated that the entire island was surrounded by these creatures.

"The sea is not safe." Xu Xin looked at the horizon.

He couldn't see anything with his naked eyes.

"Yeah, it's definitely not safe. There are a lot of monsters in the sea." Xu Ying also looked back. "But the beach here is okay because it's guarded by the World Tree. Those sea monsters don't dare to get close."

Xu Ying gave a brief explanation.

If the World Tree had not been planted on this island, the sea monsters might not have had much impact on the island.

Not interested, but they might land on the island from time to time, like turtles breeding and laying eggs.

Because of the World Tree, the sea monsters did not dare to approach but were attracted to it.

It's like a group of flying insects flying around a light bulb but unable to actually touch the light source.

The World Tree is the wick in the light bulb, and the sea monsters are the flying insects.

This is also the reason why this place is surrounded by a large circle of scarlet light spots.

"Don't worry, those sea monsters can't get in." Xu Ying stopped paying attention to the sea level and looked towards the World Tree. "Shall we... go over there?"

"Is there any way to get in?" Xu Xin asked.

"That person gave me the coordinates of the World Tree. Actually... I could have teleported directly there," Xu Ying explained. "But he said his superior is inside..."

"The 'superiors' he mentioned are probably just humans, right?" Xu Xin asked. "They're probably the survivors of the invasion."

"Well, it's not dangerous for me. I'm just worried that my presence will be discovered and then spread to the other hemisphere..." Xu Ying hesitated for a moment, then shook her head. "Forget it, we'll figure it out when the time comes. Let's go in and take a look."

As she spoke, she grabbed Xu Xin's arm.

…

Lou Feier and the other two were already inside the World Tree.

"Here..." Lou Feier was a little surprised.

So this is what the inside of a normal World Tree looks like...

A normal world tree is actually a big tree house.

The interior of the tree house is more than 100 meters high and covers an area of ​​about one kilometer in radius. The internal space is also very large.

Of course, compared to their tree house that was affected by time and space, this place is still a bit stretched.

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