Chapter 667 Arrival

Behind him came the increasingly distant shrill screams of those giant bats.

Hui Hui's speed did not slow down and he continued to fly forward at the fastest speed.

After about two minutes, there was no longer any sound of bats behind him, and Xu Xin breathed a long sigh of relief.

"They probably won't be able to catch up, Hui Hui. If you're tired, just slow down a little. We still have three hundred kilometers to go."

"Yeah -" Huihui shouted, his speed slowing down slightly, but not too much.

Next to Xu Xin, Lao Yang, who had been leaning down on Hui Hui's back, stood up straight and glanced behind him: "Get rid of it? Use the core of the tree house to attract their attention. Your method is really good."

"Don't you know that the core of the tree house can attract them?" Xu Xin asked.

"I'll know if you do this." Lao Yang turned around, took out his dashboard and operated it, and said at the same time, "We don't usually come into contact with purebred behemoths. Even in experiments, they are all covered with blood marks. It’s a giant beast, so I don’t know much about this purebred giant beast.”

I see.

Xu Xin looked forward.

This tunnel is very wide and relatively straight. After flying for three or four minutes, there are still no rugged roads. Although it is not straight, the general direction is generally correct.

No wonder those giant bats would regard this as their gathering place. With their size, this is where they can fly freely.

but……

Since giant bats live here, then...

"Keep moving forward. There is no problem with the direction." Lao Yang raised the instrument panel in his hand and gave Xu Xin a look.

Xu Xin nodded: "Hui Hui, just keep moving forward."

As he spoke, he took the little guy, who was still holding on to his arm and trembling a little, into his arms.

"ah--"

"Hey..." Keke was held in Xu Xin's arms, and she was no longer so scared. She raised her little head and glanced ahead, then buried her in Xu Xin's arms again.

It's a little afraid of heights.

Moreover, Hui Hui's speed is also very fast now. Even in this not-so-open tunnel, the speed is at least more than 300 kilometers per hour. Without the protection like an aircraft, Ke Ke will certainly be afraid.

But hurry up. At this rate, we should be able to arrive within an hour.

Even the oncoming wind made it hard to open his eyes, Xu Xin leaned over Hui Hui again.

Lao Yang next to him also made the same move.

"The speed of this pterosaur is much faster than I imagined." Lao Yang said.

"Have you ever come into contact with a pterosaur like Hui Hui before?" Xu Xin asked.

"I have come into contact with this kind of pterosaur. It is a partner that only order maintainers can have. Compared with our aircraft, although it is much slower, it is more flexible.

Moreover, their own strength and recovery ability are also very strong. Unlike our aircraft, which cannot be repaired if they break down, they can repair themselves very quickly even if they are seriously injured. They only need to provide necessary things, so they are deeply protected by order. Loved by readers, each of them will keep one, but yours is... a bit special. "

"Oh? What special method?"

"Yours... is much bigger than the ones I've seen before, and this speed..."

Lao Yang raised his head, unable to close his mouth due to the oncoming wind, so he had to lie down again and said: "This speed is much faster than what I have experienced before. However, maybe it is because of what I have experienced before. Those pterosaurs weren’t flying with all their strength.”

Is there something special about Hui Hui...

If Lao Yang knew that Hui Hui was only a few months old, he would probably be even more surprised.

"ah--"

After Hui Hui shouted, he suddenly sped up and directly increased his speed a little.

Although the speed at this time caused the surrounding wind to be very strong and whistling in the ears, Hui Hui could still easily hear Xu Xin and the others.

It seems to be saying, look, the speed just now is not my limit, I can go faster!

"Hui Hui, there are still more than two hundred kilometers to go. Don't waste your energy, otherwise you won't be able to fly later." Xu Xin immediately stopped him.

"ah……"

Hearing what Xu Xin said, Hui Hui slowed down again and stabilized at the previous speed.

It seems that this speed of about three hundred kilometers per hour is the speed at which Hui Hui can fly and glide for a long time.

This is really fast.

According to archaeologists' calculations based on existing fossils, the Pterosaurus pterosaur, the overlord of the sky during the Cretaceous period, could fly at a speed of up to 107 kilometers per hour. Huihui's speed was three times that of the pterosaur overlord hundreds of millions of years ago!

This is still in a tunnel with rugged terrain in the underground world. If we were in the air and traveling with the wind, we might be able to go faster!

"Huh...?" Coco suddenly poked her little head out of Xu Xin's arms, blinked, and then retracted.

"...?" Xu Xin lowered her head and looked at the little guy in her arms.

What did the little guy discover again?

However, since it is not in a hurry, it means there is no danger.

but……

"There are definitely not just these giant bats around here." Xu Xin said.

"Yes, I know." Lao Yang nodded, "Since this group of bats can survive here, it means that there is a complete food chain here to support their lives."

The bright flashlight in Xu Xin's hand kept shining light forward for Hui Hui. He took out another bright flashlight and shined it downwards.

"this……"

He was surprised to find that there was a whole other world down here!

This long cave tunnel is really a small ecosystem.

Xu Xin saw a stream of water flowing through the tunnel, forming an underground river.

Because of the noise of the wind, he didn't hear the sound of running water below. He only discovered the situation after using a flashlight.

And there are various creatures beside this underground river.

These creatures look like insects, but are as huge as tigers. Seeing them in this dark underground space makes people feel a little creepy.

"It turns out that there are still giant insects living there. But these insects..."

Hui Hui's speed was very fast, and every bug disappeared almost in the blink of an eye, but Xu Xin still captured the appearance of several bugs.

It was completely different from the giant insects he had encountered before.

He basically knew all the giant bugs before. Most of them were the bugs he was familiar with before and they were just enlarged. But the giant bugs here were all weird and even a little scary.

"This should be an ecosystem." Xu Xin said, then looked at Lao Yang and asked, "Have you never encountered such a situation when you were traveling in the underground world? You encountered a giant beast, and then the aircraft was destroyed. "

Lao Yang shook his head: "Of course I have encountered giant beasts. The underground world is full of giant beasts. But I have never encountered them near here."

He also looked down and said in surprise: "I didn't expect that there would be giant beasts living here. It is only five or six hundred kilometers away from the headquarters of the alien invaders, right? But this is never allowed. The experimental ones should not be artificially released, maybe they migrated here on their own? I can’t believe that the giant beasts in this underground world have expanded here..."

Thinking of the situation just now, Lao Yang couldn't help but feel a little palpitated, and laughed at himself: "I really haven't experienced such an exciting thing in hundreds of years."

"What's this?" Xu Xin turned to look at Lao Yang and said with a smile, "What we have to do next is much more exciting than this."

"That's what you have to do next, not me." Lao Yang put away the firearm still in his hand and said with a wry smile, "I'm old and can't afford to do that. Just leading you the way is enough." It’s enough to scare you.”

"... He's over a thousand years old, but his body is still much stronger than mine." Xu Xin said with a slight twitch of the corner of her mouth when she heard this.

"Stronger than you? Haha, that's just an appearance."

Lao Yang turned around again and took a look to make sure that there was no giant bat chasing after him. Then he relaxed his expression and said, "I don't have a few years to live. Do you really think we can live forever?"

Xu Xin's eyelids twitched: "What do you mean?"

"The alien invaders do have very exaggerated life-prolonging drugs, but... do you think they can give us humans that kind of drugs?" Lao Yang glanced at Xu Xin and said.

ah……

Xu Xin couldn't help but glance at Lao Yang.

Yes, if this drug really existed, how could it be used on humans?

Xu Xin and the others had indeed been injected with genetic medicine that could almost make them immortal, but that medicine was not given by alien invaders, but was developed by an organization from another time and space.

Now that I think about it, the prerequisite technology for this drug should have been given to their organization by the monster, right?

But Lao Yang was not so lucky. The survivors in this time and space did not have any organization that researched the elixir of immortality.

"Our lifespan is longer than that of ordinary people, and our appearance does not age. This is because of blood pattern mutation."

Lao Yang pulled down his high collar, revealing the blood lines on his neck.

There were no blood lines on his face, but there were still some on his neck, which was similar to the situation with Lou Fei'er before.

"The blood pattern mutation has changed some of our genes, giving us a longer life, but life will eventually end. For example, my end should be approaching soon." Old Yang sighed, "The blood pattern human race has died. His age is probably more than a thousand years old."

"you……"

Xu Xin opened her mouth, but she didn't expect that Lao Yang was about to die?

"How long do you have...?"

Lao Yang sighed again: "Probably, there are only less than a hundred years left."

Xu Xin: "? How much?"

"I'm going to die in less than a hundred years." Lao Yang's expression was very melancholy. "The reason why we choose to help you is that our life span is also very important. Anyway, we are going to die soon, so why not try Let me help you fight."

He then smiled: "To be honest, if you had come hundreds of years earlier, we probably wouldn't have been able to help you."

Xu Xin: "I..."

He didn't know where to start.

With a hundred years left to live, is this the end of the road? Dying?

Good guy, if ordinary humans can live to be a hundred years old, they will be able to be enshrined as century old people, and five generations can live together!

The other party's tone and expression were so melancholy. He thought Lao Yang would live in just a few years...

"...According to your statement, ordinary people are about to be buried as soon as they are born."

Xu Xin couldn't help but complain.

"Huh? Ah..." Lao Yang was startled for a moment, then smiled sheepishly, "Your concept of lifespan may be different from ours. I have lived for thousands of years, and in my opinion, a hundred years is, It's really not that long.

Let me think about it... Just like an ordinary human being, an eighty-year-old man, even if he may live another ten years, he will feel that he is dying every day. I am in such a state now. "

If explained in this way, it seems that it is indeed the case.

"Then we are really lucky to find you just when you are about to die." Xu Xin said angrily.

"Uh... I'm serious." Lao Yang said helplessly, "Forget it, your concept of life span is indeed different from ours, just forget it if you can't understand it."

"You don't look old at all, I really can't understand it." Xu Xin shrugged slightly.

"We will start to age in the last ten years of our lives. We already have three such people in our team, and one of them has already left us." Lao Yang said.

It turns out that some survivors have died of old age.

Being able to live for more than a thousand years and then die is a blessing for the survivors.

"I don't understand your view of lifespan yet. Maybe I will understand it in the future."

Xu Xin's current life span is longer than that of Lao Yang.

His current situation is that his natural lifespan is very long, and dying at the end of his life does not exist for him.

If he died, he could only be killed.

Serious injury, poisoning, hypoxia, incurable serious illness, etc.

Therefore, if he could live for a few hundred more years, he might be able to understand Lao Yang.

But the prerequisite for him to live for hundreds of years is...

This operation must be successful.

If this operation is unsuccessful, it will be useless no matter how long he lives, or he may die directly at the hands of alien invaders.

"Huihui, are you tired?"

"Yeah -" Hui Hui yelled to show that he wasn't tired.

"That's good."

…

"Hui Hui, there will be two caves in front of you, two large and one small, that you can pass through. Choose the one in the middle." Xu Xin said.

"ah--"

Xu Xin looked forward.

More than an hour has passed.

It didn't arrive within an hour as he imagined. The closer they got, the more rugged the terrain became. Before half an hour, they couldn't find a road that could fly straight for more than half a minute.

It's almost like turning left and right.

If there is a flying shuttle, it may be faster. After all, it calculates the route by itself.

But now, relying on Lao Yang to look at the dashboard for manual guidance, Hui Hui's speed has inevitably slowed down a lot, and he has even been pointed out the wrong way several times.

Now the dashboard has been snatched away by Xu Xin.

"We'll be there soon. Look at the ground."

Lao Yang pointed downward.

Xu Xin looked down.

I saw that the bottom at this time was no longer entirely composed of various rocks.

Extremely thick tree roots have begun to appear here.

After flying for another ten seconds, these tree roots became more and more numerous and dense.

These extremely thick crowns are intricately intertwined and interspersed on the ground, stone walls, and tops of this area.

The green roots bring vitality to this dark area, making it look much more comfortable.

"The roots of the World Tree?" Xu Xin raised his eyebrows slightly.

"Yes. It's right in front."

A minute later, light appeared ahead.

There was no need for Xu Xin to turn on the flashlight, Hui Hui could see clearly ahead.

"ah--"

It flapped its wings, like a marathon runner launching a final sprint, and its speed suddenly accelerated.

Xu Xin also let out a breath.

finally reached.

Their plan can really start to be implemented!

However, more than two hours have passed since they left World Tree.

I don’t know, what’s going on over there?