"More than a thousand kilometers, two hours?"
Xu Xin repeated it.
Xu Ying also looked at the man: "Five hundred kilometers per hour, this speed is not slow at all in the underground world. Have you... prepared the vehicle for us to ride?"
"certainly."
The man nodded.
"Since I'm responsible for providing you with the location, I will naturally help you get there. In the underground world directly below this world tree, we have placed a flying shuttle. You can take this flying shuttle and travel through the underground world."
Flying Shuttle...
Xu Xin thought of the army of flying vehicles that were like a swarm of flying insects fifty or sixty kilometers away when he left the World Tree.
Could it be that kind of flying machine
"What you provided is the aircraft of the alien invaders, right?" Shi Wanyun asked, "Will the alien invaders really not notice if they use this aircraft?"
Can the military equipment of alien invaders really be used at will
"Don't worry about that. This aircraft is used by our organization." The man explained.
"This aircraft was actually one that needed to be scrapped due to a malfunction a hundred years ago. We did not scrap it, but collected it and modified it. The positioning device had long been removed, and many anti-positioning devices were installed on it. It may not be able to escape the tracking of alien invaders above the ground, but it is completely fine in this underground world, as long as you don't get too close to their base.
Members of our organization have been traveling between underground worlds in this way and communicating for hundreds of years, and have never been discovered by "maintainers of order" or alien invaders, so you can rest assured."
So that's how it is.
Xu Xin nodded.
The "organization" that the man mentioned is the "rebels" of this time and space. Because they are too weak, they have only been able to communicate secretly underground for thousands of years.
They didn't even dare to use communications, because all long-distance communications required the use of the alien invaders' satellites, which were likely to be intercepted and eavesdropped by the "maintainers of order." So over the past thousand years, they had developed the ability to come and go without a trace in the underground world.
"You guys are really amazing..." Xu Ying expressed surprise at the methods used by the rebels in this world, and then asked, "Why didn't you tell us the last time I talked to you?"
"I didn't completely trust you the last time I talked to you," the man said, "didn't you also not completely trust me?"
That's true.
The conversation between the two sides was not pleasant at the time, and basically no consensus was reached at the beginning.
Fortunately, Xu Xin and his team later found a monster and let it serve as a bridge between the two sides.
When the man saw that the monster could speak and communicate stably, he couldn't believe what he saw.
Later, the two sides exchanged some information and finally reached an agreement.
"Although I still cannot believe that you will succeed, the alien invaders have indeed already sent their troops, and everything is just as you said." The man said, "So, we decided to spare no effort to help you. Of course, you also have to do as you said before, not to expose us. We also have to leave ourselves a way out."
As long as they are not exposed, they can still survive even if Xu Xin and his team fail.
"Don't worry, exposing you won't do us any good." Xu Xin waved his hand, "In that case, we won't waste any more time, let's go now. Shi Wanyun, you..."
Shi Wanyun said softly: "I will do what I should do. You have to be careful."
Shi Wanyun's abilities have nothing to do with combat, so she naturally won't go with Xu Xin and the others.
But, Shi Wanyun is the owner of this world tree.
And this place is surrounded by the vast ocean. For alien invaders, this is definitely a place they don't want to come to.
Therefore, this is also their retreat route.
If Xu Xin and his team failed, there would be no point for Ji Chaoyang and his team to continue persevering.
Then they can transfer directly from the inside of the World Tree to the other World Tree.
They are not going to do this with all their might, they have to leave a way out for everything.
The last time Xu Xin came here, he had already set up the coordinates here and connected it to the interior of the World Tree.
Although the inside and outside of the World Tree have poor compatibility due to the difference in the speed of time flow, making communication and teleportation impossible, as long as the speed of time flow inside and outside is adjusted to be consistent, teleportation and communication can be achieved.
In other words, once Xu Xin and his team failed, or Ji Chaoyang and his team could no longer hold on, they would directly adjust the flow rate difference and then transfer all the people in the World Tree to this island.
At this time, Shi Wanyun, the owner of the world tree, is needed to receive the personnel.
Of course, if this situation really happens, it does not mean that Xu Xin and the others will abandon the World Tree over there with a huge time difference.
Even if the World Tree over there cannot be defended, it will only be injected with toxins by the alien invaders and will wither completely.
But the time of withering is limited. It won’t be long before the World Tree grows back again because of its strong root system.
The alien invaders do not have access to the World Tree, so they cannot use it.
In other words, when the storm is over, Xu Xin and the others can still find a time to return to the World Tree.
This is the escape route they prepared for themselves.
It is not advisable to burn your boats because the gap between the two sides is too big in terms of strength and information.
The chances of winning are not great, and burning your boats is tantamount to semi-suicide, which is meaningless. Modern warfare cannot be resolved by morale alone.
"Okay." Xu Xin nodded, "Always be prepared. We may not be able to hold out for long over there."
"I'll send you to the underworld."
Soon, several people came to the underground world through the root elevator of the World Tree.
The underground world here is under the entire deep sea.
Moreover, because there are no crystal veins here, the underground world is pitch black.
When Xu Xin and his friends walked out of the World Tree's root elevator, it was completely pitch dark all around.
He immediately took out a tree house core and illuminated the surroundings.
But the range that can be illuminated is only a few dozen meters around.
There was no soil on the rocky ground, and the surroundings were extremely quiet, like a dark abyss, so quiet that it was frightening.
This was completely different from the underground world he had seen before, where monsters and terrifying beasts were everywhere.
This is an unexplored dark world.
"After all, this place is relatively close to the base of the alien invaders, only about a thousand kilometers away, so they don't conduct experiments on giant beasts here." The man explained to Xu Xin and the others again, "Also, there are no crystal mines nearby, so except for the area very close to their base, it is basically undeveloped."
Before the man finished speaking, suddenly, two columns of strong light shot out from about 200 meters away from the few people, illuminating the surrounding area.
Xu Xin and Xu Ying also saw the source of the strong light.
It was the flying shuttle the man had spoken of.
"Is this the flying vehicle you mentioned? It's so small..." Xu Ying complained while standing next to the flying shuttle.
This is a very small aircraft with three propellers on the left and right rear.
The interior space is very small. Excluding the driving position, only four or five people can sit in the back.
It is about the same size as the interior space of a car or a small helicopter.
However, the propellers are very large, and each one is longer than the cabin.
It looks like a large remote-controlled drone.
"This is our flying shuttle. This is a version suitable for the underground world." The man walked to the flying shuttle. "It's not very fast, but it's very flexible. It's very suitable for shuttling through some areas with complex terrain in the underground world."
As he spoke, the man opened the hatch and entered the cockpit: "You don't know how to drive, I will take you there."
Xu Xin and Xu Ying looked at each other, and then entered.
The interior space is really small. You can only sit in it like you are in a car and cannot stand up.
"Close the door, we're about to take off."
The propeller spun rapidly, carrying the entire fuselage into the air.
But what is surprising is that with three large propellers spinning at such a speed, there is basically no sound.
Silent propeller
"The sound is so quiet." Xu Xin exclaimed.
This technology is really confusing. The noise is probably not even as loud as a computer fan...
"Of course it has to be small. The purpose of this flying shuttle is to explore the underground world. If the sound is too loud, it will cover up some key sounds and attract a large number of giant beasts, so it must be secretive."
That’s not bad, at least we won’t be discovered by alien invaders because of the sound.
The sense of security is greatly enhanced.
The shuttle took off into the air, rising to a height of nearly a hundred meters above the ground.
"Hold on tight."
This area was relatively flat, so the flying shuttle immediately began to accelerate laterally.
After the strong push on my back, the speed began to stabilize.
At the same time, a headlight was turned on from under the shuttle, illuminating a large circular area of several hundred meters below.
"Wow... this thing is really good."
Xu Xin looked out the window.
The underground world is not entirely as flat as the human base in the underground world. After all, that place was specially selected. It can even be said that most of the terrain in the underground world is very rugged.
The terrain here includes up and down.
The ground and the dome are sometimes even connected together in large areas, like a huge cave.
Therefore, if you want to travel through the underground world, first of all, ground tools are impossible.
Among flying vehicles, ordinary airplanes, which are fast but not flexible, are absolutely unable to travel long distances.
The extremely flexible flying shuttle, which can even hover, is the most suitable means of transportation for traveling in the underground world.
But the flying shuttle has a disadvantage, which is that its speed is not very fast, at most only about 500 to 600 kilometers.
This speed is far from that of civil airliners thousands of years ago.
Fortunately, their destination was only a thousand kilometers away, and a speed of five or six hundred kilometers per hour was enough.
Fortunately, the location is relatively close. If this kind of shuttle is used to cross the ocean, it will be too slow. Especially now that the size of the earth is no longer comparable to the previous earth.
"Are you wondering, how can we explore this underground world if this shuttle is so slow?" the man who was driving the shuttle turned around and asked.
"Hey, can you please look ahead? Are you not concentrating on flying the plane? Aren't you afraid of a collision?" Xu Ying complained.
Five hundred kilometers per hour is already a very fast speed for humans.
Especially like now, it is less than a hundred meters away from the ground, which is basically equivalent to flying close to the ground.
Looking at the rapidly receding scene below, to be honest, it still feels a bit scary.
"Don't worry, this area is very open. We still have to go on for at least half an hour before we reach relatively complex terrain." The man said, "Also, the flying shuttle is on autopilot and can detect obstacles ahead several kilometers in advance. If it encounters an obstacle that is not complex, it will bypass it on its own. If it is a complex obstacle, it will slow down and warn you, so don't worry."
"I see. But this thing is over a hundred years old, there won't be any safety hazards, right?" Xu Ying leaned on the back of the driver's seat and looked at the dashboard in front of her. "This is an antique among instruments, and you got it because it was broken..."
"Don't worry, I'm the one driving it. I wouldn't dare to drive it if there was a problem." The man laughed, "To be honest with you, although this thing was scrapped due to a malfunction a hundred years ago, it wasn't actually a malfunction. We deliberately reported it as scrapped and then kept the money for ourselves. We dare not drive a flying machine that is about to be scrapped."
“… Wow, this is a familiar operation.”
"Ha ha."
The aircraft continued to move forward.
"Brother, put me into the bracelet, and I will explain the current situation to them."
"Okay." Xu Xin nodded, then took Xu Ying in.
Then he released Coco again.
Coco seemed to be running, and as soon as she came out, she dived into his arms.
"Hmm?" The little guy raised his head, then looked around in confusion.
"Your little pet?" The man turned around and looked at Coco in Xu Xin's arms, then said in surprise, "Ah, this little animal... Let me think... Red panda? It's a red panda, right? This animal is not extinct yet?"
"Boo? Boom!" Coco was immediately dissatisfied when she heard that. She waved her little claws to scratch the man's face in the air, and she wanted to swipe her big tail at the man's face, "Boom!"
"... The last time I saw this little thing was a thousand years ago." The man's voice immediately became a little melancholy, "I thought the red panda had become extinct a thousand years ago, but I didn't expect to see this animal again. Really... I miss it so much..."
"Can you remember things that happened thousands of years ago so clearly?" Xu Xin couldn't help but ask.
"There are always some memories in people's hearts that are completely indelible." The man sighed, "And the memories of that peaceful era a thousand years ago are the most profound memories in my heart. Even if that memory is only for more than 30 years, it is much deeper than the nearly 1,000 years after the war. I can still clearly remember the way my daughter screamed when she saw the red panda... "
daughter…
"Your daughter later..."
The man smiled bitterly and whispered, "She and my wife died in that disaster. I was the only one chosen to be the survivor."
"… sorry."
"It's okay. I was the one who brought this up first. Oh... I really hope you can succeed..."
There was bitterness in the man's tone, but it seemed... there was no hatred at all.
Yes, anyone who has been enslaved for thousands of years without any resistance would have his hatred wiped out long ago.
Xu Xin could also tell from his tone that he actually didn't believe that Xu Xin and the others could succeed.
But he still hopes that Xu Xin and others can succeed.
“嘤…” Coco seemed to notice that the man was in a low mood and stopped screaming.
Then it stood up and leaned against the window, looking outside, tilting its head: "... 嘤?"
Xu Xin touched Coco's little head and looked out the window at the desolate underground world that was rapidly receding.
Will they... succeed