The passengers in the car were almost seated, when the radio came from the car.

"Ladies and gentlemen, this train is about to depart, please return to your seats, fasten your seat belts, and do not leave your seats easily to avoid injury. The seventh training camp is the terminal station of this train. ”

Xu Fei and the others hurriedly fastened their seat belts, and after a while, there was a "drop" sound in the carriage, and the entire carriage began to move, gradually speeding up. The first time he took this kind of high-speed train, Xu Fei's mood was also a little nervous, his hands tightly grasped the armrest next to the seat, and his body was a little stiff.

The others were not much better than Xu Fei, but they all had more or less excited looks, and only Yu Zhenxing was a little relaxed.

After the train accelerates to a certain speed, it moves at a constant speed, and many people do not feel the presence of speed, so they all breathe a sigh of relief.

Xu Fei's spirit is strong and his senses are sensitive, so he clearly feels that the speed of this train is very fast, estimated to be about five or six hundred kilometers per hour. It's just that it's pitch black outside the window, and you can only see your face through the glass, and there is no reference, so the speed of five or six hundred kilometers is just Xu Fei's own guess.

"It's really fast, the same as what I saw on TV before."

After more than ten minutes, Xu Fei gradually relaxed, and at this time, the window suddenly brightened.

Xu Fei turned his head to look out the window, both sides were blocked by tall and dense trees, these trees had a tall canopy, blocking the sunlight, and retreated quickly, the train passed through it, like a snake passing through the dark forest, it seemed very small.

After a moment, the eyes were brighter, and the outside world was a little more empty than before. In the distance, I saw tall vegetation everywhere, colorful, converging into a dense jungle. The jungle was filled with a variety of creatures, and unlike the creatures of more than a hundred years ago, these tall vegetation and some animals were modified by energy particles and were huge.

Xu Fei's eyesight was excellent, and he saw a red-haired monkey with spikes on its back and two people tall squatting on the canopy of a tree in the distance, watching the train, and even saw the eyes as red as copper bells, but they were full of violent breath, without the slightest sense at all. Xu Fei believed that if a one-on-one encounter, no one in the entire carriage would be able to escape from its hands.

"Out of Rongcheng?" The air was filled with violent energy particles, and strangely shaped creatures made Xu Fei couldn't help but speak.

"Hmm. You see, those tall vegetation have been transformed by energy particles and adapted to the outside environment, so there are no such plants in Rongcheng at all. Zhang also said in a familiar way.

Li Yi also looked outside, and even Yu Zhenxing, who was originally going to be "quietly", showed a curious gaze.

"Look, what's that?"

An exclamation drew the eyes of all the students in the carriage.

A flock of birds flew in the sky in the distance, covering the sky like black clouds, moving rapidly. Each wings are half a meter wide, very flexible, and behind them, five or six wings have three or four meters of red and black big birds chasing them, extremely fast, claws like hooks, flashing purple and black luster, pounce into the flock of birds, under the claws, only the wailing of birds, and then pierced by the claws, the dead can no longer die. As soon as the bird died, the claws would be released, and then the big black and red birds continued to chase after them, and in a blink of an eye, they killed many birds.

Zhang also looked at the black and oppressive birds in the distance and said: "These birds are mutated sparrows, because of the mutation, the individual strength is very strong, and a large dog can be hoisted with two claws." And the big bird behind them is a variant of the hawk class called the Red Hawk. This kind of monster already has a level, it belongs to the 'red' level monster, and it is generally possible to kill them with a five-fold martial artist with an alloy knife. ”

Xu Fei knew that humans graded the level of monsters according to the rainbow spectrum, which were red, orange, yellow, green, blue, and purple, with the "red" level monster being the lowest, and the "purple" level being the highest. But at present, there are no purple-level monsters found in the world, but there are several blue-level monsters, all of which are fierce and monstrous, and perhaps only the titled powerhouses among humans can match them.

The "Three-Eyed Bluestone Dragon" that broke through the protective shield of Rongcheng at the beginning was only a blue-level monster, one level lower than the blue level, but even so, the "Wild", one of the four powerhouses in Huaxia, could only repel it, but could not kill it.

As for the Gathering Realm, it is the initial realm of the Four Realms of Martial Artists. The four realms of martial arts are cohesion, huiyuan, three seas and supernatural powers. Each realm is divided into nine realms, and the gap between each realm is also very large, and it is said that those titled powerhouses are masters of the Divine Power Realm.

"Since the mutated sparrow is so powerful, isn't it good to collectively besiege that red eagle?" Someone looked at the flock of birds that were quickly dodging and couldn't help but whisper.

Zhang Ye couldn't help but smile after hearing this: "The feathers on the Red Eagle are very hard, comparable to steel, even if those mutated sparrows can have the strength to catch large dogs, they can't break through the Red Eagle's defenses, and they are useless, do you say that a thousand ordinary sparrows can defeat an elephant?" Moreover, as the bottom of the external biological chain, they are gathered together, which is also their way of survival. ”

Some people didn't understand, but Xu Fei and Yu Zhenxing both showed sudden expressions. When a flock of birds gathers, it doesn't matter if they encounter natural enemies, because there are so many races, in the process of chasing, the priority will only be those who have weak wings, the old, weak, sick and disabled, and the young and strong ones will take on the responsibility of continuing the group.

Weaker races perpetuate their communities at the expense of their own kind, and this is how they survive in nature.

Li Yi looked at the chase in the distance, and said with some worry: "Will those red-level monsters attack our train?" ”

Zhang also smiled: "Don't worry, our train is made of underground black copper as the skeleton, the glass is forged from crystal sand, and there is a miniaturized energy shield, not to mention the small red-level monsters, even if you encounter a yellow-level monster, you can easily escape." ”

"Underground." Xu Fei's expression was a little complicated.

More than 100 years ago, the United Nations formulated two plans, one is to explore outward and the other to explore inward.

Exploring the world is nothing more than launching probes, launching giant space stations, and exploring the planets and moons of the solar system in addition to the Earth. And to explore inward is to explore the earth itself.

The diameter of the earth is more than 12,000 kilometers, and the ground on which humans live and the depth they touch are insignificant compared to the diameter of the earth.

And what does the world look like underneath? Nobody knows.

After decades of exploration after the plan was formulated, people finally drilled to a depth of about 30 kilometers underground, and at that time, people found a layer of high-purity, high-energy, and high-stability energy crystals that almost enveloped the entire earth's underground, known as balite.

After research, only a palm-sized bastile can supply a hundred households with energy for a year, and this bastile is a reusable ore, and the energy inside it will slowly recover when the energy is used up and placed under the sun, but this time is very long, I am afraid it will take hundreds of years.

At that time, the human world was excited, and wasn't this the clean energy that it was looking for? And the energy inside it is extremely pure, the energy level is extremely high, and the stability is extremely high, with which there is no need to even develop controlled nuclear fusion. So at that time, the entire human society began to mine baspar on a large scale.

But that's when the change happened.