Everything is ready, and the ship is about to set sail. Among the three Earth-based variable star spaceships, the Variable Star 3, the one that escaped for Li Zhongyuan, had been destroyed in the blazing molten lava, and now Hai Ge was riding on the Variable Star One, which was the same as Wedel's U Star spacecraft, and Hai Ge was very proud of it.

When the cockpit door slowly closes, all outside sounds are cut off, and the spacecraft suddenly becomes a small world of independence that is about to leave here.

Haige put on ultra-thin goggles, fastened his seat belt, and the AI operating system started the engine.

He was still hoping that the ship would be able to fly over the plant kingdom like a bird when it entered the ground's lift-off passage, knowing that the world ruled by giant plants and beasts was so vast that it seemed to cover the entire core layer, and the ship should be able to see it no matter which way it flew.

But Haige was disappointed, and the Variable Star 1 Earth-based spacecraft rose vertically, with a white air mass with flames spewing out from the bottom vent, exactly forming a ninety-degree angle to the tarmac......

"Farewell, magical underground plant kingdom, you will definitely appear in my dreams in the future, and I will always miss you."

As he parted, Haige said the same thing as Wedel had said when he left.

From the center of the earth to the ground, the total distance is 6,371 kilometers. Even if the Earth-based Variable Star 1 could reach an average speed of 350 kilometers per second, the total duration of the trip would take at least five to six hours, as the buffer time on the way must be taken into account.

Haige imagined the magnificent scenery that he would see during the voyage, and his heart was full of yearning. He saw a rainbow in the front mirror, and now he knew that it was a signal that the light control channel was being built, but this time the channel builder was no longer Wedel, but Professor Li Zhengsong.

He still remembered what he saw in the Shadow Vision, the magnificent cosmic spectacle, countless stars shining brightly, pulling out a long galaxy on the black velvet cosmic background, and spreading out into the unknown deep sky......

The scenery of the earth voyage must not lose space, and the enthusiastic iron-nickel molten slurry is added, maybe the scenery will be more beautiful!

Haige fantasized wishfully, but when he left the core layer and entered the Gutenberg discontinuity, he realized that he was very wrong.

The core of the earth is surrounded by solid iron-nickel metal, and the metallic rock has a dull luster, and it does not have the rich and varied colors of the hedron mine hidden in the underground plant kingdom in the very center. After passing through the transition layer between the inner core and the outer core, Hai Ge thought that it was time for the atmosphere outside the spacecraft to boil, but the light-controlled corridor built by the electromagnetic wave transmitter appeared directly in front of the spacecraft in strict accordance with the coordinates, and the variable star spacecraft "swished" like a small flying ant and drilled into it.

This time, as it was for the spacecraft to pass through, the light-controlled corridor expanded into a tunnel, and the enthusiastic iron-nickel molten slurry that Haige wanted to admire was completely isolated from the corridor, and the Variable Star One replaced his pair of sneakers with magnetic stripes, making regular rotational movements along the widened track. The view from the porthole was spotless, and despite the seven-colored light, it was dull and boring.

The total distance of the outer core of the Earth's core is about 2,080 kilometers, and because it rotates and the speed cannot be fast, it takes the variable star spacecraft an hour and a half to complete. During this time, Hai Ge did not sleep, he watched the rainbow light that flickered in front of him one after another, and kept recalling the shadow journey a few days ago, and the time spent with Wedel.

"Son, you've passed through the hottest molten lot and are about to enter the lower mantle layer from the Gutenberg interface."

The old man's voice came from the intercom on the console, and it was Professor Li Zhengsong.

"Oh~" Hai Ge woke up from his thoughts, and the sound of "child" made him almost jump up, but after a while, he realized that the speaker was the old professor, not Wedel, who was no longer missing.

"Professor Li, this ...... Walked through the light-controlled corridor so quickly? Haige muttered. This voyage took a long time, but it was as fast as a moment in his feelings, he had too many memories to sort out, and he was reluctant to say goodbye to Li Zhengsong.

"Don't be sad, kid, maybe in ten years, we'll meet again, if I'm still alive then."

Li Zhengsong's face appeared on the display screen, and Hai Ge found that after only a few hours of separation, the professor had aged a lot. His gray hair was all white, covering the top of his head like snow. The wrinkles on the forehead have also deepened, folded layer by layer, engraved with the vicissitudes of time. Hai Ge knew that the pain of losing a child was a major blow, and it was also mixed with the torture of conscience, and perhaps he would never be able to get rid of the entanglement of grief.

"Professor Li, you will definitely live a long and healthy life, and we will definitely see you again in ten years!" Hai Ge said sincerely, but he also knew that these words could only be regarded as a blessing.

The rest of the journey is not much more interesting than going through the core layer. Spaceships are often hit by seismic waves, a phenomenon that occurs when they pass through the center of the earth. But no matter how dangerous it is, Variable-1 always manages to deftly avoid the impact and always maintain a smooth flight.

The total length of the mantle section is about 3,000 km, and when it reaches the lower mantle layer, flowing silicate rocks can be seen. The temperature here is not low, and the silicate material is malleable due to the high temperature, so it looks like a flowing liquid.

Perhaps because the passage has been opened for a short time, it is rarely used, so the road is difficult and difficult, and there are rocks in the way from time to time. The protruding stones were probably newly rolled over after the road was opened.

Variable-1 tries to avoid the densely stacked rocks, and if it can't get around, it sticks out a chisel-like tool from the front of the spacecraft to easily break up the boulders blocking the way.

Hai Ge wanted to slap his hands and applaud, this spaceship can not only pass through high-temperature molten slurry, but also has its own barricade removal function, which is amazing!

The mantle layer is made up of dense rock-forming material, and even though Variable-1 is powerful, its traversal speed has been reduced, and by the time the spacecraft's navigation system shows that it is about to reach the asthenosphere of the upper mantle, a full three hours have passed.

The asthenosphere is connected to the earth's crust, and passing through it means getting closer and closer to the ground. At this time, Hai Ge really had a mood of excitement, but it was still mixed with sentimentality. He couldn't tell whether goodbye to the sunlight on the earth's surface should be called homecoming or leaving.

However, the navigator added a note that the asthenosphere is the source of volcanic magma on the ground, and there is no light control corridor to protect it, so the spacecraft must be extra careful when passing through, and do not fall into the cracks in the hot rocks, otherwise if it gets stuck, the consequences will be unimaginable.

It seems that the journey to the center of the earth is not as safe as initially thought, with the possibility of avoiding the lava of the outer core of the earth's core, evading earthquakes, and having to deal with rocks that are ready to devour passing ships with their mouths wide open!