It didn't take long for the aircraft to fly over the air-ground integrated vertical rail transit center.

The transportation center used to travel between the ground and the spaceport is a huge octagonal pyramid-shaped building. It covers an area of 25 square kilometers and has a building height of 6 kilometers. The top of the pyramid is connected to the spaceport by a closed cylindrical orbit with a diameter of 500 meters and a length of 30,060 kilometers.

After circling the pyramid, the aircraft slowly landed, and finally stopped at a "parking stand" on the third floor of a three-dimensional parking plaza in front of the pyramid. As far as the eye can see, this square is also a huge building, with a cubic shape, a height of more than 1,000 meters, divided into ten floors, each with an area of dozens of square kilometers. Countless aircraft take off or land in the space of various floors of the square, which is very busy.

Once the Sky Express was parked, the circular platform in the center of the bottom of the vehicle opened and slowly lowered to a height of 10 centimeters above the ground. Lucy and her family descended from the platform, walked into the nearest sightseeing elevator, and descended to the basement level of the plaza.

The basement level of the plaza is connected to the vertical rail center, and the waiting hall is also located here. Today is the deadline for the first 200,000 citizens to emigrate to the Centaur constellation, and while most of the migrants have arrived at Earth's One spaceport and boarded the starship, there are still a handful of people who need to board the ship within a day today, so the waiting hall is still bustling. In front of the immigration-only entrance, there was a long queue of immigrants waiting for security checks.

Lucy's family came first to the large circular light curtain in the center of the hall. Dad Owen faced the light curtain, and a 20x20 square centimeter subtitle message immediately appeared on the light curtain. This information includes the passenger's identity, platform entrance, and related directions.

After that, they followed the flow of people to an arched metal door, which is a non-immigrant security lane. Lucy and the others walked through the metal door one after another, and the green light came on, and they passed!

Thinking that she would be able to see her grandfather soon, Lucy was both excited and anxious, pulling her parents to trot briskly. After a while, they came to a "wall" in the center of the pyramid. Lucy looked above and on both sides of the "wall", but there was no end in sight, and people were walking on the "wall".

The moment Lucy stepped onto the "wall", the direction of her body's gravity immediately changed under the action of the artificial gravity field. The direction of gravity of the body has been rotated 90 degrees perpendicular to the ground, and it has become heavier than the "wall", which means that the "wall" has become the new ground.

This "wall" is the central platform. The central platform is cylindrical in shape, located in the center of the pyramid and perpendicular to the base of the pyramid, but the central platform is so large that it looks like flat ground as far as the human eye can see. In the middle of the cylinder of the central platform, there are hundreds of sub-platform entrances in circumferential order. The entrances of each sub-platform are connected to the sub-platforms by radial passages. Each sub-platform is also a semi-cylinder with a relatively small diameter surrounding the central platform cylinder. Trains are parked in the various sub-stations.

Lucy turned to her dad and asked, "Shall we get to platform 30?" Owen nodded. At this time, a small airship on the platform used to pick up tourists was heading towards Lucy and the others, and Lucy hurriedly signaled for them to stop. Lucy's family got on the airship and said to the front desk of the unmanned aerial vehicle: "Platform 30", and the airship carried them away.