The Zhang Family was wealthy and powerful. Their massive bunker was private property, and outsiders had no right to enter.
Although it connected to the underground public transit tunnels, anyone exiting there faced strict inspections.
Yang Bo had known this long ago, because the information Zhang Bozhen had given him mentioned it.
These bunkers were among the earliest extraterrestrial bases, and they had not been built in the mountains.
At the time, the entire planet had still been barren, and flat ground was more suitable for construction.
After the planet's transformation was complete, these extraterrestrial bases lost their original purpose and were sold off at extremely low prices.
The prices had been absurdly cheap, because demolishing an entire extraterrestrial base would have cost even more.
Tianze Star had strict environmental regulations, mainly because it was one of only two Habitable Planets in the Capital Circle.
March Star was also habitable, but because of its location, neither its land prices nor its environmental regulations were as strict as Tianze Star's.
The Zhang Family's bunker was located in a basin called the Kasna Basin, so it was also known as the Kasna Bunker.
It had been named after Kasna, the first person to land in that basin.
Bunker was actually an inaccurate term. The living conditions in the earliest extraterrestrial bases had been poor, so people mockingly called them bunkers.
Building an extraterrestrial base on the surface would affect later planetary transformation. It would also consume far more energy to withstand cosmic radiation and temperature changes, whereas building underground saved a great deal of energy.
Thus, Kasna Bunker Station in the public tunnel was guarded by the Zhang Family's private security.
Without the Zhang Family's permission, no one was allowed to enter the private grounds.
Only a very small number of Zhang