This area, covering over fifty thousand mu, doesn't only consist of residential buildings.
To be precise, it's a large integrated area combining residential, medical, commercial, arts and culture, business offices, and intelligent living services.
Naturally, it's called the Habitable City.
According to the information Lv Bai found online, the permanent population of Habitable City is about ten million, and there are more than fifteen such Habitable Cities in this shelter.
One can only imagine the sheer scale of Shelter Number 9.
Of course, Shelter Number 9 was not this large when it was initially built.
Over sixty percent of the area is the result of gradual expansion over several centuries.
Yet, it's still astonishing enough.
Roughly comparing, it's like digging out half of Hong Kong underground, the manpower and resources expended were astronomical.
As Lv Bai pondered these miscellaneous thoughts in his mind, he unknowingly arrived at the entrance of a fried chicken shop.
