The internal structure of the Kyushu Black Prison is similar to the underground base built by the Umbrella Corporation in the Resident Evil movie; it's a three-dimensional hive layout...
All the land vehicles entered through the first gate and arrived at this Central Plaza.
Those land vehicles transporting male prisoners all followed the central elevator shaft of the plaza to the next level.
Obviously, the male section is below, while the ground level of the mountain's interior is the female section.
Among this group of nearly ten thousand prisoners, there were only about a thousand female offenders, the vast majority were male, meaning there weren't many land vehicles left on this level.
The nine sections of the women's prison are built around the Central Plaza on the ground level.
Each land vehicle is automatically driven, and once the central elevator shaft of the plaza is closed, they head towards the nine surrounding passageway gates.