The Dark Prison was built upon the Lonely Mountain, surrounded by cliffs and an abyss.
No criminal can escape from within.
Even in the boundless sky, for a radius of one hundred square kilometers centered on the Dark Prison, anti-aircraft guns of the prison are locked on, and any unauthorized human appearance here will be met with a barrage.
The power to destroy a spaceship in an instant is sufficient to ensure the safety of the skies.
Thus, since its establishment, there has not been a single successful escape; this is the world's safest prison, and entering here symbolizes an end.
And those detained here, even the most ordinary person, are all serious offenders.
Every crime they committed is deserving of death, but with the abolishment of the death penalty today, they are sentenced to life imprisonment for at least a thousand years.
As of now, within this prison, there are altogether three hundred and sixty-two prisoners.
