So, they know for a fact that the prisoners are escaping to kidnap humans, but even knowing about the existence of the "underground channels," there's no security outside the Dust Box??
It sounds more like nobody really cares if they escape.
'Cause, like, it's a massive box in the middle of nowhere. If the exit the 'flies' take to go outside is literally an underground channel of caves, I will
fly through my window in laughter!
The story is getting better and better. Thank you so much for the translation.