Dirty
A tsunami hit not one, but TWO prisons, making them extremely dirty.
Imagine observing the two prisons being hit by a giant wave of muddy water, making them completely dirty. How disgusting!
お
よご, きたな, けが
None
What's the most dirty are the prisons' obi (お) collections. You can hear the prisoners crying, "Oh, not the obi. Our obi are all dirty, oh no!"
The obi were the only nice thing the prisoners had left, and now they're all dirty. Even as you leave the prisons, you can still hear their echoing cries of "Oh, not our obi!"