Crawling in Parisian filth

I know nothing about Darkpass except that it's a soloable dungeon crawler set in the nineteenth century Parisan sewers!

Knowing the French reputation for filthiness, I really wouldn't want to venture there...

On the other hand, since we are supposed to never wash ourselves, maybe the sewers are cleaner than in other cities, who knows. Which might explain while butchers are wandering there - it's a clean place to store one's meat?