the tunnel through which the city`s sewage flows. dark passage without end

benighted black blackish blackness blackout blue brunette cheerless citys color colored crepuscular dark darkened darkening darkish darkness depressing disconsolate dismal dour drear dreary dusky end evil flows gloomy glowering glum grim inactive incomprehensible light moody morose murky night passage saturnine scene semidarkness sewage shade shadow sour stygian sullen total tunnel twilight twilit unlighted unlit weeknight which wickedness