Human: Write a short description of a gloomy scene inside a tunnel sewer with a splintered door. Assistant: 
A splintered door drifts above a sea of filth, a make-shift bridge for rats scurrying about the tunnel. The rotting wood gingerly floats on the water, dancing slowly in the currents. Drops of something dark and dank fall from the uneven ceiling stones, splashing as they strike the water and vanish into the murk.