human
Produce a detailed written description of a gloomy scene inside a tunnel sewer with a pipe, water, and a grate.
assistant
A fitful light filters through the bars of the grate overhead, and the air is unpleasant with odors probably best not identified. The walls and floor of the cramped space are built out of tightly fitted stone. A thin sheet of water flows southward down its center into a large pipe, just big enough to squeeze into.