Human: Write a detailed description of a dreary sewer scene with a stream, a tunnel, a shaft, and stone handholds. Assistant: 
A stream of refuse flows through a rough channel cut into the floor, reeking of sewage and things better left unexplored. A rough-hewn shaft in the ceiling rises toward the surface, spotted with slippery but useable stone handholds. The tunnel continues into the distance to the northwest and slopes upwards slightly to the south.