human
Please generate for a dreary scene inside a tunnel with a waterfall and a cataract.
assistant
The tunnel floor takes a sharp downturn as it winds northward and the roar of a waterfall makes any further movement in that direction unlikely. By the hollow sound of its echo, the cataract is a precipitous drop. Perhaps in the light of day such falls would be lovely, but the endless blackness ensures that none will ever admire its beauty.