You feel the ground begin to slope beneath your feet as you walk on and on in the dark, feeling your way along the walls. The air gets wet and soon you have to feel along with your feet because there's slime on the walls and you find that very icky.
Suddenly, the ground pitches without warning and you find yourself on your back, sliding down a slimy slope through the dark, faster and faster as the slope gets steeper and steeper. Up above you begin to see a red light.
You hit gravel, which is very much less slippery, and you find yourself rolling and flipping head over heels until you lose consciousness.
When you wake up, you find yourself...