The escalator began bringing you down, and down, and down... Holy fuck, how far does this go?? Finally you can see the bottom, a small stone platform above a sheer drop. You approach the edge and kick a pebble. *click, click, clack, SPLASH!* Oh...What is this? an underground river??
Just as you are about to turn around and go back up the escalator, the walls and floor begin to shake and the whole platform you are standing on collapses. You are fine, but now you're stuck down here. You see a sketchy looking wooden bridge that spans the darkest scariest looking part of this wet hole.