“Why the hell didn’t you warn me it was going to rain?” she shouted, scanning the walls with increasing desperation. It was getting harder and harder to see. What was worse, the water had risen almost to her knees. She was still warm and dry (except for her neck), but it was basically impossible to change direction at this point. She could only coast along with the water, pushing with her legs to steer away from wrong turns and boulders. The water wasn’t just rising, it was accelerating. 