Walls closed over the top and they were plunging through darkness. Dug heard water. Was there an underground river here? Then light came and he saw that they had entered a cavern with a hole in the ceiling for a sunbeam. Ahead was a waterfall. The water came from the right side and fell into the center of the cave where it flowed on to the left. The sled bucked like a bronco as it traversed the slush by the river. They could still crash! There was another sign. LEFT. But it was on the right side... read more
