While rafting on the American River, Rasheed, Kohner, Scotty and JB measure the river grade, water flow and study the flow patterns around eddies, holes and tongues. Underwater geologist Carol Reiss’ research helps scientists better understand earthquakes. She has studied the ocean floor firsthand in the submersible, the Turtle.

Originally released by Big Media Holdings LLC, 2013. Streaming video file encoded with permission for digital streaming by Infobase on February 10, 2017.

Wicked Waters (5:56); --Planning for Rapids (6:47); -- Satan's Cesspool (5:57); -- Riddle Answer (0:54); -- Credits: Pendulums: Dragon Fly TV (0:40); .