Water Under Pressure

Huell looks at two historic examples of water under pressure: first at the Malakoff Diggins State Park in the Sierra foothills, where for decades miners used tremendous water cannons to help dissolve mountains in search of precious metals. Today Huell visits a vast man-made valley that remains a testament to the power of this process. Next, Huell visits California's Old Faithful Geyser in Calistoga — one of only three in the world.