Berkeley to Yosemite

Michael Portillo's rail voyage continues through northern California, moving east in search of the state's greatest national treasures. To unearth the region's dangers deep underground, Michael visits the seismology department at UC Berkeley and hears the story of the catastrophic 1906 San Francisco earthquake. Experiencing the country's largest multidirectional shaking table in action, he learns how engineers today strive to prepare for the high risk of an earthquake.