The March 11, 2011 earthquake was the world's fourth largest earthquake since record keeping began in 1900 and the worst ever to shake Japan. The subsequent tsunami that slammed Japan's coast with 30-foot-high waves traveled six miles inland, obliterating entire towns in a matter of minutes. This program features gripping stories from tsunami survivors, compelling day-to-day reportage, and in-depth science perspective. It also explores the risk of a comparable disaster on the U.S. west coast.