St Francis Dam Disaster - Debris 

A neat digital re-creation of the dam after collapse: • St. Francis Dam - The ...
I visited this after only 7 hours of sleep in the prior 72 hours, so my narration is poor. Also, I didn't really get a good bunch of video segments. In fact, I don't even have a shot where I introduce the subject. Oh well.
Google St Francis Dam disaster if you have an hour to spare.