I've just discovered "your chance to live: Earthwatch 1972" whilst having a good scout around the Prelinger video archive which contains many public domain movies. Its got some brilliant footage for intercessions etc. (tsunamis, earthquakes, forest fires etc). This particular footage needs a good edit however before it is actually used in a service! The really good stuff starts at least halfway through so be patient.
http://www.archive.org/details/YourChan1972
