In this video we see a thorough debunking of an entire industry worth of "diviners" who are people claiming to be able to locate objects, metal, water, etc. underground through the use of metal rods and some sort of supernatural power. Watch as James Randi make one of his finest appeals to reason and the skeptical point of view. You'll see all sorts of diviners using all sorts of divining rods in hopes of winning the tests. At that point the JREF challenge was 10,000, today it's 1 million dollars. The video was shot in 1980 in Sydney Australia.