Yesterday there was a show called "Broken Wings" about avaition archaeology on the History Channel. There was a section about the search for a P-51 Mustang that might have crashed into Santa Monica Bay during World War II. They showed one of the searchers walking along the shore using a sophisticated instrument to try to locate the wreckage.
Dowsing rods. Really.
They didn't find the airplane. It might not have been where they were looking, but still... I had a tough time watching after that.