Read recently (Torygraph,Grauniad?) about experiments done in the Royal Albert Hall with musicians playing instruments which produce infrasound ie. wavelengths below 50Htz. Many listners reported unusual sensations/feelings/emotions. The article suggested that perhaps this is why some people have mystical experiences in churches when the organ is playing extremely low notes.
More pertinent to our point, perhaps underground water produces a low frequency "rumble" which is picked up and magnified by the nerves/muscles and shown by the movement of the dowsing rods>
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