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I work with telecom maintenance, have had some older colleagues who used dowsing rods to locate cables. It's complete bollox but if you question them they get really defensive so was easier to just humour them (and double check with the proper tool). It wouldn't surprise me if it's the same thing here.
Thames Water still using dowsing rods
https://www.standard.co.uk/news/london/thames-water-dowsing-rods-leaks-divining-b1056598.html