My $.02,
My dad was plumber, used dowsing to find underground pipes, never failed.
I was a science teacher for 34 years, don't believe in much mystical stuff.
However, when I was about 14, he had to find the leach field at a local school.
We flushed a whole bunch of toilets, got water flowing in the field and he dowsed out the lines with amazing accuracy. Brass pipe handles, bent brazing rods held horizontally. Cross a pipe line and the rods would cross.
He taught me how to dowse lines where there was flowing water. I don't understand how or why, but it does work for me.

I've done it many times to locate water lines and septic lines, can't do power lines.
Don't understand it, can't explain it, confuses the heck out of me, but it's hard to argue with success.
Bill