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Continue to ChatWith a different form of wireless instrument devised by me some years ago it was found practicable to locate a body of metallic ore below the ground, and it seems that a submarine could be similarly detected. - Nikola Tesla from https://whatsmyquote.com/quote/with-a-different-form-of-wireless-instrument-devised-by-me-some-years-ago-it-was-found-practicable-to-locate-a