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Re: IS THERE A DEVICE FOR LOCATING HIDDEN TUNNELS ? August 17, 1998 at 18:25:23 In Reply to: IS THERE A DEVICE FOR LOCATING HIDDEN TUNNELS ? posted by gerardo on August 17, 1998 at 07:18:54 Gerardo, your cheapest way to go is with resistivity. You can purchase a used voltohmeter from your power company, and they will tell you how to hook it up to copper rods strung with wire. The resistivity is measured on the meter and caverns will show up. The next best is ground penetrating radar. There are places on the web to lease them that is not too expensive. Bill
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