Now, most serious. Some years ago I built a nanovoltmeter attached to a short antenna. This has in output an audio generator. I was surprised that detects changes in sites with natural (type tubular) holes. I suspect that the air compressed in it has a small voltage, maybe also causes false alarms in metal detector, is a kind of halo, very well detectable by regular MD, but you NEVER will find the target. Another extrange think detectable by this nanovoltmeter is bamboo roots!
Many years ago we found a small treasure in a silver container. Over the treasure there was a stone. When we up the stone, the compressed gas, yes THE GAS, when out with sound sssshhhh!!!
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