TWO-BOX CAVE DETECTION?

[CDMakaKvM]

Has anyone out there ever discovered a cave or tunnel, not knowing it's location beforehand, with a two-box detector? I know the TM-808 and TF-900 have a cave setting, but I don't know how it detects a cave. Anyone have experience in cave location with a two-box?

 

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[konnon6]

I haven't found anything that works and ground pen radar is to exspensive and not that portable.It sounds funny but a piute Indian
I met, somehow could here the eckco of the walls of a canyon.And tell
were the cave was.I tryed to here the difference but never lerned.

 

[OutBack Duo]

I would also be interested in finding a way to discover unknown caves. I have property in Central Missouri and there are known caves on other property all around me so I know there has to be some under my 10 acres. Let me know what you find out.

Don