Is a Betsy Gun a practical tool for locating caves and other karst...
 

...features beneath the surface? I have been ridge walking my local outcrop surveying all of the caves and karst features. Often I encounter a sinkhole which is unaccessible to a human, I would like to get an idea of what the subsurface looks like so i know if i should spend to time and effort into digging out the boulders to open the cave. If not a Besty Gun, does anyone have any other suggestions?