I, too, live in Arkansas...I've heard of this subterranean race before (another website calls them the "Moon-Eyes", bc their eyes seem to wrap
around their heads). Subsequently, I printed side-by-side aeromagnetic and county maps...showing where the highest peaks in electromagntism are
located. I've gone back and put little stars over the (approximate) location of Cushman...but remember the actual entrace-cave is supposed to be
somewhere around the W/NW of that.
Depending on if and how the tunnels double back to the south or the southwest, that put these underground cities right there in the middle of some of
the highest electromagnetic fields in whole state of AR! Food for thought, I suppose
**You can U2U me if you want a copy of the maps I put together!