OK, I'll expand a little on this. I grew up in a small community between Mansfield and Midlothian Texas called Britton. In this community lived an old gentleman named Herman Cope. His Father, who went by the name "Boss" Cope, had often told a tale of some outlaw loot purported to be buried in a "cave" somewhere between Britton and Cedar Hill, an area now largely occupied by Joe Poole Lake, but not entirely. I know of no more details than this, other than I have heard my own Father and Uncle discussing this several times while I was growing up. They never made any attempt to locate it, and in all the time I ran around in the hills in that area, never ran across anything resembling a "cave". But, in my teenage years, we seemed to have a reasonably large number of Bats flying around Britton around sunset. Where did they come from? I have no idea, but small sinkholes were known to appear, one even on our property, now and then that, no matter how much soil you put into them, they could not be filled up. This lead me to believe that, possibly, a cave might exist somewhere beneath the area of Britton and Joe Poole Lake. Maybe not, but it does lend a small amount of credence to Boss Cope's story.