I was recently in Wimberly, Tx (central TX) and noticed a property listing for an area know as Blue Hole. I have previously heard of this area but did not know if it is diveable. The owners listed approx. 15 acres along a river (Blanco?) where a waterfall empties into a swimming hole. The listing stated that the "Blue Hole swimming area is 38 ft deep, spring fed and contains an underwater cavern". The area is near San Marcos. Has anyone heard of this Blue Hole before? Is this cavern diveable? I have heard stories of swimmers diving into an air pocket in a cavern in this general area before, but that's about it.