There is a new piece of machinery on my land. It's very large and has a punch/saw piece with diamond blades (see top picture). Imagine how much that cost! Anyway, you can't dig holes where there is no dirt. We truly are on solid rock. That machine has to come in here and hammer, hammer, hammer at the shelf of rock, breaking it up into smaller pieces that another piece of machinery hauls off. We're collecting quite a rock pile. The pool builder is planning on using that for landscape, and fill. Although my pool builder lives out here, he said that he's never seen rock this hard. I'm guessing that's not a good thing in terms of completion time!