That power of the jd just crumbled the rock 

 imagine what a cat would have done 

 haha!!  So those piles are gettin screened then? That should keep ya busy for a bit. I would say it will take you years to dig a tunnel with Rc but you've done it in a few months!!  Pretty big job you did and now on tail end of it. Pretty impressive Joe!!  I hear ya about the knees, we arnt getting old, just starting to show signs of use!!  Wearing the paint off

. I showed the wife your tunnel project, our new house basement is about 50' from future garage. How nice it would be to undertake that!!  You are a bad man for planting that seed!!!  Now Im thinking of a nice 6' wide, thick reinforced walkway out to garage, possible future tunnel ceiling!!  Hope ya start getting some warm weather. Anything seeded yet?