My wife was a nurses aide in her early years... she took care of two paraplegics that hit things in the Pueblo Res. It's always spooked me a bit (because prior to that, I was a jumping fool).I had a friend up in Minnesota who was cliff diving and hit something in the water. He ended up being a paraplegic. They don't know if it was a turtle, a fish or a board. The water was plenty deep. Pretty sad.