The Lovely Bones

My granddaughter convinced me to watch The Lovely Bones the other day.  While one could discuss the implicit theology in the movie, I'm more focused on two questions: 1) How did the serial killer dig a subterranean room in the middle of a barren cornfield at night with a hand shovel and get rid of all the dirt without anyone observing him?  2) How did the serial killer get a safe-a safe that was so heavy he needed help rolling it into a pit--quickly out of his basement into his car without any help?  Suffice it to say if you're thinking about watching this movie to pass the time, just keep on moving.  There's nothing to see here.