For example, in 1991 a total of 36 farm workers had died when their machines hit duds.
The main charge is what goes unstable on you.
We live in the middle of an old Civil War battlefield (the action at the Chattahoochee River between Kennesaw Mt. and the Battle of Atlanta, I guess technically it was part of the Battle of Atlanta) and people do still dig stuff up from time to time. Those of us who were born here know to stop and call Fort McPherson, but a lot of transplants have no idea what they're dealing with.