If I had not seen the aftermath of this with my own eyes, I would not believe it ! I met a friend of a friend who was splitting wood with a steel wedge. It was old and well used, so the head was quite mushroomed over. He has also using a hand held hammer/sledge. After some splitting, a shard of steel flew off and embedded itself it AN ARTERY in his arm ! He had a fountain a blood spurting out of his arm with every heart beat !! A couple of towels, lots of pressure and a fast ride to the hospital (some one else driving) saved his life. The aftermath was not pretty. A long scar on his arm where the "harvested" a vein to fix the severed artery.