You would have to acquire firing clay without any elements of metal in it, which many have. When treespiking was in favor, bridge nails were easily detected and removed. The more creative activists created ceramic dowels of specific clay, fired at high temps.Of course, you could get a length of bamboo. these make wickedly sharp knives among native peoples in the tropics. See the bizaar , perverse and esoteric stuff we know here? I have a survival suggestion. Buy a pizza and rethink this on a full stomach. I can never get those cutting wheels to work. Im just tossing my BOB in cargo and hoping our security remains at the present level.<br><br>