Of course, you must try to drive them, first at a 90º angle, then up to a 45º and hit bedrock...
When I throw them into a trench, I first find a good solid limestone rock embedded in the soil and tap the rod into it at a 90, declare "Oh, I've hit stone" then tap it at a 45 and declare, "Gosh, I've hit stone again" and then I chuck it into the trench...
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