I stopped drilling and yanked my earplugs out just in time to hear the most terrible scream I have ever heard trail off and echo into the darkness of the cavern. It took me several full seconds to comprehend that this was coming from inside the hole, and not the bit. It would frequently complain by screeching and whining as we forced it into the wall. At first I thought it was just the drill bit doing its job on the cave. I could hear it over the noise of the drill, even though I had the ear plugs in. Suddenly, over the squeal of the drill wearing down the rock, I heard a strange noise. I had my ear plugs in, my safety glasses on, and was lost in my own thoughts. I was kneeling down and working the drill slowly into the wall at the time.
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