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May 7, 2016 at 2:20 comment added Blackbeagle Star drill (chisel) and a heavy rock hammer could be used to create the holes.
May 6, 2016 at 20:46 comment added Johnny Still a good answer since the asker may have been thinking more along the lines of a jackhammer than a drill. In any case, this answer may be useful to others who have never heard of such a product.
May 6, 2016 at 20:42 comment added Ben Welborn without power tools (like a drill)
May 6, 2016 at 19:17 history answered mustaccio CC BY-SA 3.0