I stand corrected, I pulled up my house plans (I was sure there was steel mesh in the floor), there is NO steel mesh in the floor, minimum floor thickness is 4 inches, 3000PSI concrete, and apparently just some additional attachments for load bearing interior walls.
So to the OP, go ahead and drill away for your safe.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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