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Dude! You need to find what the sheetrock is hanging on. Usually it is a metal piece called "Z" channel. I have seen it installed both vertically and horizontally. I would guess horizontally, every 16" on center. Use a stud finder or use a thin finish nail to probe. You will hit metal within 14.5" of wherever you start (unless it is 2' on center). Z channel is similar to metal studs. It is fastened to the concrete with powder actuated tools and the sheetrock is simply hung on it with regular sheetrock screws. You can use sheetrock screws to mount to it but a heavier, thicker self tapping sheetmetal screw would be stronger. These are the kind with the end that looks like a drill bit and hex head. If you need to hang something on sheetrodk that is heavy then use large toggle bolts and/or a wooden ledger piece that is glued on with maxbond/liquid nails type adhesive.
Believe me, the sheetrock isn't suspended in mid-air by magic. It is hung on metal elements that are attached to the concrete...
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