Corrected entry: Surely the poster hiding the tunnel would not have stayed flat on the wall of Andy's cell due to air flowing through the tunnel. Would it not bubble and be noticeable?
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Correction: Do you mean before, or after he escaped. If you mean before, he could have covered the other end with something, to prevent this. If it was after, do we know if air was always blowing through there, maybe it would have eventually, but not during the brief time everyone was in the cell.
pross79