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The ceiling’s story. Along most of the length of Hezekiah’s tunnel, the ceiling’s height varies between 5.5 and 6.5 feet, and its surface has been hewn smooth by tunnelers cutting away rock to create a useable passage. In some places, however, the ceiling is considerably higher and remains rough and without tool marks. The high, unhewn ceilings in the tunnel can be explained as remnants of a preexisting erosion channel, left by the tunnelers in its natural state.