The moment I read that, the image of the generic conveyor belt gauntlet came to mind. A tight passage with pistons, moving blocks, crushing down from above or pushing you from the side. It could run behind the walls for a good claustrophobic feel, or alternately it could go across a bigger open area of the factory, above some sort of hazardous area, or simply a drop (HL1 had a lot of this stuff after the garbage crusher bit).
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