If you are stuck in the area with a small square metal door and a tilted hall, walk up to the wide pole and press select. Then press square.
If nothing happens the press x. You will then go into the spirit world.
You have to fight somebody. Then climb or jump up the wall. Then change it back to the physical world.
We have more cheats and tips for this game here, Legacy of Kain: Soul Reaver cheats
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