What are routes of Andy Dufresne's escape in The Shawshank Redemption? I know that the last one is the sewer, but how does he get to the sewer?
The film's script indicates that the shaft is a partition. It contains electrical wiring and various plumbing stuff. Note that it really shouldn't be there (the Warden and staff don't know about it) but that's cheap construction for you.
INT -- VERTICAL SHAFT -- DAY (1966) 224
Dark as midnight. Concrete walls rise on both sides. If you imagine them as two huge slices of bread, the meat of this particular sandwich is about three feet of airspace and a dark tangle of pipes between the cellblocks. Rory's appears, shining his flashlight down the shaft. Somewhere, a rat SQUEAKS.
RED: (V.O.) It was his third day on the job.
RORY: Warden? There's a space here between the walls 'bout three feet across! Smells pretty damn bad!
At the bottom of the shaft is the sewer main that he then escapes through...
Andy finally gets his head through, scraping his ears. He's got a penlight clenched in his teeth. He peers down into the shaft. At the very bottom, maybe 20 feet down, a big ceramic pipe runs the length of the cellblock. Beneath its coat of grime and dust, the word "SEWER" is stenciled.