Absolutely fantastic. When I got to  "The Machine" I was sold. There's a good amount of tension here and a wonderful layer of horror to the whole thing. My only critique is that the ending sort of sneaks up on you, but there are some good suggestions to have this lead into another dungeon, so I can give it a pass. Whether your group has a twisted sense of humour, or is looking for something to freak them out, this is well worth a look.