Large for a turbolift shaft but I suppose its possible. I certainly hope it's out of service though, there's a gantry running across the middle!The Viceroy boarded at the bottom of the ship, Riker and Worf were at the top. They met in the middle, deck 9, and the fight ended in an out-of-service turboshaft running parallel to the working one.
http://movies.trekcore.com/gallery/albums/nemesishd/nemesishd2227.jpg
http://movies.trekcore.com/gallery/albums/nemesishd/nemesishd2244.jpg
Maybe it was where the spare warp core would have gone? Delivery was going to be Tuesday, before they got called away to Romulus
