The White Hole can be revisited at any time after the quest by using the Scan option of the Gower Quest disk of returning while stood in a bank area, or at the original entry point in the south-west of the Dwarven Mine (near Boot). Scanning with the disk again while in the White Hole returns you to the Dwarven Mine, regardless of where you entered from. Logging out in the White Hole returns you to where you entered from. Other teleportation methods cannot be used in the white hole. Talking with Thordur during and after the quest gives the option to teleport on to Behind the Scenes.