I have found entering using this sewer access to be visually disorienting due to seeing a mix of both upper and lower level visuals.
Exiting creates a series of 'slices' of texture maps until partially up rock wall. There has been at least one time I needed to use /unstick to get back to a point where I could attemt to exit again, and one time where I slipped out of the world and was sent back to my spawn point in Ojaveda.
Is this a know bug? If not where do I report it?