How about a remote-holo system ?
For instance, when repairs are needed in a hazardous environment, the engineers could gather in a holodeck and make the necessary repairs on a holographic representation of the damaged area, while holograms of themselves are reproducing their action in the real area. Should the repair team be unavailable, then the holograms would perform the repairs themselves, with a persona based on the engineers they represent.
"The main difference between Trekkies and Manchester United fans is that Trekkies never trashed a train carriage. So why are the Trekkies the social outcasts?"
Terry Pratchett