There are things in Witchspace. I've seen a ghostly face that exited with me and shot across the "Real" space like Stars do sometimes. Others have seen them too.
I've also seen several different kinds of blobs flying in formation that look like traditional 1950's UFO.
Perhaps one day we might find out what they are but I doubt it will be soon.
I took these two paragraphs from the Dark Wheel.
'every few thousand parsecs along the Witch-Space tunnel there are monitoring satellites, and branch lines, and stop points, and rescue stations; and passing by all of these are perhaps a hundred channels, a hundred
'lines' for ships to travel, each one protected against the two big dangers of hyperspace travel: atomic reorganisation, and time displacement.'
'They say that Witch-Space is haunted. Maybe that's why they call it 'witch'. Time turns all around, and atoms turn inside out, and gravity waves billow up, and things move there, lifeforms, or shadows, or atoms, or galaxies, who knows? No-one has ever stopped and gone outside to find out. Only robot remotes exist there, switching stations, monitors, rescue Droids and the like. Whatever lives in Witch-Space, in the
Faraway tunnels, will remain a mystery always.
But there are ghosts there. The ghosts of the early ships that went in to Faraway, and didn't come out again.
Ghosts . . .'