Looking at the Marvel comic adaptation, it isn't even clear where they are. Maybe the illustrators didn't know either. lol.
"It's a trap!"
Again a blast shield thunders down, cutting Luke off from those he hopes to save...
Corridor by corridor, it continues...separating him even from artoo-detoo! Until at last there is only ONE PATH, leading to the carbon-freezing chamber...
and what Luke now realizes was inevitable.
Not that this means anything, just interesting.