 Any other time, though, Lister is shown in closed spaces, without any fear.When the Cat questions Lister as to why he's never shown any signs of claustrophobia in other instances when they've been trapped in small places, Lister responds he only 'sometimes' suffers with it, thereby avoiding a continuity error.It is also alluded to in a deleted scene for "Krytie TV" wherein Lister is sneaking through a duct to get to Warden Ackerman's quarters.