 During one of these, Kryten becomes convinced that Lister is a 3000 series android (an unsuccessful model, due to its hyper-realistic appearance), after which he is forced to obey orders from Kryten, a 4000 series.After embarrassingly learning the truth, the crew are eager to find what has been protected so elaborately, flying further in as more of these unreality pockets occur, causing more very strong hallucinations.Everyone is about to give up when Kryten suggests the crew go into Deep Sleep.