Red Dwarf Season 7 Episode 4

Duct Soup

Kochanski is not adjusting very well to being on Starbug and Lister tries to make her feel better by building her a makeshift bathtub and finding some extra clothing for her. Kryten thinks that this means they are growing closer and soon will not need him so he 'accidentally' causes an engine failure, forcing the crew to crawl around in the air ducts to get to the engine room.