Red Dwarf: Season 7, Episode 4 - ProjectFreeTV

7 - 4: Duct Soup

When the generator and its back-up go down in the middle of the night, the crew have to crawl through the mile long labyrinth of service ducts to restart their engines. On their journey they discover a few surprising things about one another. Including what Lister once did on top of a crate of canned asparagus.