Underjordens hemlighet
- Taon: 1991
- Bansa: Sweden
- Genre: Family, Comedy, Drama
- Studio: Sandrews, FilmTeknik, Cinetofon, Svenska Filminstitutet, SVT
- Keyword: hospital setting
- Direktor: Clas Lindberg
- Cast: Max Vitali, Oliver Loftéen, Gösta Ekman, Kristina Törnqvist, Gunnel Fred, Hans Wigren
