Underjordens hemlighet
- Annu: 1991
- Paese: Sweden
- Genre: Family, Comedy, Drama
- Studio: Sandrews, FilmTeknik, Cinetofon, Svenska Filminstitutet, SVT
- Parolla chjave: hospital setting
- Direttore: Clas Lindberg
- Cast: Max Vitali, Oliver Loftéen, Gösta Ekman, Kristina Törnqvist, Gunnel Fred, Hans Wigren