Vernon SewellDirector
Gordon WellesleyDirector
Ralph RichardsonJaap van Leyden
Googie WithersHelène van Leyden
Esmond KnightVon Schiffer
Beresford EganKrampf
Frederick BurtwellCaptain Müller
Kathleen ByronSchoolmistress
Willem AkkermanWillem van Leyden
Dorothy GordonJanni Peters
Charles VictorBastiaan Peters
John LongdenJost Meertens
Joss AmblerCornelis Smit
Margaret EmdenBertha
George SchelderupDirk
Neville MappJoop
Ivor BarnardAdmiral
John CarolJohann
Philip LeaverChief of Police
Lawrence O'MaddenCaptain Schneider
Anthony EustrelLieutenant Wernicke
Charles MinorBohme
Valentine DyallMarkgraf
Lieutenant SchouwenaarCaptain of the U boat
Lieutenant Van DapperenLieutenant of the U-boat
John ArnoldNavigator of the U boat