- Robert Hoffmann - U-Boat Captain
- Dan van Husen - U-Boat First Officer
- George Mikell - Captain of Ehrenfels
- Jürgen Andersen - First Officer of Ehrenfels
- Bernard Archard - Underhill
- Martin Benson - Mr. Montero
- Percy Herbert - Dennison
- Donald Houston - Hilliard
- Glyn Houston - Peters
- Terence Longdon - Malvern
- Allan Cuthbertson - Dickie Melborne
- Faith Brook - Mrs Doris Grice
- John Standing - Finley
- Graham Stark - Don Manners
- Jack Watson - Maclean
- Moray Watson - Breen
- Michael Medwin - Langley
- William Morgan Sheppard - 'Patch' Lovecroft
- Patrick Holt - Barker
- Clifford Earl - Sloane
- Brook Williams - Butterworth
- Victor Langley - Williamson
- Marc Zuber - Ram Das Gupta
- Mohan Agashe - Brothel Keeper
- Andrew V. McLaglen
Capítulo disponible en las siguientes plataformas: