Also Known As:- The Snorkel
- Delitto in tuta nera
- Den smygande döden
- Der Schnorchel
- Hiipivä kuolema
- L'homme au masque de verre
- La máscara submarina
- O dolofonos me tin kokkini maska
- Guy Green
- Peter Myers
- Jimmy Sangster
- Anthony Dawson
- Peter van Eyck ... Paul Decker
- Betta St. John ... Jean Edwards
- Mandy Miller ... Candy Brown
- Grégoire Aslan ... Inspector
- William Franklyn ... Wilson
- Marie Burke ... Daily Woman
- Irene Prador ... French Woman
- Henri Vidon ... Italian Gardener
- Flush ... Toto - the dog
- Mary Chapman
- Armand Guinle ... Waiter
- Robert Rietty ... Station Sergeant
- David Ritch ... Hotel Clerk
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