- Misha Crosby - 3rd Engineer Willey
- Juliet Aubrey - Joy Hawkins
- Rupert Vansittart - Morris Hawkins
- Paul Telfer - Able Seaman McNeill
- Hugh Fraser - Justice Langton
- Nicholas Hutchison - Mr Miller
- Zac Pile - Cadet Housden
- Timothy Blore - Kapitan Prien U47
- Christopher Tester - Ordinary Seaman Cottes
- Stephen Critchlow - 2nd Steward Halloran
- Karim Kronfli - Storekeeper Davies
- Declan Michael Laird - Greaser Boyle
- Elizabeth Arends - Alice Clarke
- James Simmons - Mr Haywood
- Mark Prendergast - Able Seaman McLennan
- Chris Finney - Chief Officer Wilson
- Wink Taylor - Winston Churchill
- Tehmina Sunny - Amanda O'Shea
- Laurence Fuller - Commander Williams
- Jenae Altschwager - US TV Anchor 1
- Klemens Koehring - 1st Lieutenant Admiral Scheer
- Daniel Collard - Kapitan Kranke Admiral Scheer
- Rachel Rath - Assistant Coastguard
- Richard Sanderson - Captain Fegen HMS Jervis Bay
- Kevin Marron - Coastguard
- Isaac Lancel-Watkinson - Robbie
- David Monroe - Stevedore Foreman
- John Mawson
- Jack Bowman
- Misha Crosby
- Andrew Mark Sewell
- Stephen Endelman
- Sean Higgins
- James Boyle
- George Riley
- Helen Quigley
- Sam Dinley
Thomas Brodie-Sangster interpreta a Arthur Hawkins en la serie.
Nathalie Emmanuel hace el papel de Maude Hawkins.
Brian Cox hace el papel de Robert Dodds.
John Malkovich interpreta a Chief Engineer Pollard en la serie.
Harry Hamlin interpreta a Able Seaman Mortimer en la serie.
Craig Robert Young interpreta a Apprentice Jones en la serie.
John Altman hace el papel de Bosun Fletcher.
Blair Redford interpreta a Deck Hand Preston en la serie.
Juliet Aubrey interpreta a Joy Hawkins en la serie.
Rupert Vansittart interpreta a Morris Hawkins en la serie.
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