Bill Travers
Joe Ryan
William Sylvester
Sam Slade
Vincent Winter
Sean
Christopher Rhodes
McCartin
Joseph O'Conor
Prof. Hendricks
Bruce Seton
Prof. Flaherty
Martin Benson
Dorkin
Maurice Kaufmann
Radio Reporter
Basil Dignam
Admiral Brooks
Barry Keegan
Mate
Tommy Duggan
First Naval Officer
Howard Lang
First Colonel
Dervis Ward
Bosun
Mick Dillon
Gorgo
Nigel Green
Bulletin Announcer (Uncredited)