• 
  Jack Hawkins

  Ericson
• 
  Denholm Elliott

  Morell
• 
  Fred Griffiths

  Gracey
• 
  Bruce Seton

  Tallow
• 
  Virginia McKenna

  Julie Hallam
• 
  June Thorburn

  Doris Ferraby
• 
  Liam Redmond

  Watts
• 
  Alec McCowen

  Tonbridge

• 
  Walter Fitzgerald

  Warden
• 
  Russell Waters

  A.R.P. warden
• 
  Megs Jenkins

  Tallow's sister
• 
  Donald Sinden

  Lockhart
• 
  Harold Goodwin

  Asdic operator
• 
  Meredith Edwards

  Yeoman Wells
• 
  Barry Letts

  Raikes

• 
  Moira Lister

  Elaine Morell
• 
  Stanley Baker

  Bennett
• 
  George Curzon

  Admiral at party
• 
  Glyn Houston

  Phillips
• 
  John Stratton

  Ferraby
• 
  John Warner

  Baker