Cast

• George O'Brien - Cmdr. Robert 'Bob' Kingsley
• Marion Lessing - Anna Marie Von Steuben
• Mona Maris
  Mona Maris
  Mona Maris was an Argentine film actress who was born in Buenos Aires.-Ancestry and education:Her given name was Mona Maria Emita Cap de Vielle. Her mother was a Spanish Basque and her father a French Basque...
  
   - Fraulein Lolita
• Walter C. Kelly - Chief Mike 'Guns' Costello
• Warren Hymer
  Warren Hymer
  Warren Hymer was an American film actor. He appeared in 129 films between 1929 and 1946.He was born in New York, New York, and died in Los Angeles, California...
  
   - 'Lug' Kaufman
• Steve Pendleton
  Steve Pendleton
  Steve Pendleton was an American film actor. He appeared in over 150 films between 1923 and 1960. He died in Pasadena, California, aged 76.-Selected filmography:* Manslaughter * Seas Beneath...
  
   - Ens. Richard 'Dick' Cabot (as Gaylord Pendleton)
• Walter McGrail
  Walter McGrail
  Walter McGrail was an American film actor. He appeared in over 150 films between 1916 and 1951.He was born in Brooklyn, New York and died in San Francisco, California, at the age of 81.-Selected filmography:...
  
   - Chief Joe Cobb
• Larry Kent
  Larry Kent
  Larry Kent was an American film actor and producer.-Career:Between 1925 and 1964 Kent acted in 52 films and a handful of TV shows including Rawhide. He had a successful career as a lead and supporting actor in the silent era but failed to make the transition to sound films and was cast largely in...
  
   - Lt. 'Mac' McGregor
• Henry Victor
  Henry Victor
  Henry Victor was an English-born character actor. Raised in Germany, Victor is probably best remembered for his portrayal of the strongman Hercules in Tod Browning's 1932 film Freaks. He originally was a leading figure in UK silent films...
  
   - Baron Ernst von Steuben (U-boat commander)
• John Loder
  John Loder (actor)
  John Loder was a British-American actor. He was born William John Muir Lowe in London.-Early life:Loder's father was General W. H. M. Lowe, the British officer to whom Patrick Pearse, the leader of the 1916 Easter Rising in Dublin, Ireland, surrendered...
  
  - Franz Shiller