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Watch Sworn to Secrecy: Secrets of War Season 4 Episode 9 Online

  • 6/10
  • COUNTRIES: United States of America,South Korea,United Kingdom,France,Germany,Russia,Vietnam
  • Subtitles: English

From silent one-man midget subs to U-boats on secret missions, both sides used secret submersibles of all shapes and sizes to conduct clandestine warfare in the war.