Sworn to Secrecy: Secrets of War - Season 4 Episode 9
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.
- Genre: War & Politics, Documentary
- Studio: History
- Keyword: spy, world war ii, cold war, world war i, gulf war, vietnam war, third reich (iii reich 1933-45)
- Cast: Charlton Heston
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