Desc: Operación Úrsula (El misterio del submarino C-3): Directed by José Antonio Hergueta. With Jose Coronado, Willard C. Frank, Antonio Checa, Ángel Viñas. A missing submarine in Spanish Civil War leads to the first German Navy operation before WW2. Republican submarine C-3 was the victim of international secrecy and intrigues, after a torpedo from U-34 sunk it on December 12th 1936.