drama films American silent feature films American spy films American black-and-white films Films based on Spanish novels Films based on works by Vicente Blasco Ibáñez Films directed by Rex Ingram Films set in the Mediterranean Sea Metro-Goldwyn-Mayer films U-boat fiction World War I naval films World War I spy films World War I submarine films 1920s rediscovered films 1926 romantic drama films Rediscovered American films 1920s American films Silent romantic drama films Silent adventure films Silent war films Silent American drama films