The movie was re-released in 1939 with some added footage about the dangers of German submarine warfare and a name change to "U 67" . With the added footage the copyright of the movie was changed to 1939 for release of the new title "U 67". That is why there are two versions of the movie with different copyright dates.
One of over 200 titles in the list of independent feature films made available for television presentation by Advance Television Pictures announced in "Motion Picture Herald" 4/4/42. At this time, television broadcasting was in its infancy, almost totally curtailed by the advent of World War II, and would not continue to develop until 1945-46. Because of poor documentation (feature films were often not identified by title in conventional sources) no record has yet been found of its initial television broadcast. It's earliest documented telecasts took place in New York City 1/20/49 on WATV (Channel 13), in Fort Worth 7/8/49 on WBAP (Channel 5), in Albuquerque 10/16/49 on KOB (Channel 4), and in Los Angeles 1/22/50 on KNBH (Channel 4).