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The summary for this film was based on the viewing of an incomplete print. The opening of the film, aboard the U-Boat and on the deserted island, is performed in German without English subtitles. According to contemporary sources, part of the film was shot in two-color Technicolor. In the press conference scene, "Dr. Chapman" announces that he is going to screen some underwater color footage, but that footage was missing from the viewed print. According to Motion Picture Daily, the film was released under the title Hell's Cargo in most territories, but exhibitors were permitted to use the orginal title if inclined. M-G-M's 1933 film of a similiar title, Hell Below, was believed to have been the reason for the title change.