Posing as an ex-German medical officer, a U. S. Navy Intelligence Officer sets out to rescue a kidnapped scientist, and sink a Nazi submarine, hiding off the coast of South America.
Unfortunately the movie Mystery Submarine is not yet available on HBO Max.
| Writing | George W. George | Story |
| Directing | Douglas Sirk | Director |
| Writing | George F. Slavin | Screenplay |
| Production | Ralph Dietrich | Producer |
| Art | Bernard Herzbrun | Art Direction |
| Editing | Virgil W. Vogel | Editor |
| Art | Otto Siegel | Set Decoration |
| Costume & Make-Up | Bill Thomas | Costume Design |
| Crew | David S. Horsley | Special Effects |
| Camera | Clifford Stine | Director of Photography |
| Directing | Frank Shaw | Second Unit Director |
| Art | Robert Boyle | Art Direction |
| Costume & Make-Up | Joan St. Oegger | Hairstylist |
| Sound | Leslie I. Carey | Sound |
| Sound | Joe Lapis | Sound |
| Art | Russell A. Gausman | Set Decoration |
| Crew | B.R. Van Buskirk | Technical Advisor |
| Sound | Joseph Gershenson | Music Director |
| Costume & Make-Up | Bud Westmore | Makeup Artist |
