Directed by
| Maurice Kline | ||
| Gustav Della Valle | ... | (underwater sequences) |
Writing Credits
| Curt Siodmak | ... | (creator) & |
| Thomas M. Dykers | ... | (creator) (as Rear Adm. Thomas M. Dykers USN ret.) |
| Curt Siodmak | ... | (screenplay) and |
| William D. Holmes | ... | (screenplay) |
Cast (in credits order) complete, awaiting verification
| Don Megowan | ... | Captain Fathom | |
| Richard H. Cutting | ... | Professor Barclay (as Richard Cutting) | |
 |
Barbara Wilson | ... | Carol Barclay |
| Kenneth Tobey | ... | Jack Clyde (as Ken Tobey) | |
|
|
Rod Williams | ... | Derek Taylor |
| David McMahon | ... | Duncan (as David Eden) | |
| Robert Sampson | ... | Gordon | |
| Rest of cast listed alphabetically: | |||
| David McLean | ... | Seaman Duncan (uncredited) | |
Produced by
| Richard Kline | ... | executive producer |
| Curt Siodmak | ... | producer |
Cinematography by
| Virgil Miller | ||
Editing by
| Maurice Kline | ||
Art Direction by
| Jack Okey | ||
Production Management
| John Pommer | ... | production manager |
Second Unit Director or Assistant Director
| Gustav Della Valle | ... | assistant director: underwater sequences |
| Samuel Schneider | ... | assistant director (as Sam Schneider) |
Music Department
| Horst Ackermann | ... | composer: stock music (uncredited) |
| Ronald Binge | ... | composer: stock music (uncredited) |
| Darrell Calker | ... | composer: stock music (uncredited) |
| Hansgünter Fessel | ... | composer: stock music (uncredited) |
| Herschel Burke Gilbert | ... | composer: stock music (uncredited) |
| Walter Greene | ... | composer: stock music (uncredited) |
| Wilfred Josephs | ... | composer: stock music (uncredited) |
| Hans J. Salter | ... | composer: stock music (uncredited) |
| James Stevens | ... | composer: stock music (uncredited) |
| Leith Stevens | ... | composer: stock music (uncredited) |
| Clarence Wheeler | ... | composer: stock music (uncredited) |
Additional Crew
| Thomas M. Dykers | ... | technical consultant (as Rear Admiral Thomas M. Dykers USN {Ret}) |
