Directed by
| Sergio Martino | ||
Writing Credits
| Cesare Frugoni | ... | (story) & |
| Luciano Martino | ... | (story) |
| Sergio Donati | ... | (screenplay) & |
| Cesare Frugoni | ... | (screenplay) & |
| Sergio Martino | ... | (screenplay) |
| H.P. Lovecraft | ... | (story "The Shadow Over Innsmouth") (uncredited) |
Cast (in credits order)
| Barbara Bach | ... | Amanda Marvin | |
| Claudio Cassinelli | ... | Lt. Claude de Ross | |
| Richard Johnson | ... | Edmond Rackham | |
| Beryl Cunningham | ... | Shakira | |
| Joseph Cotten | ... | Prof. Ernest Marvin | |
| Franco Javarone | ... | José (as Franco Iavarone) | |
 |
Roberto Posse | ... | Peter |
| Giuseppe Castellano | ... | Skip | |
| Franco Mazzieri | ... | François (as Francesco Mazzieri) | |
| Rest of cast listed alphabetically: | |||
|
|
Jim Alquist | ... | James (US version) (as James Alquist) |
|
|
Eunice Bolt | ... | Samantha (US version) |
|
|
Tom J. Delaney | ... | Patterson (US version) |
| Mel Ferrer | ... | Radcliffe (US version) | |
| Cameron Mitchell | ... | Decker (US version) | |
|
|
Riccardo Petrazzi | ... | Prisoner on Lifeboat (uncredited) |
| Bobby Rhodes | ... | Rackham's Servant (uncredited) | |
Produced by
| Roger Corman | ... | distribution producer (US dubbed version) (uncredited) |
| Luciano Martino | ... | producer |
Music by
| Luciano Michelini | ||
Cinematography by
| Giancarlo Ferrando | ... | director of photography |
Editing by
| Eugenio Alabiso | ||
Production Design by
| Massimo Antonello Geleng | ||
Costume Design by
| Maria Rosaria Crimi | ||
Makeup Department
| Giancarlo De Leonardis | ... | hair stylist |
| Sergio Gennari | ... | hair stylist |
| Nilo Jacoponi | ... | makeup artist (as Nilo Iacoponi) |
| Erik Jensen | ... | makeup assistant: additional sequences, US version (as Ed Jensen) |
| Kenny Myers | ... | makeup assistant: additional sequences, US version (as Ken Myers) |
| Pamela Peitzman | ... | makeup artist: additional sequences, US version |
| Manlio Rocchetti | ... | makeup artist |
| Stefano Trani | ... | makeup artist |
| Chris Walas | ... | special makeup effects: additional sequences, US version |
| Mark Walas | ... | makeup assistant: additional sequences, US version |
Production Management
| Evi Farinelli | ... | unit manager |
| Marco Giannoni | ... | unit manager |
| Gianni Saragò | ... | production supervisor (as Gianni Sarago) |
| Marcello Tagliaferri | ... | production manager |
| David C. Thomas | ... | production manager: additional sequences, US version (as David Thomas) |
Second Unit Director or Assistant Director
| Steve Jerrom | ... | second assistant director: additional sequences, US version |
| Massimo Manasse | ... | assistant director |
Art Department
| Giacomo Calò Carducci | ... | set dresser (as Giacomo Calo Carducci) |
| Aleka Corwin | ... | art director: additional sequences, US version |
| Adriano Tiberi | ... | prop man |
| John Wright | ... | assistant art director: additional sequences, US version |
Sound Department
| Terry Lynn Allen | ... | sound effects editor: additional sequences, US version |
| Angelo Amatulli | ... | boom operator |
| Anna R. Delanzo | ... | boom operator: additional sequences, US version (as Anna De Lanzo) |
| Bruno Moreal | ... | sound mixer |
| Roberto Petrozzi | ... | sound engineer |
| Anthony Santa Croce | ... | location sound mixer: additional sequences, US version (as Tony Santa Croce) |
| Frank von Kuegelgen | ... | post-synchronization (as F.v.K.) |
Special Effects by
| Dino Galiano | ... | special effects (as Cataldo Galiano) |
| Massimo Antonello Geleng | ... | fishmen designer (as M.A. Geleng) |
| Paolo Ricci | ... | special effects |
Stunts
| Riccardo Petrazzi | ... | stunt coordinator |
Camera and Electrical Department
| Gianlorenzo Battaglia | ... | underwater camera operator |
| Ben Batzdorff | ... | electrician: additional sequences, US version |
| Ray Bilger | ... | gaffer: additional sequences, US version |
| Carol Depace | ... | still photographer: additional sequences, US version (as Carol De Pace) |
| Matt Giordano | ... | chief grip (as Matteo Giordano) |
| Gary Graver | ... | director of photography: additional sequences, US version |
| Willi Knudsen | ... | camera operator: volcanic activity inserts |
| Claudio Morabito | ... | camera operator |
| Armando Moreschini | ... | chief electrician |
| Daniele Nannuzzi | ... | underwater camera operator |
| Randy Nolen | ... | panaglide operator: additional sequences, US version (as Randy Nolan) |
| Angelo Pennoni | ... | still photographer |
| Alfredo Senzacqua | ... | assistant camera |
| Jeff Smith | ... | grip: additional sequences, US version |
| Tim Suhrstedt | ... | assistant camera: additional sequences, US version |
Costume and Wardrobe Department
| Amedeo Monti | ... | wardrobe |
| Luciana Pianella | ... | wardrobe |
Editorial Department
| Joe Dante | ... | associate editor: additional sequences, US version (as Giuseppe Dantini) |
| Silvana Di Legge | ... | cutting room assistant |
| Miller Drake | ... | associate editor: additional sequences, US version |
| Amedeo Moriani | ... | assistant editor |
| Fabrizio Scifoni | ... | cutting room assistant |
Location Management
| Gale Anne Hurd | ... | location manager: Maui, additional sequences, US version (as Gale Hurd) |
Music Department
| Sandy Berman | ... | composer: additional music, US version |
| Luciano Michelini | ... | conductor |
Script and Continuity Department
| Mirella Malatesta | ... | continuity (as Mirella Roy Malatesta) |
Additional Crew
| Laurie Cohn | ... | script supervisor: additional sequences, US version |
| Miller Drake | ... | writer/director: additional scenes, US version |
| Tom McGrath | ... | production assistant: additional sequences, US version |
| Raffaello Saragò | ... | paymaster |
| Matteo Spinola | ... | public relations |
| Luciano De Ambrosis | ... | voice dubbing: Richard Johnson (uncredited) |
| Sergio Graziani | ... | voice dubbing: Joseph Cotten (uncredited) |
