Directed by
| Antonio Leonviola | ... | (as Leonviola) |
| Marc-Antonio Bragadin | ... | (collaboration) |
| Carlo Lizzani | ... | (uncredited) |
Writing Credits (in alphabetical order)
| Marc-Antonio Bragadin | ... | (screenplay) |
| Marc-Antonio Bragadin | ... | (story) |
| Franco Brusati | ... | (uncredited) |
| Gian Giacomo Cossa | ... | (screenplay) |
| Gian Giacomo Cossa | ... | (story) |
| Ennio De Concini | ... | (screenplay) |
| Ennio De Concini | ... | (story) |
| Carlo Lizzani | ... | (uncredited) |
Cast (in credits order) complete, awaiting verification
| Raf Vallone | ... | Commandante Carlo Ferri | |
| Franco Fabrizi | ... | Antonio | |
| Andrea Checchi | ... | Giorgio | |
| Ettore Manni | ... | Marco | |
| Enrico Maria Salerno | ... | Virgilio | |
| Christian Marquand | ... | Paolo (as Cristian Marquand) | |
| Bud Spencer | ... | Magrini (as Carlo Pedersoli) | |
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Elena Varzi | ... | Anna Avanzi |
| Rest of cast listed alphabetically: | |||
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Paolo Bergamaschi | ... | Un secondo superstite |
| Nerio Bernardi | ... | Capitano Mauri | |
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Franco Chianese | ... | Sommergibilista |
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Emilio Cigoli | ... | Ammiraglio Bragadin |
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Giovanni De Fazio | ... | Pietro |
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Evar Maran | ... | Un superstite |
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Gino Anglani | ... | Agente segreto (uncredited) |
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Dora Calindri | ... | Madre di Virgilio (uncredited) |
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Saverio Capriò | ... | Un terzo superstite (uncredited) |
| Cesare Fantoni | ... | Ammiraglio a Roma (uncredited) | |
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Livio Lorenzon | ... | Sergente (uncredited) |
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Albino Morandin | ... | Capo pontone (uncredited) |
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Federico Scarlatti | ... | Commandante sommergibile (uncredited) |
Produced by
| Dino De Laurentiis | ... | producer |
| Carlo Ponti | ... | producer |
Music by
| Angelo Francesco Lavagnino | ... | (as Angelo F. Lavagnino) |
Cinematography by
| Riccardo Pallottini | ||
Editing by
| Renato Cinquini | ||
Art Direction by
| Flavio Mogherini | ||
Set Decoration by
| Giorgio Giovannini | ... | (uncredited) |
Makeup Department
| Thea Boggiatto | ... | makeup artist (as Thea Boggiato) |
Production Management
| Marc-Antonio Bragadin | ... | production manager |
| Enzo Cossa | ... | general production manager |
| Livio Maffei | ... | unit production manager |
Second Unit Director or Assistant Director
| Renzo Avanzo | ... | second assistant director |
| Gian Giacomo Cossa | ... | assistant director |
Sound Department
| Amelio Verona | ... | sound |
Camera and Electrical Department
| Victor De Santis | ... | underwater photographer |
| Antonio Modica | ... | camera operator |
| Mario Parapetti | ... | camera operator |
Editorial Department
| Cleofe Conversi | ... | assistant film editor |
Music Department
| Angelo Francesco Lavagnino | ... | conductor (as Angelo F. Lavagnino) |
Script and Continuity Department
| Guido Malatesta | ... | script supervisor |
| Milena Splendore Pulejo | ... | script supervisor |
Additional Crew
| G.M. Bragadin | ... | production secretary |
| G. Marzacchi | ... | production secretary |
| Manlio Busoni | ... | italian voice dubbing: Franco Fabrizi - some scenes (uncredited) |
| Giorgio Capecchi | ... | italian voice dubbing: Andrea Checchi (uncredited) |
| Emilio Cigoli | ... | italian voice dubbing: Raf Vallone (uncredited) |
| Gualtiero De Angelis | ... | italian voice dubbing: Ettore Manni (uncredited) |
| Pino Locchi | ... | italian voice dubbing: Christian Marquand (uncredited) |
| Giulio Panicali | ... | italian voice dubbing: Enrico Maria Salerno (uncredited) |
| Bruno Persa | ... | italian voice dubbing: Bud Spencer - some scenes (uncredited) |
| Mario Pisu | ... | italian voice dubbing: Emilio Cigoli (uncredited) |
| Giuseppe Rinaldi | ... | italian voice dubbing: Bud Spencer - some scenes (uncredited) |
| Stefano Sibaldi | ... | italian voice dubbing: Franco Fabrizi - some scenes (uncredited) |
| Lydia Simoneschi | ... | italian voice dubbing: Elena Varzi (uncredited) |