A crack team of Italian naval divers plan to attach high explosives to the hulls of Royal navy warships anchored in Gibraltar harbour.
| Directing | Duilio Coletti | Director |
| Writing | Giuseppe Berto | Writer |
| Writing | Marc-Antonio Bragadin | Writer |
| Writing | Duilio Coletti | Writer |
| Writing | Enzo Cossa | Writer |
| Writing | Ennio De Concini | Writer |
| Writing | Francesco De Robertis | Writer |
| Production | Enzo Cossa | Producer |
| Production | Luigi De Laurentiis | Producer |
| Sound | Nino Rota | Original Music Composer |
| Camera | Aldo Tonti | Director of Photography |
| Editing | Gisa Radicchi Levi | Editor |
| Art | Mario Rappini | Production Design |
| Costume & Make-Up | Mario Rappini | Costume Design |
| Directing | David Carbonari | Assistant Director |
| Directing | Gian Giacomo Cossa | Assistant Director |
| Sound | Aldo Calpini | Sound |
| Sound | Paolo Uccello | Sound |
| Camera | Victor De Sanctis | Underwater Camera |
| Camera | Francesco Solitario | Key Grip |
| Camera | Aldo Tonti | Underwater Camera |
| Directing | Giovannella Zannoni | Script Supervisor |