Three deep sea divers get involved in murder while searching for a lost treasure.
| Actor | Role |
|---|---|
 John BromfieldBrannigan | Brannigan |
 Lon Chaney Jr.Swede | Swede |
 Victor JoryProfessor | Professor |
 Barbara NicholsMimi | Mimi |
 Tessa PrendergastAlita | Alita |
| EEric CoverlyChavez | Chavez |
| VVincent ChangDomingo | Domingo |
| TTheodore PurcellBig Boy | Big Boy |
| VVere JohnsBianco | Bianco |
| JJack LewisWarren | Warren |
| AArnold ShanksAleppo | Aleppo |
| CClyde HoyteCalypso | Calypso |