A chance meeting leads two former college friends into a search for sunken treasure, a search which involves them with the double dealing Landers, supporter of their expedition treasures is discovered, but Landers traps them in an underwater cave.
| Actor | Role |
|---|---|
 Rod TaylorMarian Casey | Marian Casey |
 Stuart WhitmanStack Baker | Stack Baker |
 Elke SommerUrsula | Ursula |
 Keenan WynnMeat Cleaver Stewart | Meat Cleaver Stewart |
 Jeremy KempReginald Landers | Reginald Landers |
| BBob PhillipsJoe | Joe |
| JJennie ShermanDebbie | Debbie |
| KKeith FooteLincoln | Lincoln |