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.
Rod Taylor
as Marian Casey
Stuart Whitman
as Stack Baker
Elke Sommer
as Ursula
Keenan Wynn
as Meat Cleaver Stewart
Jeremy Kemp
as Reginald Landers
Bob Phillips
as Joe
Jennie Sherman
as Debbie
Keith Foote
as Lincoln
