After "The Poseidon Adventure", in which the ship got flipped over by a tidal wave, the ship drifts bottom-up in the sea. While the passengers are still on board waiting to be rescued, two rivaling salvage parties enter the ship on search for money, gold and a small amount of plutonium.

• Warner Bros. Pictures
• Michael Caine
• Sally Field
• Telly Savalas
• Peter Boyle
• Jack Warden
• Shirley Knight
• Shirley Jones
• Karl Malden