The crew of an atomic submarine battle to save the world from global destruction.
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.
Two helicopter pilots rush aid to a small town devastated by a flood following the collapse of an aging dam.
