L'Aventure du Poséidon

It's New Year's Eve and the luxury ocean liner Poseidon is on a magnificent voyage from New York to Athens. Unfortunately, disaster befalls passengers and crew when the cruise ship is capsized by a huge tidal wave brought on by a submarine-induced earthquake. Though the casualties are many, 10 passengers survive to make a harrowing journey up to the overturned ship's bottom where they try and escape to safety. (official distributor synopsis)