A ship is stuck by a tsunami and is turned upside down. The surviving passengers have to go up to the bottom of the ship to escape. This is one of the better disaster films. Some good upside down sets with the typical range of characters and trials on the way to escaping.
3/5 
Gene Hackman
Roddy McDowall
Shelley Winters
Leslie Nielsen
Stella Stevens
Carol Lynley
Nathalie Boltt
Adam Baldwin
Ernest Borgnine