The generic elements in this horror thriller from Disney are all quite familiar: jewel thieves, luxury liner, a South China Sea monster that seems conceived as a deep-sea equivalent to Alien’s. But writer-director Stephen Sommers (Rudyard Kipling’s The Jungle Book) is so efficient in placing and executing his cliches that he gives you a chilling run for your money. The monster itself, designed by the estimable Rob Bottin, makes a belated appearance, but there’s plenty of well-timed suspense in the meantime, and Treat Williams, Famke Janssen, Wes Studi, Kevin J. O’Connor, and Anthony Heald make up a highly serviceable cast. Predictably overextended, this is a creepy jaunt that occasionally wears one out but never flags. (JR)