The initial screenplay by Eric Hughes followed the original book much more closely. Original director Stanley Kramer felt Hughes' screenplay was too politicized, and its version of Dirk Pitt wasn't likable enough to be a hero. He hired Adam Kennedy to re-write the screenplay into a more traditional adventure movie. Clive Cussler made it known that he preferred Hughes' version of the script, but producer Sir Lew Grade felt that Kennedy's version had more box-office potential, and filmed with that script when he took over the project.

Film

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