Recently, nuclear submarines of the United Kingdom and the Soviet Union have mysteriously disappeared one after another! This phenomenon attracted the great attention of the British military, and of course it was time for ace agent 007 Bond (played by Roger Moore) to appear. After investigation, Bond finally discovered that the mastermind behind the scenes turned out to be the world's richest shipping tycoon Stenberg. In order to realize his ambition to conquer the world, he built an underwater city. Steinberg hired scientists with a high salary to develop a submarine tracking system, taking possession of the British and Soviet nuclear-powered submarines for himself. He planned to use nuclear missiles to blow up New York and Moscow, realizing his ambition to destroy two superpowers in one go. 007 is about to enter the underwater city to stop this maniac's crazy plan.