ZERO HOUR Deep below the surface of the South Pacific, the U.S. Navy cargo ship Panjanq floated, delicately suspended above the ocean bottom. The ultra-expert diving team of Cas Bonner and Steve Chaffee and the beautiful, brilliant undersea geologist Napah Gilchrist knew it was there. They also knew that aboard was a weapon triggered to explode the world's hope for peace. They even knew the time that the instrument of global destruction was computer-programmed to be launched on its mega-murderous mission. But one thing they did not know. How to stop it. And they had just twelve minutes to find out...