True tales of life and death as told by those who fought in the briny depths. From the undersea warfare of World War II through the Cold War stand-offs in the deep to the cutting-edge technology of the modern U.S. Navy, submarines have evolved into the front line of our nation's defence at sea. And the men who sail them have become heroes above and below the waves. These are their stories. Compiled from interviews and recollections from submarine veterans and accompanied by detailed photos and illustrations of both man and machine at work, Sub is a gripping chronicle of undersea warfare as told by those who know firsthand what it means to drop through the hull of a boat, to sink into the dark, freezing waters of the deep-and to have death never more than one torpedo away.