2/3. Author Andrew Smith goes deep into the lives of submariners across the generations.

The combination of the ballistic missile and the nuclear-powered submarine changed everything - warfare, the balance of world power and, of course, submarining. For the duration of the Cold War the real front line stretched across millions of miles of dark water. Former Soviet, British and American commanders and crew reveal the unique pressures, intense boredom and underwater strategy that required them to remain hidden or hunted.