What does it feel like to live in a pressurized metal tube, 1000 feet (300 m) under the ocean, and only steps away from lethally dangerous nuclear fissile material? Nuclear submariners know. In wartime, theirs is an unenviable task - to hunt other submarines and destroy them before they themselves can be hunted down. Nuclear power allows these submarines to operate at high speed for long durations without having to surface frequently. Nuclear submarines...