Part 2 (1992): Reveals a history of submarines and a basic overview of submariner emergency and weapons training in the United States, Russia and the United Kingdom. With the first breach of a submarine's double hull at depth, water spikes like like a metal rod crushing everything in it's path. An electrical fire means certain death in less than sixty seconds. The slightest error in judgment could result in grounding, propulsion failure or worse... a reactor meltdown. And one wrong move during a hot engagement gives the enemy the only shot he'll ever need. Unless each scenario is handled with the highest degree of professionalism and training, the ship and all hands will be lost. For commanding officer and the enlisted man, this is the brutal reality of the service. Operating on the vanguard of technology, there is no margin for error. Ocean floors are littered with the wreckage of those who failed... duty demands only the fittest survive.