So Philo Dufrense is not based on submarine commander Hagbard Celine?
No. Philo was my answer to Ragnar Danneskjold, the blond, blue-eyed, pro-capitalist pirate from Atlas Shrugged. As fans of Atlas know, Ragnar was able to conduct his pirate raids in a surface ship because socialists are too stupid to use radar or satellite tracking. But Philo was going up against representatives of the free market, so I figured he’d need to travel underwater to have a fighting chance. Also, I was a fan of Tom Clancy’s The Hunt for Red October and thought it would be cool to have my own submarine battle.