The ship has always been a symbol of the Church on the turbulent sea of this post-Edenic life. It is being steered by Jesus Christ ("the Good Shepherd"). His apostles and their followers are called "fishers of men" (Matthew 4:19). The character Ernest Krause can easily be associated with one of the pastors of the Church, called to watch over the souls hunted by the relentless enemy of man - the devil.
When I’m fed up living with all kinds of fears and I choose to be fearful of only God, I realize that the closer I get to Him, the more I find there’s nothing to be afraid of. Only when I’m far from God do I feel terror; the better I know Him, and His ways with man, the more I realize that my fears have no rational basis.