This book was a great follow up to the first. The large spreads of underwater creatures and landscapes were beautifully done.
The military angle was great–it showed how Clark developed a love of America, learned more about he struggles of his fellow man, but at the same time how the experience taught him that his mission was different from that of a soldier. I think the Atlantis story is also a set up for him to learn about the kind of leader he really wants to be too.
Very well done character exploration!