Sunker's Deep (The Icebreaker Trilogy, Bk. 2)

Can the Sunkers and the Icebreakers put aside their differences to work together? Sharkey was born on a fortunate tide, and everyone in the giant submersible Rampart knows it. He's a hero, a future admiral, beloved by the ancestors. The trouble is, his life is based on a lie. He's been a fake hero for years. But when tragedy strikes, he must become a real one - and he has no idea how to go about it. Meanwhile on land, Petrel, Fin, and the crew of the Oyster are on a mission to defeat the Devouts and bring lost knowledge back into the world. This second installment of the Icebreaker trilogy features action, adventure, and a world that is perhaps not so different from our own.