Undertow #1

Plot

Atlantis is the world superpower, and Redum Anshargal is its worst enemy. If you want to break free of the system, he can offer you a place at his side, exploring the wild surface world in his watertight city barge The Deliverer. He and his hostage-protege Ukinnu Alal hunt the Amphibian, a legend that could be the key to an air-breathing life on land. But as they become the hunted, can Anshargal's team survive long enough to turn the tables on the godlike beast they set out for?