ESCAPE FROM THE ULTRAMARINE! Arthur's quest to save his people has hit a devastating dead end...but hope is not lost! Together with the Wizard Arion, Aquaman must channel the incredible power of Thalassa the Trilance Saber to escape the dungeon barge descending into the blue and uncover the last desperately needed clue to save the people of Atlantis! But floating amongst all this blue appears to be...a shimmer of green?