A great silence has settled upon a drowned world. In the final battle of their final war, the massive citysubs Universalis and Population reduced each other to ruins. One lays wrecked on the seafloor. The other, beached and lifeless, litters the island of pristine polar ice it tried to destroy. Pockets of survivors huddle together. On the frigid surface, Ralla Gattley and Thom Vargas cling to life and each other. Below, the soldier Geran Lo fights relentlessly to free trapped and drowning civilians. As they struggle against a world determined to kill them, a new and even more dangerous menace approaches. Undersea Atrophia is the second book in the Undersea Saga.