Hurricane Mara tore open the Atlantic seafloor. It should have stayed buried.
Salvage captain Nolan Graves is desperate enough to accept a high-paying, off-the-books mission from a shadowy corporation: dive into a newly exposed, classified trench to recover a black box lost since 1986.
But when a catastrophic landslide traps his submersible at eleven thousand feet, the recovery job becomes a fight for survival. Seeking refuge in the rusted ruins of a sealed Cold War habitat, Nolan's crew discovers a terrifying truth: the Navy didn't just lose a submarine down here. They buried a secret.
Trapped in the crushing depths, they are no longer alone. Something ancient and blind is hunting them by sound and pressure. It knows they are in the water. And it has waited forty years to feed again.