A typical training and patrol mission aboard a nuclear submarine turns into a desperate battle for survival miles deep in Arctic waters in this taut action thriller. A team of research scientists led by Rick Postley (Stephen Baldwin, The Usual Suspects), and Laura Dyson (Gabrielle Anwar, Scent Of A Woman), piggy-back their submersible pod to the nuclear attack sub Portland to collect a series of measurements of the Arctic ice. But when a mysterious Russian sub engages them in a deadly game of cat-and-mouse, the Portland nose dives stright to the bottom, way beyonds its crush depth. Now it's up to Postley and Dyson to save the surviving crew buried beneath the polar ice cap in a heart-stopping race against the clock before time-and oxygen-run out.