Halle Berry stars in this deep sea action thriller. Katie (Berry) is an expert in her field but after a fatal accident involving a fellow diver under her command she refuses to get back into the water. Her business begins to suffer and the bills begin to pile up as the bank threaten to take her boat as compensation when her boyfriend Jeff (Olivier Martinez) tells her of a lucrative opportunity to lead another shark dive. Knowing that this will gain her financial security and possibly get her career back on track, Katie accepts. But is she ready to confront her past and face her biggest fears?