Deep sea danger thriller starring Halle Berry. Katie (Berry) is an expert in her field but, after an accident had left a fellow diver dead under her command, she hasn't been able to re-enter the water. As the bills begin to pile up and the bank threatens taking her boat as compensation, her boyfriend Jeff (Olivier Martinez) tells her of an opportunity to lead another shark dive. Knowing that this will gain her financial security and possibly get her career back on track, she accepts. But can she prepare for the hungry terror that awaits in the deep?