The Prometheus Corporation has unearthed something ancient and dangerous in its underwater excavations, and now it's come to the surface to make humanity its prey. Their solution? To lure the thing back in the sea and kill everything within a five mile radius, effectively covering the corporation's tracks. And so a disgraced marine biologist must race against the clock and find a way to keep the ocean from being destroyed by the corporation before something even more dangerous is unleashed on mankind...