Narrated by David Attenborough. The Atlantic bluefin tuna, one of the largest, fastest, most prized fish in the sea, is now being fished to the brink of extinction. Revealing the secrets of this legendary, warm-blooded animal, this film seeks to find the tuna’s place in the vast marine ecosystem. Marine biologist and wildlife cameraman Rick Rosenthal’s passion for bluefin was sparked years ago when he  witnessed an extraordinary underwater spectacle in the pristine blue waters of the Azores:  large numbers of dolphins, seabirds and tunas working together in a ferocious three-dimensional attack. But today the waters of the Azores are quiet. What’s become of the bluefin and their feeding frenzies? Venturing across the north Atlantic, up the restless Gulf Stream, and to the depths of the tuna’s sprawling range, Rosenthal spends 13 years in pursuit of the bluefin.