Sub-Antarctica is where the mightiest current on Earth flows uninterrupted around our planet and the winds blow incessantly eastward. This vast and icy ocean is peppered by a scattering of tiny islands, inhospitable to man but crucial to the survival of millions of marine animals including seals, penguins, albatross and southern right whales that are superbly adapted to life in the Southern Ocean and use these islands to breed. But life on these islands is not easy and sometimes it is deadly. The world's greatest hunters, killer whales, hunt in the shallows of the islands.