S1, E1: Antarctica is a land of survivors enduring the most hostile conditions on Earth. 98% of the mainland is covered by ice on which virtually nothing can live. Even the sea freezes over, but the Weddell seal manages to survive. Below the sea ice, conditions have been stable for millennia and life has flourished and diversified. Starfish, sea spiders and three million predatory worms carpet the ocean floor, and sea anemones feast on ocean giants. Islands on the fringes of the continent, free of sea ice, are far more crowded. Huge colonies of king penguins cover the land, and four-ton elephant seals fight for territories on the beach. The abundance of life found here is due to the incredibly rich ocean surrounding the continent.