Glacier-covered South Georgia Island, deep in the southern Atlantic Ocean, was the focal point of Southern Ocean whaling all the way up to the 1960s. Today it is perhaps the world's largest penguin breeding site, with up to 5 million penguins. It is also a major breeding site for southern fur seals and elephant seals, both driven to near extinction a century ago by fur-trade hunters. And South Georgia Island was the destination of Ernest Shackleton as he made an heroic journey across the Drake Passage in a small boat after being shipwrecked in Antarctica in 1916. Visited with National Geographic Expeditions on the way to Antarctica.