40 million years ago, "The Rifting" began. When the Earth's crust along Africa's eastern plain started to thin, a massive fault line formed. As the continent split apart, the land on either side collapsed and lava thrust up from within the earth, leaving a massive depression of highlands and volcanoes - The Great Rift Valley. Formed from the remains of a 2.5 million-year-old imploded volcano, the Ngorongoro crater is a study in contradictions: on one hand, it's a self-sustained and plentiful land that provides for the many animals that call it home. Conversely, its isolation threatens the existence of many of its key species. What does the future hold for this unique habitat?