In the Southern Hemisphere, an unknown continent lies largely hidden below the ocean’s waves: Zealandia. Located off Australia’s eastern coast, its existence was announced to the world in 2017. 95% of its five-million-square-kilometre surface is covered by water, with only New Zealand, New Caledonia and around 700 smaller islands visible from above. Geologists believe that this is the world’s eighth continent. In this two-part documentary, director Lars Pfeiffer sets out to discover how and why Zealandia disappeared from the Earth’s surface millions of years ago, and how its discovery changes our understanding of our planet. The first episode explores how the continent was originally discovered and examines the geological evidence for its existence. How did scientists determine its boundaries? Do its mountains and valleys impact life far above? How have some descendants of dinosaurs managed to survive here – and how did humans eradicate others? The second episode dives deeper into this unknown continent. Why are the flora and fauna that inhabit the visible parts of Zealandia so very different to plants and animals elsewhere? Why do humpback whales appear to be drawn to the peaks of Zealandia’s underwater mountains? Why do penguins here live in the forest? And how does one particular bird species withstand the toxic heavy metals the Earth has brought forth? A fascinating journey to a continent unknown until just a few years ago – a world we are only just beginning to understand.