Oscar-nominee Sandra Hüller narrates this cinematic adaptation of Robert Macfarlane's bestselling book, 'Underland'. The documentary voyages into worlds rarely glimpsed by human eyes to explore the world beneath our feet. One not of fear and darkness, but rather of knowledge and wonder that can be found nowhere else. Beginning in the shallow soils beneath an old ash tree, we travel alongside several 'astronauts of the underworld' into ancient sacred caves, flooded storm drains, melting glaciers, underwater burial chambers and a deep underground laboratory built to solve the mysteries of the Universe. 'Underland' dives deep into the Earth to present a groundbreaking vision for rethinking our lives on this fragile surface.