Inspired by Robert Macfarlane’s bestselling book, Underland is a visually arresting documentary that plunges into the hidden worlds beneath our feet—places few humans have ever seen, yet which shape our past, present and future.

Beginning in the thin soils beneath an ancient ash tree, the film follows a remarkable group of “underworld astronauts” as they journey through sacred prehistoric caves, flooded storm drains, melting glaciers, underwater burial chambers and a vast subterranean laboratory built to probe the mysteries of the Universe.

With its poetic, immersive approach, Underland invites audiences to reconsider humanity’s relationship with the Earth. Instead of looking to the stars for answers, the film asks whether the key to understanding civilisation—its origins and its fate—lies in the depths below our fragile surface.