"Why do we seek the void?"
Adapted from Robert Macfarlane's bestselling book, this mesmerising documentary journeys into worlds seldom seen by human eyes.
Released in 2026, Underland is a documentary film from Sandbox Films (United States of America). It was directed by Rob Petit and written by Robert Macfarlane and Rob Petit. The cast is led by Sandra Hüller. With a runtime of 1h 19m, the film averages 5.3/10 across 3 TMDB ratings.
To watch Underland online free in HD, press Watch Now above and pick any server; the movie plays instantly on MyFlixer with no account needed. If you like documentary movies, Elstree 1976, McQueen and Come See Me in the Good Light are worth adding to your list.