In 'Underland,' Robert Macfarlane crafts a masterful exploration of the Earth's secretive underworld, delving into our planet's geological past and projecting into its distant future. From the artistic expressions adorning Norwegian sea caves to the vast ice expanses in Greenland, Macfarlane navigates through 'deep time' to uncover stories of human descents into darkness. He connects the natural wonders with the psychological landscape, revealing a web of under land spaces where humans have harbored their deepest fears and aspirations. Interweaving his travelogues with historical accounts of exploration, the book traverses various cultural and natural formations, including the Parisian catacombs, Bronze Age burial sites, and subterranean ecosystems that enable tree communication. While the narrative explores physical depths, it also addresses profundities of existence, such as the eternal stewardship of nuclear waste. Global in reach and poetic in tenor, 'Underland' invites readers to a profound rethinking of their place within the planet's layered history.