Terry Tempest Williams in The New York Times:
You know a book has entered your bloodstream when the ground beneath your feet, once viewed as bedrock, suddenly becomes a roof to unknown worlds below. The British writer Robert Macfarlane has written such a book. “Underland: A Deep Time Journey” is an epic exploration and examination of darkness and the caverns underground that have captured our imaginations, pulled us downward, housed our dead and allowed us to bury our most violent secrets. It is also a descent into the beauty where dark wisdom is located. Macfarlane divides his explorations into three sections, or “chambers,” devoted to “Seeing,” “Hiding” and “Haunting.” As he moves through them, he will take us to ancient barrows in Britain’s Mendip Hills, the understory of the Epping Forest and a physics lab investigating “dark matter” from deep within a coastal Yorkshire mine. He will guide us through underground rivers in Italy and show us the pictographs known as “the red dancers” found in Norwegian sea caves.
Macfarlane homes in on “something seemingly paradoxical: that darkness might be a medium of vision, and that descent may be a movement toward revelation rather than deprivation.” Night vision becomes an essential strategy for survival in the Anthropocene, the new epoch we find ourselves in, which registers the human press on the planet as a geologic force. “For more than 15 years now,” Macfarlane explains, “I have been writing about the relationships between landscape and the human heart. What began as a wish to solve a personal mystery — why I was so drawn to mountains as a young man that I was, at times, ready to die for love of them — has unfolded into a project of deep-mapping.”