"Wrestles with the human compulsion to . . . explore a world that is every bit as hostile as it is beautiful. . . . A very vivid book. . . . Ms. Heinerth is very good at making you understand both the otherworldly euphoria and claustrophobic horror of cave diving." -- Wall Street Journal

"Superb, honest, incredibly engaging . . . a captivating biography and a love letter to a sport where any small mistake can result in death--and any perfect dive can mean an amazing discovery." -- NPR

"Exhilarating . . . Heinerth offers a fish's-eye view of the terrifying beauty of the deep blue sea." -- O Magazine

"Breathtaking . . . Written in cinematic detail, Into the Planet is a thrilling portrait of bravery, innovation, and the extreme limits of human capability. . . . one of the most hair-raising accounts of extreme exploration I've read in recent memory." -- Gizmodo

"A hugely enjoyable, inspiring, and thrilling self-exploration of the life of Jill Heinerth, one of the world's greatest living explorers." -- Diver

"An eye-opening, edge-of-the-seat, thrill of a read that's destined to become a trail blazing classic of diving literature." -- Nektonix

“A meditation on the paradoxical power of fear.” -- Sierra Magazine

"Gripping." -- AARP Magazine

"A breathtaking thrill-ride. Few people have witnessed the sublime beauty of labyrinthine underwater caves or the inside of an iceberg but Jill Heinerth knows these realms intimately. Her courage and heart are as evident in her writing as they are in her groundbreaking explorations." -- Susan Casey, author of The Wave: In Pursuit of the Rogues, Freaks, and Giants of the Ocean

"Heinerth will not look back on her life with any regrets about a lack of bravery or passion. In this gripping story, we plunge into Heinerth's eccentric world of death-defying caves, and into her inner sanctum forged by the thrill of discovery. I read wide-eyed, page after page." -- Diana Nyad, long-distance swimmer and author of Find a Way

"By turns terrifying, exhilarating, and inspirational . . . Talk about extreme adventure. If you don't know the name Jill Heinerth, prepare to be dazzled and astonished. Move over, Jon Krakauer. This well-written memoir is destined to become a world classic of exploration literature." -- Ken McGoogan, author of Fatal Passage

"Cave divers are another breed, which I never truly understood; that is until I met Jill Heinerth on a cave diving trip off Santa Cruz Island and had a chance to read her new book Into the Planet, which helped to explain it all. A Must Read!" -- Dr. Robert D. Ballard, Discoverer of the RMS TITANIC

"A thrill ride into unfamiliar worlds." -- Publishers Weekly

"Jill Heinerth's lifelong passion to explore the most hidden recesses of our planet has driven her to boldly go where--quite literally--no one had gone before. She takes us along on her awe-inspiring journey, revealing the oceans of opportunity that exist right beneath our very feet." -- Richie Kohler, shipwreck explorer and subject of the New York Times Best Seller Shadow Divers

"Into the Planet chronicles, in chiseled prose, a lifetime pursuing science and discovery in exploration's most lethal and least forgiving discipline. Time and again, Heinerth has ventured into realms where mishap can, quite literally, take your breath away. Just reading about her exploits can do the same." -- James M. Tabor, author of Blind Descent and Forever on the Mountain

"A compelling story of an adventurous, bold life yielding rewards of love, discovery, and personal growth." -- Bernie Chowdhury, author of The Last Dive