Deep Life: The Hunt for the Hidden Biology of Earth, Mars, and Beyond

"Tullis Onstott has been at the forefront of the exploration of [Earth's] subterranean mysteries. . . . A microbiologist Indiana Jones, clambering through dimly lit mining tunnels far below the surface, sampling tubes in hand. . . . Along the way, he addresses some of the deepest questions—if you'll excuse the pun—in modern biology."—Lewis Dartnell, Times Higher Education

"[Onstott] so beautifully conveys his excitement . . . a worthwhile read."—Publishers Weekly

"[An] amazing journey."—Cosmos

"The discovery of deep biosphere is a fascinating chapter in the history of astrobiology, and Onstott was at the bottom of it all—literally, when he and his team were searching for life in the deepest mines on Earth. This detailed and well-written book explains the importance of the subsurface biosphere and why those of us interested in the search for life on Mars are so interested in life deep underground."—Chris McKay, NASA Ames Research Center