Testimonials

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…

Onstott is truly a bold front-runner in deep subsurface microbiology and a great role model for anyone in geology who aspires to become a successful geomicrobiologist. Reading this book makes me feel lucky to have witnessed some of these explorations firsthand. I am also amazed by their vivid…

Onstott so beautifully conveys his excitement that laypeople and scientists alike will find [Deep Life] a worthwhile read.

Deep Life tackles one of the most mysterious, sexiest questions in science today: Is there life beyond Earth?. . . Onstott’s argument is both profound--we can’t understand life on other planets without understanding life on our own--and surprising, pleasing any amateur extraterrestrial…