Introduction
Triassic park
The treasure of Cerro Negro
Bikers, bombs, and the death-o-meter
Microbes in meteorites?
Life in deepest, darkest Africa
Hunting for water and carbon
The subterranauts
A lot of breaks and one lucky strike
Life beneath the ice
The worm from hell
Epilogue
Appendix A: Chronology of the exploration of subsurface life
Appendix B: Chronology of the meeting of the U.S. DOE's SSP meetings.