A good book on bacteria living deep underground is 'The Deep Hot Biosphere' by Thomas Gold: http://en.wikipedia.org/wiki/Thomas_Gold#The_Deep_Hot_Biosphere http

A good book on bacteria living deep underground is 'The Deep Hot Biosphere' by Thomas Gold: http://en.wikipedia.org/wiki/Thomas_Gold#The_Deep_Hot_Biosphere http://en.wikipedia.org/wiki/Thomas_Gold#The_Deep_Hot_Biosph... It's somewhat controversial, but it's a good read.