 Early this year, scientists revealed that they had found the deep microbiome up to 20 kilometers down into the crust. There is life. Wow. And this life is of such volume that it exceeds by hundreds of times the total biomass of all human life on Earth right now. It's so diverse, they call it the Amazon or the Galapagos of the underworld. What kinds of organisms are living there? It's all microbial life. It's bacteria, predominantly.