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"Life thrives in the deepest, darkest recesses of Earth's crust -- from methane seeps in the ocean floor to the highest reaches of Arctic permafrost -- and it is unlike anything seen on the surface. Intraterrestrials shares what scientists are learning about these strange types of microbial life -- and how research expeditions to some of the most extreme locales on the planet are broadening our understanding of what life is and how its earliest forms...