In this BBC Earth Podcast, we’re exploring the parts of our world that require us to look a little deeper. From the depths of our oceans to the canopies that grace our skylines, we’ll be venturing into unfamiliar pockets of nature with the people who have carved a life out of choosing to study the things that many of us can’t see. We also travel to the bottom of the ocean, and discover how even in the most extreme environments fragments of life persist. What can this alien environment teach us about life’s limits and extraordinary capabilities? C-DEBIer James Bradley talks about the deep biosphere and the findings of his recent Science Advances paper.