With every expedition the record deep Kolkina Hole cave expands into even more kilometres of underground galleries. What life is there at the bottom? How can microbes in caves tell us more about evolution on Earth? Where does man fit into an ecosystem untouched by people for millions of years? Speleologist, researcher at the National Natural History Museum of the Bulgarian Academy of Sciences and National Geographic, and FameLab finalist Violeta Zhelyazkova will tell you about the obstacles and the resilience she needs to have when climbing down into virgin ecosystems. Hear what it is like to work for days on end at 500 meters under the surface.