What's in the deep ocean? And how can we study these remote and extreme ecosystems? And how is climate change affecting ocean ecosystems? Prof Alex Rogers explains his research in deep sea ocean hot spots, in some of the most remote and deepest parts of the ocean where there are still complex ecosystems to be found. He describes the challenges of working in extreme environments and how technology is essential for research. He also discusses the adverse effects that climate change is having on ocean ecosystems, and how recent work has identified concerning signs of plastic pollution being found in some of the most remote parts of the ocean; but also the positive actions and interventions that can make a difference.