With marine biologist and research diver Uli Kunz, we explore the warm and cold coasts of our planet in this two-parter – and show the incredible diversity of life: We accompany a unique expedition to the remote Chagos Archipelago in the Indian Ocean, visit islands that hardly any humans have set foot on – and find out how seabirds contribute to the health of coral reefs. In Greenland, the largest island in the world, Uli Kunz dives into the magical world beneath the ice. We visit climate scientists in a research camp in the middle of the Greenland ice – and show how rapidly the world around the Arctic Circle is changing.