Doctors Chris and Xand van Tulleken continue to find out more from the team of experts and explorers in Greenland about glaciers and icebergs. They explore an incredible but dangerous underground world of massive caves and awesome tunnels within the billions of tonnes of ice that is Store Glacier. The team play a hi-tech version of Poohsticks in a glacial river and nature expert Chris Packham shares his dinner with a cute little arctic fox. Show less