Dr Chris and Dr Xand van Tulleken track down the most awesome, incredible things in the universe! This time it's all about ice. They follow a group of top scientists and explorers to get to find out how icebergs are born and what happens to them before they melt and disappear. They arrive at Store Glacier in Greenland, a gigantic 400-million-kilometre river of ice that releases a mind-boggling 15 billion tonnes of ice into the sea each year as icebergs. Scientist Alun Hubbard risks his life to plant a GPS tracker on a huge tower of ice right at the front of the berg. Show less