Darwin, Australia. Hundreds of scientists from around the world try ‘to catch the perfect thunderstorm’. The storm is one of the largest on the planet, it even has a name, ‘Hector’. The scientists call themselves I.C.E, the ‘International Cloud Experiment’. They are armed with some of the best gadgets money can buy; 7 planes, a ship, 1000 weather balloons. They have some of the best pilots in the world. Clouds are the sleeping giant of the climate change puzzle. As the Earth’s battle with the sun heats up, they are our first line of defence. At the centre of cloud-production – thunderstorms – the clouds that make other clouds. How precisely do they do it, and are thunderstorms changing? The I.C.E. scientists search for the answers.