The Earth was once entombed in sheets of ice miles deep, extinguishing nearly all life. Travel to the ends of the earth with intrepid scientists investigating the Snowball Earth event. Could this controversial theory be the key to the evolution of mankind on Earth? Deep in the Australian outback a smooth grey stone stands out in the parched red earth. The stone is over 630 million years old and proves that Australia used to be buried under ice. It's a tantalising sign of the global freeze that once enveloped every inch of this planet. In Alaska, a group of American scientists highlight the power, possibilities and history of this icy world. We climb the overhangs of the vast Matanuska glacier, cave deep into the ice crevasses of White Out and land on the smouldering summit of the Mt. Augustine volcano. However, it is back in South Australia that this ancient climate disaster reveals its most extraordinary twist. Stamped in the rugged rocks there is a vital clue - one of the world's first ever multi-cellular organisms. Only slightly older than the global freeze itself, is this fossil the crucial evidence that Snowball Earth created complex life on Earth?moreless
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