Sinkholes: Swallowed Alive

National Geographic Channel +1

1:00 AM to 2:00 AM

Sunday 4 January

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The facts about the natural phenomena, which have made headlines as massive sinkholes have appeared at home and abroad, swallowing cars, buildings and, in one case, almost burying a woman alive when she fell down a hole in her garden. This documentary breaks down the science of these terrifying freaks of nature