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Into the Unknown: Exploring New Mammoth Caves

Alexandra Cousteau ventures out of sight, deep into the cool world of New Mammoth Cave in Tennessee. Water can spread for miles and miles underground in the network of caves of this karst landscape making water contamination particularly difficult to trace. With the guidance of the Nature Conservancy's cave and karst specialist, Cory Holliday, Alexandra delves into the unseen ecosystem to find out more about the importance of this fascinating watershed beneath our feet.