In June of 1967 10 people headed into the Mossdale Caverns, a cave system known for being dangerous and unexplored. These caver's mission was to explore unmapped passages and reveal new caving systems. When thunderstorms and torrential down pours suddenly flood the tunnels, the largest rescue mission in Britain's history ensues.

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Sources:
Micheal Melvin, Independent, Yorkshire Dales National Park, Youtube