The Pennine range runs like a spine through the English Midlands. At Peak Cavern, which lies at its southern end, eight experienced "potholers," under the auspices of Britain's Speleological Association, last week began the exploration of a newly discovered underground passage. They first worked their way in by a series of up and down scrambles, then wriggled through a narrow tunnel with a mud floor and a roof that was sometimes no more than 10 in. above their heads. It took them two hours to progress 600 ft. The tunnel suddenly broadened into a fairly large chamber 1,000 ft....
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