This weekend sees the end of the winch meet for the Craven Pothole Club at Gaping Gill, Yorkshire most impressive underground attraction.

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Gaping Gill's main chamber (above) during this year's August bank holiday winch meet. The main shaft is top centre, with the Rat and Mouse waterfalls entering on the left. The floor is littered with small rocks and muddy clay. The cavern regularly floods to a depth of 60 feet.

Grough abandoned the daylight for a trip into this subterranean world. Read the full story here