I like both the books and the radio series in different ways.
That's Gaping Gill (http://en.wikipedia.org/wiki/Gaping_Gill) main chamber. I read the book in the nearby sand caverns where we stayed overnight. It was on a sponsored "24 hours underground" caving trip that we did to raise funds for Burnley Caving Club. An interesting experience but very poorly organised (by somebody who didn't even come on the trip with us) and raised hardly any money, so we didn't bother doing it again. Another failed fundraising bid was a sponsored "vertical mile" abseil off the roof of what was at the time the tallest building in Burnley (IIRC we wore out the rope and earned less than it cost to replace). Another time the chairman tried to organise a casino night which could potentially have lost the club a lot of money, but he got replaced at the AGM and the event didn't go ahead. Not that long afterwards several members broke away and formed a new club "for serious cavers," with the ousted chairman in charge (not such a great loss in hindsight). The only fund raising event we did that was remotely successful was a small fair with bouncy castle, aerial runway, coconut shy, etc.
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That's Gaping Gill (http://en.wikipedia.org/wiki/Gaping_Gill) main chamber. I read the book in the nearby sand caverns where we stayed overnight. It was on a sponsored "24 hours underground" caving trip that we did to raise funds for Burnley Caving Club. An interesting experience but very poorly organised (by somebody who didn't even come on the trip with us) and raised hardly any money, so we didn't bother doing it again. Another failed fundraising bid was a sponsored "vertical mile" abseil off the roof of what was at the time the tallest building in Burnley (IIRC we wore out the rope and earned less than it cost to replace). Another time the chairman tried to organise a casino night which could potentially have lost the club a lot of money, but he got replaced at the AGM and the event didn't go ahead. Not that long afterwards several members broke away and formed a new club "for serious cavers," with the ousted chairman in charge (not such a great loss in hindsight). The only fund raising event we did that was remotely successful was a small fair with bouncy castle, aerial runway, coconut shy, etc.