Caving can be a challenge, crawling through tight passages, climbing up walls of mud and traversing gaps in the rock. These images show cavers in OFD, Brecon, South Wales.
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Neil Montgomery clinging onto 'Poached Egg', so called because if you fall off - that's what you'll look like...
Nick Moulton negotiating 'the Cork Screw'
Andrew Hammond climbing up the 'The Cork Screw'