Mark Burkey Photography

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  Croesor Mine, North Wales

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  Marble Showers, Ogof Ffynnon Ddu, South Wales

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  Medusa's Children, Ogof Draenen, South Wales

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  2nd Pitch, Pwll Dwfn, South Wales

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  Twll Clogfaen, South Wales

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  Main Streamway, Ogof Ffynnon Ddu, South Wales

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  Straw Grotto, Ogof Craig A Ffynnon, South Wales

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  Croesor Mine, North Wales

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  Column Passage, Ogof Ffynnon Ddu, South Wales

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  Main Streamway, Ogof Ffynnon Ddu 1, South Wales

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  Gasoline Alley, Ogof Craig A Ffynnon, South Wales

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  5th Pitch, Pwll Dwfn, South Wales

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  Traverses, Ogof Ffynnon Ddu 3, South Wales

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  Marble Showers, Ogof Ffynnon Ddu, South Wales

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  Flooded Main Streamway, Ogof Ffynnon Ddu, South Wales

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  Ogof Twll Gwynt Oer, South Wales

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  The Courtesan, Agen Allwedd, South Wales

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  Cloud Chamber, Dan Yr Ogof, South Wales