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Dinas Rock Silica Mine. the beginning of the flooded section. South Wales, UK'The Columns' Ogof Ffynnon Ddu cave, South Wales, UK'The Columns' Ogof Ffynnon Ddu cave, South Wales, UKWinch mechanism. Dinas Rock Silica Mine. South Wales, UKDinas Rock Silica Mine. the beginning of the flooded section. South Wales, UKA caver explores railway tracks. An incline on the right descends deeper into the Dinas Rock Mine.Dinas Rock Silica Mine. the beginning of the flooded section. South Wales, UKDinas Rock Silica Mine. Large chamber supported by rock pillars. South Wales, UKDinas Rock Silica Mine. the beginning of the flooded section. South Wales, UKRailway tracks and an incline going deeper into the Dinas Rock Silica Mine, South Wales, UK"Car graveyard" Gaewern Slate Mine, Wales, UKPorth Yr Ogof cave, Brecon, Wales, UK"The Nave" in Ogof Ffynnon Ddu cave, South Wales, UK"The Nave" in Ogof Ffynnon Ddu cave, South Wales, UK"The Nave" in Ogof Ffynnon Ddu cave, South Wales, UK