A caver explores a passage in Town Drain Cave in the Neath Valley of South Wales in the Brecon Beacons National Park

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Photo credit: © Anthony Baker / Alamy / Afripics
License: Licensed
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Keywords: adventure, backlight, beacons, black, brecon, cave, caver, cavern, caving, dark, darkness, exploration, explore, explorer, extreme, light, limestone, national, park, rock, silhouette, solo, speleologist, speleology, spelunker, spelunking, sport, wales