| 11. | Formed during the Quaternary, Prohodna is long, which makes it the longest cave passage in Bulgaria.
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| 12. | Bishop's map showed some 16 km of cave passages, half of which were discovered by him.
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| 13. | With more recent discoveries, the length of cave passage totals extending over a vertical range of about.
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| 14. | The classic trip, from the entrance to the Ice Plug by the shortest route, traverses of cave passage.
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| 15. | Roughly of cave passage is open to the public, one third of the total length of the cave.
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| 16. | Some cave passages may be marked with flagging tape or other indicators to show biologically, aesthetically, or archaeologically sensitive areas.
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| 17. | They explore the caves passages fruitlessly and emerge just as King Shih Hu and his Golden Girls catch up to them.
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| 18. | He spotted a horizontal hole 60 yards from the sinkhole and theorized that the two openings indicated cave passages between them.
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| 19. | The caves passages are a mix of large, old and dry tunnels, full of calcite deposits with narrow streamways and waterfalls.
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| 20. | Slovenian divers managed to swim through the siphon " Ledeni dihnik " and discovered over 200 m of new cave passages.
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