It has remained out of sight for an unknown length of time and has aquatic species living within that are believed to never have seen daylight. . https://www.heraldscotland.com/news/17278866.huge-cave-system-could-be-scotlands-longest-and-most-spectacular/
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Brian McGuireDecember 6, 20181 Mins read
Huge cave system ‘could be Scotland’s longest and most spectacular’
Brian McGuireDecember 6, 20181 Mins read 
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