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Inner Space Cavern
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== Tourist attraction == The cavern was opened to the public in 1966.<ref name="KDH" /> Three different levels of tours are available, ranging from a basic walking guided tour to an advanced wild cave [[Caving|spelunking]] tour, with over 1.2 miles of passage being open to the public. However, non-public passages are well-guarded and independent exploration is not allowed. Apart from the main entrance, which was created by [[dynamite]] blasts, a vertical borehole, located in the Inner Cathedral Room, serves as an emergency entryway/exit and a means for ventilating the cavern.
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