A blissfully cool 10 degrees Celsius is the perfect temperature for scrambling down an old mine shaft vigorously and then sailing across the longest underground zipline in the world—so says Go Below Underground Adventures operations manager Mike Morris, from Wales.
Several days a week, he clips onto a safety wire and makes the 1,375-foot descent below the surface in an abandoned slate mine near Lake Level where he brings guests to stay in the world’s deepest underground hotel suites—which are all comfortably well-heated.
