This stone passage is six feet in diameter, filled with cracks and

gaping holes. Occasionally a chunk of rock falls from above or rolls

towards you from further down the tunnel. Because of this footing is

not easy, and at times the ground rumbles with such force that it

would seem as though a massive boulder were about to appear and

crush you, when instead it is a mere pebble. A serrated hole in the

ceiling allows for passage into a tunnel above.