article_snippet:  a relatively safe sport' $$$$ plunges 586ft underground - twice the height of the Statue of Liberty - and the interior has been described as 'pitch black'.
article_snippet: Scroll down for video .
article_snippet: Amy, 28, from Huntsville, Alabama, said: 'I've been doing this for quite a few years now so the depth doesn't bother me as much. '
article_snippet: I just think to myself 'yes, that's a deep pitch-black hole in the floor'.