Speaking of mountain biking underground, Aaron Chase, Eric Porter, and Chris Van Dine were getting rad in Mexico recently, and built a blind drop into a sink hole in the ground. Check out how they went about building it, and what it looks like to drop into a pit in the earth:
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I know this is not the same thing but have you heard of this race?
http://www.minersrevenge.com/
And this site has map and video of this race….
http://trailgenius.com/trail-genius-map/miners-revenge-1st-lap?trail=0&view=NA&time=283&fb_source=message
O.K.
I have done some crazy stuff in my day, but this is just lunacy!