Thanks for the insight. I wondered how that thing would have been drilled since it's 8 feet wide.
It is very true that no one will find you under ground. I explored Ubehebe TALC Mine in Death Valley and that was one of the most dangerous mines I ever climbed through. Down one hallway all the beams holding the back up were broken and in a V shape. I still climbed down through it though. Although the video on that adventure sucks here it is:
http://www.youtube.com/watch?v=UKMxV2zOIqg&feature=plcpNope I never considered mine engineering. Sounds like both a fun and challenging field. I left school far too long ago for me to consider anything requiring it.
