Over the years at 60 Minutes, we've been in more than a few tunnels. We explored Mexican drug lord El Chapo's subterranean escape routes, burrowed through a Roman villa buried by Mt. Vesuvius and traveled the depths of the New York City subway. But nothing prepared us for a place called Moab Khotsong, a South African gold mine that extends nearly two miles beneath the surface. In their pursuit of gold, South Africans have dug the deepest holes on Earth. The country was the world's top gold producer for decades.
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