Video: Wingsuit Pilots Go Subterranean in 'The Crack'

It seems that BASE jumpers and wingsuit pilots are always finding new ways to push themselves and their sport to its limits. In the case of this video, that means a team of fliers leaps from the top of a tall cliff in the Swiss Alps, then makes a controlled descent down a narrow, twisty canyon referred to as "The Crack." It is some scary stuff to watch unfold, but I'd much rather see it from the comfort of my own office than the way these guys are doing.