I don't want to sideline this topic, but here is an interesting article relating to the comments concerning Native Americans employed in high altitude jobs.
“A lot of people think Mohawks aren’t afraid of heights; that’s not true. We have as much fear as the next guy. The difference is that we deal with it better. We also have the experience of the old timers to follow and the responsibility to lead the younger guys. There’s pride in ‘walking iron.’” —Kyle Karonhiaktatie Beauvais (Mohawk, Kahnawake)
http://www.sites.si.edu/exhibitions/exh ... g/main.htm
"The Mohawk tradition of ironworking began in the mid-1880s when they were hired as unskilled laborers to build a bridge over the St. Lawrence River onto Mohawk land. They quickly earned a reputation for being top-notch workers on high steel, and “booming out” from their Native communities in search of the next big job became a fact of life."
BTW, thank you thespiffy for relinking the working videos! It's an awesome view into an incredible job!