Pygmy style suspended bridge

I found an old 1930s footage of African's Pygmy tribe building a bridge over crocodiles infested river. It is quite amazing.

If you never heard about the Pygmies: they are ancient primitive tribe and short in statue (about 3 to 4 ft tall), live deep in the jungle and survive by means of hunting/gathering. (The footage interestingly shows the Pygmies eating raw elephant meat they killed). They are currently endangered because their way of living is cut short by land clearing and development. They are being forced out of the jungle and struggle mightily in adjusting to modern lifestyle which is totally foreign concept for them, for instance the use of currency and employment.

The bridge was built using some kind of woody vines and suspended between two large trees stretching several hundred feet across the river. Apparently the vines were bundled together to create a much stronger rope, similar concept to making wire ropes we use for bridges. The bridge needed to be suspended high above the river since it would experience sagging as much as 20 feet.

The Pygmies are very brave and amazing engineers, building the bridge vine by vine high up above the river while the hungry crocodiles patiently waiting under for possible feast.

You can watch the footage at this link: http://www.youtube.com/watch?v=PYvaA0Lz70A&feature=related