Tim Mowrer made this video documenting the technique used to cross Batang Tebo in central Sumatra, Indonesia. One tethered man swims across and ties a rope, then gear and people cross while attached to that rope. Tim and his team have been researching various ways to improvise rope bridges across this dangerous river which floods to twice its normal size during the rainy season. They were influenced by this site about rope bridges. (Thanks, Alex!)