Skydivers are pretty fearless. I mean, what is left to be scared of after falling toward the Earth from insane heights. So naturally, skydivers are looking for new cool stuff to do up there. Like swing on a giant swing suspended between two hot air balloons. This stunt, courtesy of Red Bull, took four skydivers, two hot air balloons, a 400 foot-long rope with a seat on the end, and a climb to about 6,000 feet in a hot air balloon.