"Not only did the balloons spin the entire time, they also went up and down," he said. "At one point we were walking kind of downhill -- the next minute uphill. The tension of the line was going ...

"Friedi Kuehne and Lukas Irmler set a new world record by walking a slackline suspended between two hot air balloons at an altitude of 2,500 meters (8,202 feet), breaking the previous record of ...

"Not only did the balloons spin the entire time, they also went up and down," he said. "At one point we were walking kind of downhill -- the next minute uphill. The tension of the line was going ...