![Slackliners take part in Highline Extreme event in Switzerland(1/4)](http://www.ecns.cn/hd/2017/09/18/57f64a8bb28842049973f3635cbd157b.jpg)
A slackliner walks on the line during the Highline Extreme event in Moleson peak, western Switzerland on September 15, 2017. In the event, world’s fifty best slackliners compete on six different lines ranging from 45 meters to 304 meters. (Photo/Agencies)