Stunning images captured by photographer Thomas Senf as climber Stephan Siegrist , 43 , scaled frozen waterfall . The Voringsfossen fall is liquid for most of the year , but in winter freezes into a 500ft cliff favoured by climbers . A group of friends from Germany were on holiday at Lake Tahoe, Nevada, when they decided to climb one of its many waterfalls.
Stunning images captured by photographer Thomas Senf as climber Stephan Siegrist , 43 , scaled frozen waterfall . The Voringsfossen fall is liquid for most of the year , but in winter freezes into a 500ft cliff favoured by climbers . Hundreds of adventurers attempt the climb by day , but very few attempt the ascent at night , as pictured here .