A DAREDEVIL climber has smashed a ‘waterlining’ world record – tiptoeing an incredible 250m along a slack line above a beautiful mirrored lake. Extreme sports champion Mich Kemeter, 25, walked the length of almost THREE football pitches to complete the energy-sapping challenge. It took the Austrian almost 20 attempts – and several falls – over 20 days to break his own record at the Green Lake in Tragoess, Austria.