Seven slack line walkers have broken the world record for the highest urban high-line, walking across a length of rope at over 1,000ft in Moscow. Athletes from Russia, Germany, France and Canada walked for 800ft at a nauseating height of 1,140ft - a hundred feet higher than London's Shard. Russia's Sergey Shakuto, 37, said: 'It was an almost impossible event, because in Russia it is incredibly difficult to get permissions ...