For extreme athlete Mich Kemeter, nothing comes close to the freedom of free solo slack-lining. Having traveled the globe and taken on some of the world's highest lines without safety, Mich's now ready for a different challenge closer to home. He'll push the physical limits of his sport as he attempts a 250m world record waterline across the stunning Grüner See (Green Lake) in his hometown of Tragöß, Austria. At almost the length of two football fields Mich will have to utilize all of his combined physical and mental strength to overcome his greatest challenge yet.