Russian extreme sports star Valery Rozov has performed the world's highest BASE jump - off the north face of Everest - to mark the 60th anniversary of Edmund Hillary's first ascent.br Script:br br Why climb a mountain?br br "Because it is there" - so goes the famous retort by legendary mountaineer George Mallory. br br So, why throw yourself off a mountain?br br It's a question that is seemingly yet to be posed to Russian extreme sports star Valery Rozov - but you would expect him to give a similar response. br br Rozov marked the 60th anniversary of the first ascent of Mount Everest by Edmund Hillary by hurling himself off the daunting north face in a death-defying BASE jump. br br The 48 year-old jumped from a height of 7,220-metres (23,687-feet) above sea level.br br Despite adverse weather conditions with temperatures 18 degrees below zero, Rozov landed successfully - and safely.br br It's the highest BASE jump ever completed.br br So, it's understandable that he was at least a little bit nervous.br br SOUNDBITE: (English) Valery Rozov, Russia: br "It was one of the (most) difficult jumps for me because of the high altitude and my personal physical feeling (which was) not the best of course. I was a little bit nervous that the vertical part at the beginning was short for this altitude."br br He spent more than two years preparing for the big jump, and about a minute to complete it. But the memory will surely last a lifetime.