A daredevil sportsman plunged off a 900m cliff - higher than the world's tallest building - with nothing more than an inflatable KITE to break his fall. Fearless Marek Zach, 34, is a kite-surfing champion and usually uses his 14 metre-wide canopy to glide above waves or snow for around ten seconds at a time.But the father-of-one is claiming he became the first person to complete an extreme jump with just a flimsy windbreak after his stunning leap off a mountain in Turkey.Holidaymakers gasped as he flung himself into the air and battled with competing winds and sharp rocks which could easily have snapped his strings.