a british man has become the first person to walk the length of china's yangtze river — overcoming subzeros — and the 28—year—old's not even that keen on walking. at 6,400 kilometres, the yangtze is the world's third longest river and the longest in asia ash dyke began the journey at the river's source, more than 5,000m above sea level on the tibetan plateau. along the way, he crossed the famous three gorges, site of the world's largest hydroelectric dam and power station. the journey took him 352 days to reach the sea at china's largest city, shanghai. and when ash joined us from shanghai, he told us what motivated him to make such an extraordinaryjourney. so this is my profession, i've been doing this for the past ten years, and i've always been fascinated with china and wanted... it was pretty much the biggest thing i could find that hadn't yet been done, from west to east of the country as well, so i was just hooked instantly. tell us about some of the tough moments that you faced during that walk. yeah, so, really tough was actually the people that were joining me along the way. we ha