This BBC NHU series sets out to examine the wildlife and some human stories of three great mountain ranges in the world – The Rockies, The Himalaya and the Andes. Climbing on camera once again were Ivan Calderon and Federico Pissani. Our objective – the Sphinx  one of the biggest granite-walls in the Peruvian Andes rising a sheer 850 metres and topping out at a lofty 5400m it was never going to be easy or technically straightforward to rig and film.