<p>In the summer of 2012, a team of six climbers set out to attempt the first ascent of one of the great unclimbed lines of the Himalaya - the giant Mazeno Ridge on Nanga Parbat, the world's ninth highest mountain. At ten kilometres in length, the Mazeno is the longest route to the summit of an 8,000-metre peak. Ten expeditions had tried and failed to climb this enormous ridge. Eleven days later two of the team, Sandy Allan and Rick Allen, both i...