. > i'm a mountain guide st pediexon tiadle mountains in the world. >> garrett madison ownmadison mountaineeringalizes in guiding amateur adventure seekers up several of the world's most telephone rouse peaks. garrett lea about ten expedings a year taking care of every dail from planting roots to rationing food andit supplie. his job to lead his clients on their climbs and keep them safe from mother nature's wrath. >> there's avalanches, ice fall, crevasses and altitude on this, and all o t thesengs make it very dangerous. hch. >> much business is done here on mount everest where he takes a dozen clients a year. >> the first time it was incredible coming to the top and now coming back i enjoy helping other climbers realize their goal is a bucket list type thing, sething they've dreamed about for years and decades, maybe their whole life. >> but on the world's tallest peak anat exhilaring hike can turn into a deadly tragedy in no time. >> she was one of the first americans reported dead after a massarthquake caused an avalanche. >> in 2015, 18 people died on everest in a catastrophic avalanche di