lea about ten expedings a year taking care of every dail from planting roots to rationing food andit supplie 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 disaster including s garret team doctor yves garalong. >> losing yves was f everyone, for her family and myself. is this something i shoul do? should i continue climbing? >> after serious soul-sea hing garrett ultimately returne