Base Camp, and his equipment was transported by yak train to the Advance Base Camp, as part of the Asian Trekking "basic services" package. Sharp remained there for five days to acclimatise to the altitude. He made several trips up and down the mountain to set up and stock his upper camps and further acclimatise himself. Sharp likely set out from a camp high on the mountain below the Northeast Ridge to make a summit attempt during the late evening of May 13. He needed to climb what is referred to as the "Exit Cracks", traverse the Northeast Ridge, including the Three Steps, reach the summit, then climb down to return to his high camp. It was reported that Sharp carried a limited supply of supplementary oxygen with him, which he intended to use only in an emergency. Sharp either managed to reach the summit or turned back near the summit to descend very late in the day on May 14. In the end, he was forced to bivouac on the mountain during his descent in the dark at about under a rocky overhang known as Green Boots' Cave situated near the so-called First Step. There he was overcome by the elements, without any remaining supplementary oxygen, possibly experiencing equipment problems, and likely also suffering from some degree of altitude sickness due to a lack of oxygen, all on one of the coldest nights of the season. Sharp's predicament was not immediately known for several reasons: he was not climbing with an expedition that would monitor climbers' locations; he had not told anyone beforehand of his summit attempt (although other climbers spotted him on his ascent); he did not have a radio or satellite phone with him to let anyone know where he was or that he was in trouble and two other more inexperienced climbers from his group went missing at around the same time. One of the two missing climbers was Malaysian Ravi Chandran, who was eventually found but required medical attention after getting frostbite. Some members of the group of climbers Sharp was with, including George Dijmarescu, realised Sharp was missing when he did not return later in the evening on May 15 and nobody reported seeing him. Sharp was an experienced climber who had previously turned around when he had experienced problems and it was surmised that Sharp had sought shelter at one of the higher