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'''Everest base Camp'''
At Everest Base Camp, climbers will often spend 4 - 8 weeks, acclimatizing to the altitude. During that time, the "Icefall Doctors" will set up ropes and ladders in the notoriously unstable Khumbu Icefall. Seracs, crevasses and shifting blocks of ice make the icefall one of the most dangerous sections of the route. Many climbers and Sherpas have been killed in this section. To reduce the risk, climbers will usually begin their ascent well before sunrise when the freezing temperatures glue ice blocks in place. Above the icefall is Camp I at 6,065 m (19,900 ft) Camp 1 is mostly a temporary camp with most climbers just spending one night at this camp.
From ABC, climbers ascend the Lhotse face on set ropes up to Camp III, situated on small ledges at approximately 7,200 m to 7,400 m. From there, it is another 500 metres to Camp IV on the South Col at 7,920 m (26,000 ft). From Camp III to Camp IV, mountaineers are faced with two additional obstacles: The “Geneva Spur” and The “Yellow Band”. The Geneva Spur is an anvil shaped rib of black rock named by a 1952 Swiss expedition. Fixed ropes help climbers in scrambling over this snow covered rock band. The Yellow Band is a section of sedimentary sandstone. The route from the base of the Lhotse face to the Summit is almost always completely fixed with static line.
On the South Col, climbers are very close to 8,000 m and can only spend limited time at those altitudes even with supplemental oxygen. Climbers typically only have a maximum of two or three days they can tolerate at this altitude for making peak bids. Clear weather and low winds are important factors when deciding on a summit attempt. If weather does not cooperate within these short few days, climbers are forced to move down, many all the way back down to Base Camp.
From Camp IV, mountaineers will start their summit push from 8 pm to 2 am with the hope of reaching the summit (still another 1,000 metres above) within 10 to 12 hours. Climbers will first reach "The Balcony" at 8,400 m (27,700 ft), a small platform where they can rest and gaze at peaks to the south and east in the early dawn light. Continuing up the ridge, climbers are then faced with a series of impressive rock steps which usually forces them to the east into waist deep snow, a grave sudden large amount hazard. At 8,750 m (28,700 ft), a small table-sized arena of ice and snow marks the South Summit.