High altitude adaptation

High-altitude acclimatization was the gradual adjustment that allowed climbers to work at increasing elevations before attempting the summit. In the 1996 expedition, it was both a physiological process and an operational plan: Mountain Madness scheduled successive climbs and rests, while Anatoli Boukreev judged readiness person by person. The plan offered a measured route upward, but changing conditions, uneven responses, and decisions to keep climbers moving made acclimatization impossible to treat as a timetable alone.

The staged plan

The expedition’s approach began with several days at Base Camp, giving climbers time to adjust before ascending to higher camps. The underlying method was progressive: climb higher in stages, then return to an altitude already experienced, so that the body could adapt before a summit bid carried it into the highest elevations. Rather than asking clients to shoulder expedition loads, the first excursion limited them to personal belongings and equipment. The climbing Sherpas, working under Lopsang Jangbu Sherpa, carried rope and supplies, conserving the clients’ strength for the climbing and adaptation ahead.

The first excursion was to 6,100 meters, the site selected for Camp I. The team intended to return to Base Camp that same day rather than make the first ascent an overnight test. Rest afterward served two purposes: it allowed the climbers to recover and gave the guides time to observe their condition. The second excursion was to revisit Camp I, spend the night there, and climb the following day to 6,500 meters, where the Sherpas would establish Camp II, also described as the Advance Base Camp. The clients would descend rather than sleep at that higher point, then take several days of rest. Camp II was intended to function as a smaller, equipped base, with a mess tent, cooking facilities, and shared sleeping tents for overnight stays.

The plan was therefore not simply a sequence of altitude records. Its rhythm of ascent, observation, descent, and recovery was meant to make the later summit push more manageable. But its success depended on more than the itinerary: the Sherpas’ work, the weather, the condition of individual climbers, and the expedition’s ability to preserve time for rest all affected whether the intended stages could be completed.

Adaptation varies by climber

Boukreev emphasized that acclimatization could not be governed by a rigid calendar, because it depended on circumstances and individual physiology. By the end of April, members of the team were spread across the mountain and at Pheriche, where Tim Madsen and Charlotte Fox had gone to recover from acute mountain sickness symptoms. The geographic spread did not, in itself, alarm him. The more pressing issue was the difference in readiness among the Mountain Madness climbers, alongside Scott Fischer’s repeatedly interrupted routine of moving up and down the mountain.

At Camp III, Boukreev’s assessments turned the general principle into specific decisions. On April 28, Lene Gammelgaard had red, inflamed eyes and seemed lethargic, though her difficulties appeared minor at that point. Dale Kruse concerned him more. Boukreev watched him closely and saw him as apathetic, withdrawn, and distant. He urged the climbers to descend rather than extend their stay, especially because Kruse’s condition seemed to be worsening. When Kruse finally prepared to leave, he was unsteady and had trouble standing. Boukreev feared that a fall could become a crisis, since Kruse was considerably larger than he was and might be difficult to get safely down to Camp II. Boukreev descended with Kruse and Gammelgaard the next day, keeping control of Kruse’s movements for much of the route, particularly through the Khumbu Icefall. The episode demonstrates why readiness had to be judged through observable changes, not merely by counting nights at altitude.

Boukreev also argued that a night at Camp III could be enough for a first-time visitor to that elevation. He discouraged Gammelgaard and Sandy Hill Pittman from staying another night, proposing instead that they climb to 7,500 or 7,600 meters and then descend to Camp II. Neither wanted to climb higher that morning. The disagreement illustrates that acclimatization involved not only the body’s response but also a climber’s appetite for further ascent and the guide’s judgment about whether ambition was being mistaken for readiness.

Oxygen, experience, and the summit push

The competing demands of acclimatization and summit ambition became especially visible in the discussion over supplemental oxygen. Gammelgaard still intended to climb without oxygen, but Boukreev believed she lacked both the experience to assess her physiology and the acclimatization required to make that choice safely. He explained that his own first oxygen-free ascent of Everest in 1991 had followed extensive preparation, including a night at the South Col before he descended to Base Camp. Since Gammelgaard had not gone higher than 7,300 meters on this expedition, he urged her to abandon her plan for the coming attempt. He offered to climb with her without oxygen on a later effort if she first succeeded with oxygen. His proposal connected an immediate safety decision to a possible future attempt instead of treating her ambition as something that had to be satisfied at once.

The same question of readiness shaped the treatment of Fox and Madsen. They had broken the planned acclimatization routine and had not spent a night at Camp III, yet Fischer intended to let them ascend. Boukreev expected Fischer to assess them more closely at Camp II, while warning that climbers on a final push often developed coughs, headaches, or intestinal problems and could be poor judges of their own condition. If a climber concealed a problem, the danger extended beyond that person to others on the route. Fox and Madsen had, in fact, voiced concern about attempting the summit without proper acclimatization. They were told that the expedition would make only one summit attempt, a restriction that made waiting for greater readiness difficult: the opportunity to recover and try later was not available to them as part of the plan.

The oxygen arrangements underscored how closely preparation and timing were bound together. At Camp IV, Mountain Madness had sixty-two canisters: nine heavier Zvesda bottles reserved for sleeping before the attempt and fifty-three lighter Poisk canisters intended for the May 10 climb. Only 51 percent by volume of the oxygen purchased from Henry Todd was on hand for the summit bid; most of the remainder had already been used, particularly by Pete Schoening and Ngawang Topche Sherpa, while a small quantity was kept at Base Camp for medical emergencies. The Sherpas carried twenty-one bottles up the mountain, while the guides and clients carried seventeen between them. In all, thirty-eight Poisk canisters went upward, leaving fifteen full ones at Camp IV, along with whatever remained from the Zvesda bottles. That reserve was too small to support an overnight delay and a second attempt on May 11. Readiness was therefore being tested inside a narrow window, with little capacity to compensate for complications by resting and trying again.

Disrupted routines and mounting risk

Even before the final push, Boukreev’s concern extended beyond the clients’ physical condition to the expedition’s ability to follow its intended preparation. The weather had been unstable for several days, with strong winds at higher elevations. Boukreev felt that conditions were wrong and wanted his concerns heard, but he believed Fischer did not give his advice the same authority he gave Rob Hall’s. His earlier proposal to take clients down to the forest zone for rest had not been accepted. Rather than argue, Boukreev tried to play down his intuitions. The episode sets a guide’s assessment of conditions against the pressure to keep the expedition advancing: the need for recovery was recognized, but did not automatically determine the plan.

The work required to prepare the route also competed with rest and acclimatization. When Camp III remained unfinished and Sherpas neared exhaustion after several consecutive days of work, Boukreev proposed that four of them establish the camp and then descend to recover. But an agreement among Fischer, Hall, Todd Burleson, Ian Woodall, and Makalu Gau called for the expeditions to cooperate in fixing ropes between Camps III and IV on April 26. Mountain Madness had expected to send Sherpas rather than guides. Sending its Sherpas to Camp III and then down to rest would leave none available for the shared rope-fixing effort, and the team risked losing its position among the early summit attempts if it did not contribute. Boukreev was assigned to work in their place. He welcomed the chance to help make the route ready, but the assignment required his own rest day; he planned to spend the following day at Camp II recovering and collecting supplies from the other expeditions.

The same pattern of mismatch between expectation and execution appeared higher on the route. The climbers understood that Sherpas from the Fischer and Hall expeditions would leave Camp IV ahead of the clients to fix ropes, so that the ascending teams would not have to wait. In fact, neither Lopsang Jangbu Sherpa, Ang Dorje Sherpa, nor other Sherpas had gone ahead. Lopsang later said that a member of a Montenegrin expedition had told him the ropes were already fixed, while Jon Krakauer questioned that account, noting that Lopsang and Ang Dorje carried rope. The disagreement over what had been understood or communicated does not erase its practical consequence: the expected preparation was not in place, and the climbers encountered an additional obstacle during their ascent.

From adaptation to exposure

For Boukreev, acclimatization informed decisions throughout the climb, but could not guarantee safety once the team entered the summit attempt. His agreement with Fischer before the expedition was that, if properly conditioned and acclimatized, Boukreev would guide without oxygen. Fischer planned for each client to have three canisters, or about eighteen hours of oxygen, for a midnight departure on May 10 and a return by 6:00 P.M. The schedule was supposed to bring the climbers back before darkness and before their oxygen ran out. If the return was delayed, Fischer expected Boukreev to assist descending climbers with oxygen, hot drinks, or physical help. This arrangement assigned the oxygen-free guide a rescue role, but it relied on the clients’ ability to complete the climb within the planned period.

In practice, preparation was strained by uneven acclimatization, interrupted routines, unsettled weather, limited oxygen reserves, and failures of coordination. At the Balcony, climbers from three expeditions crowded together to change canisters and recover. Martin Adams described the shift in mental capacity at that altitude as movement from barely being able to think to being unable to think at all. Above Camp IV, physiological adaptation had to contend with cold and oxygen deprivation in the Death Zone. The high-altitude plan had been designed to reduce that exposure by stages, but the summit schedule narrowed the room for delays. Acclimatization thus emerges not as a guarantee that a climber was ready, but as a fragile preparation whose value depended on whether the expedition could respect differences in condition and preserve the means to respond when the mountain disrupted its timetable.