They Called Sherpas "Overpaid Mules". They Were Found Dead After.

[00:00:00]Welcome back to the last climb. I'm Alex. Today I'll go over two affluent climbers who arrived on Everest.

[00:00:06]Treating experienced high altitude workers as hired labor. Showing open contempt from the start. Convinced their money and fitness would carry them through. They dismissed guidance, ignored warnings, and leaned on attitude over a climatization. What followed was a slow collapse of judgment in one of the harshest environments on Earth.

[00:00:27]It was the 18th of May, 2016. On the south side of Mount Everest in Nepal's Kumbu region, hundreds of climbers were preparing for summit attempts during one of the busiest weeks of the spring climbing season. Serene Gamboa, 47, from Newport Beach, California, owned a successful chain of boutique fitness studios and carefully cultivated an image of discipline, ambition, and physical achievement. A frequent user of social media, she regularly documented endurance events, mountain expeditions, and personal milestones, viewing Everest as the ultimate accomplishment in a long series of increasingly ambitious challenges. The ascent of Mount Everest was not merely a personal goal, but was strategically envisioned as the ultimate capstone to these accomplishments. a monumental personal triumph that she anticipated would significantly amplify her public profile and enhance her personal brand. While she possessed a respectable resume of guided mountain ascents, including several notable peaks in the Andes and the European Alps, she had never before endured an extended period at altitudes surpassing 23,000 ft. Those earlier climbs still didn't really compare to what that altitude does to people, no matter how fit they are. Her training was intense. Lots of conditioning work, endurance sessions, and top-end gear prep. But not as much attention went into what really happens to the body at extreme altitude, or how complicated a big expedition like this actually gets once you're in it. She was more focused on how the achievement would look from the outside than what the climb would actually demand. Because of that, she kind of underestimated how altitude slowly wears you down and why acclimatization actually matters so much more up there. Leland Koreah, 51, a luxury real estate agent from Plano, Texas, joined the expedition alongside Serene after completing several guided clims together. Years of climbing on premium guided trips had led Leland to view high altitude support as a service that could be purchased, fostering an expectation that expedition staff would provide constant assistance regardless of conditions or circumstances. [music] From the earliest stages of the expedition, beginning with the trek through the Kumbu Valley to base camp and continuing through acclimatization rotations to higher camps, both women repeatedly voiced frequent, often [music] aggressive complaints toward expedition staff. Their criticism was directed most consistently at the Sherpas, the high alitude workers responsible for carrying loads, building and maintaining camps, and monitoring climbers safety. Multiple climbers and guides overheard them, referring to Sherpas as overpaid mules while dismissing safety protocols and technical expertise as unnecessary formalities. This behavior created growing tension within the group with the Sherpas continuing their duties professionally but gradually limiting interactions to essential tasks only.

[00:03:19][music] Over time, that distance stopped being just social. After repeated hostility and dismissive exchanges, staff began scaling back more than just conversation. They stopped offering the usual informal guidance and limited themselves to only essential checks. Not out of spite, but because every attempt to engage was met with push back. And at altitude, that kind of friction changes how much energy people are willing to spend. It turned into a quieter, more hands-off way of working with them, especially compared to other teams who still accepted routine feedback and monitoring. They weren't really part of the rhythm of that group anymore. Not in the small talks, not in the quiet checks, not in the way people naturally keep an eye on each other up there. And once that disappears, it doesn't really come back the same way. Normally, Sherpa staff conduct informal but frequent condition checks during movement between camps, observing oxygen usage, gate stability, and hydration patterns during routine transitions. As communication deteriorated, these passive monitoring points became less consistent, particularly during non-essential stops where the women declined engagement.

[00:04:29]Over time, this reduced the number of observational touch points available to detect early signs of altitude related decline before they became operationally critical. The expedition followed the south coal route on Mount Everest during the crowded 2016 spring season when limited weather windows led to heavy congestion along key sections of the climb. Camp 4, located at roughly 26,000 ft, sat within the death zone, where temperatures routinely dropped to between -20° F and -30° F, and winds frequently reached 20 to 40 mph. In this environment, survival depended entirely on supplemental oxygen, strict health monitoring, and close coordination with guides and sherpas, as even minor errors could rapidly become life-threatening.

[00:05:16]In the days leading up to the summit attempt, Sherpas kept noticing a pattern with both women that was hard to ignore.

[00:05:22]They'd brush off pacing advice, skip hydration rules, and even turn down basic oxygen saturation checks. Anytime staff tried to step in or slow them down, it was usually met with dismissal or irritation. Over time, that made it harder for the team to actually read how they were doing in real time, and it chipped away at the usual safety net climbers rely on up there. During this period, there were a few clear signs that their bodies were under strain, but they weren't always fully tracked because monitoring kept getting turned down or cut short. Oxygen saturation checks, for example, were sometimes refused or stopped halfway, [music] which meant the team couldn't really build a clear picture of how their condition was changing over time.

[00:06:03]Hydration also started to slip compared to what's normally expected on rotations like this. They weren't taking in enough fluids during long climbing stretches, which at that altitude adds up fast and [music] makes fatigue hit harder. On top of that, their pacing wasn't very consistent during the up and down acclimatization climbs. Put together, it meant the usual early warning signs were kind of scattered and incomplete, making it harder for the staff to notice how quickly things were starting to shift.

[00:06:31]The expedition's early progression through base camp, camp 1, camp 2, and camp 3 unfolded without major logistical issues, though interpersonal tension steadily increased. During acclimization rotations, [music] Serene repeatedly removed her pulse oximter before scheduled checks and dismissed the need for routine monitoring, often implying her fitness made such procedures unnecessary. Leland, meanwhile, skipped several hydration and safety briefings, relying on prior guided climb experience at lower altitudes [music] and viewing the instructions as irrelevant. She treated it more like repetition than instruction, like he'd already done enough versions on it before. Both women frequently rejected condition checks and displayed irritation when approached by staff, reinforcing a pattern of limited interaction that reduced the Sherpa's ability to monitor their condition effectively. At camp 3, the decline shifted from general fatigue into measurable operational impairment.

[00:07:32]Oxygen delivery required increasingly frequent manual adjustments to maintain stable flow with occasional inconsistencies during regulator handling and mask receding. Inside the tent, routine actions such as gear, organization, and hydration became noticeably fragmented with repeated pauses between simple tasks that had previously been automatic. Sherpa observations recorded delayed responses to direct prompts and reduced situational awareness during brief exchanges, indicating that cognitive and motor efficiency were beginning to degrade under sustained hypoxic [music] stress. While no single observation met formal emergency criteria, the combined pattern marked a clear [music] transition from early stage altitude strain into progressive functional compromise requiring heightened monitoring across earlier acclimatization rotations leading into camp 3. A notable shift occurred when standard oxygen saturation readings could not be completed on schedule due to repeated refusal and early [music] termination of monitoring. There was a stretch where nobody had clean numbers on them anymore. No clear readings, no steady baseline, just fragments. And fragments don't tell you much at altitude. They just leave space for guessing. While neither climber reported acute distress at the time, the lack of continuous reference data increasingly limited staff capacity to distinguish between normal highaltitude fatigue and [music] early stage hypoxic deterioration in later observations. On May 20, Serene and Leland left [music] Camp 4 summit push. The weather was supposed to give them a short break, a small window of calmer [music] conditions, but once they got moving, it was clear things were worse than expected. The wind hit harder and the cold felt sharper than forecast, making every step up there feel like a grind.

[00:09:20][music] They also moved slower than planned, which on Everest isn't just a timing issue. It actually starts eating into everything else. Because of that slower pace, they burn through their supplemental oxygen a lot faster than they should [music] have. And up there, that's one of the few things you really can't afford to mismanage. They were compelled to take several unscheduled rest stops, often pausing for extended periods, which further exacerbated the delays and increased their prolonged exposure to the extreme cold, wind, [music] and reduced atmospheric pressure. Each stop drained more of their dwindling energy reserves, pushing them closer to the brink of exhaustion and hypothermia. They eventually reached the summit late in the morning, hours beyond the preferred turnaround time.

[00:09:59]This turnaround time is a universally recognized and crucial safety guideline in high altitude mountaineering established to ensure climbers have sufficient daylight hours and adequate energy reserves for a safe and controlled descent. People usually don't argue with turnaround time up there.

[00:10:15]They just listen to it. Then they don't.

[00:10:19]Exceeding it significantly amplifies the inherent risks of extreme exhaustion, severe frostbite, and becoming caught in rapidly deteriorating weather conditions, which are common at these altitudes. The sun was already beginning its descent when they finally began their own perilous journey back down with the mountains shadows lengthening.

[00:10:37][music] During their subsequent descent, a phase of the climb often considered more hazardous and demanding than the ascent itself. Multiple climbers who were also descending observed both women moving with pronounced sluggishness, [music] exhibiting signs of profound fatigue and appearing visibly disoriented, their steps were hesitant, their balance precarious, and their movements lacked the precision required for safe navigation on the treacherous terrain.

[00:11:01]Witnesses later recounted seeing them stop frequently near the fixed ropes, often appearing to hesitate, struggle with simple movements, or exhibit a lack of coordination. While other teams driven by the urgency of the descent and the approaching evening continued their progress towards the lower camps with greater speed and purpose. As evening approached, the already challenging conditions were further compounded by rapidly deteriorating weather.

[00:11:26]Visibility was significantly reduced by swirling [music] snow, increasing cloud cover, and the onset of darkness, making navigation even more challenging and increasing the risk of missteps, falls, or becoming lost. The pair finally reached camp 4 considerably later than the vast majority of other climbers, many of whom had already been resting for several hours, recovering from their own summit pushes. The camp was largely quiet, with most climbers already inside their tents, unaware of the two women's delayed and difficult return and the silent struggle they had endured. By then, the camp had already moved on from the summit push. They were still catching up to it. Upon their arrival at Camp 4, a critical moment for reassessment, rehydration, and recovery, their behavior remained consistent with their established pattern of self-reliance and resistance to external intervention. Unlike many clients who, after a grueling summit day, actively sought assistance, [music] reported their condition, or requested medical checks from the expedition staff, both women immediately retreated into their tent. They didn't really talk to any of the remaining staff or other climbers.

[00:12:32]And when people checked in on them or asked how they were doing, there was just no response. After that, nobody around camp actually saw them again that night. Not the nearby teams, no one.

[00:12:44]They stayed in that same pattern of keeping to themselves, which just continued what they'd been doing earlier in the climb, avoiding check-ins and turning down wellness monitoring.

[00:12:52]Because of that, no one really had a clear read on how they were doing when it actually mattered, and any chance for early intervention kind of slipped past.

[00:12:59]As the evening went on, camp 4 slowly settled down the way it usually does after a summit day. People zipped into tents, conversations faded, and the noise dropped off piece by piece until it was mostly just wind outside. Serene and Leland ended up on their own in that quiet stretch inside their tent with no one really noticing what was happening in real time. Right after getting back in, they went through the usual postsummit routine, but even simple stuff looked harder than it should have.

[00:13:26]taking off gear, sorting oxygen setups, checking bottles. It all took longer with pauses in between like they had to stop and reset just to get through each step. Neither of them reached out to Sherpa staff during the usual evening rounds at Camp 4. And even when there were chances to check in or ask for help, they just didn't. No calls for assistance, no condition updates, nothing at all. Early indicators of decline were subtle, but consistent with high altitude fatigue. Movements were slower than earlier in the day, and responses to external presence near the tent were delayed or absent. Hydration intake appeared minimal, and equipment organization became increasingly disordered, suggesting early impairment rather than mechanical failure or external disruption. By midnight, conditions inside the tent had shifted into a more critical phase of physiological decline. Inside the tent, things stop being smooth. Adjust, check, readjust again. Nothing holds steady for long enough to feel controlled. Nothing holds steady for long enough to feel controlled. One or more instances of improper or incomplete connection of oxygen equipment likely reduced effective supply for an unknown period, compounding the effects of altitude exposure and further reducing overall ventilatory efficiency. A system that should have been automatic wasn't anymore. Small pauses started stretching out. Fixes didn't stick. and every correction just bought a little less time than the one before. These disruptions coincided with increasing difficulty maintaining correct mask placement and regulator alignment, suggesting a shift from fatigue related impairment into progressive oxygen delivery instability rather than isolated mechanical error. Shortly afterward, attempts to self-correct equipment placement became less consistent with delayed recognition of dislodgements and repeated reattempts that failed to restore stable oxygen delivery. Simple steps stopped staying complete. Things that were just done needed to be done again and sometimes again after that. This indicated a diminishing capacity for task execution under sustained hypoxic stress. Despite worsening internal conditions, no external intervention occurred during this period, consistent with established reports that the tent remained unresponsive to routine checks. In the later overnight hours, physical evidence indicates a progression into severe hypoxic impairment, affecting both coordination and judgment. Oxygen delivery systems showed signs of repeated handling without proper stabilization, and several components were found partially displaced from their intended configuration. It turned into the same actions, looping without resolution. Same hands, same gear, same outcome not changing, just motion without progress. Environmental conditions outside remained stable, but inside the tent, deterioration continued, [music] uninterrupted. The pattern of behavior suggests escalating confusion and reduced awareness of both time and condition, consistent with advanced altitude related neurological strain. Evidence meticulously reconstructed after the incident, drawing from a comprehensive analysis of witness accounts, detailed examination of their equipment, and forensic assessment of the scene, indicated that both Serene and Leland arrived at Camp 4 [music] suffering from severe exhaustion, significant dehydration, and advanced altitude related impairment. Their oxygen use during the long summit push ended up being a lot higher than planned, mostly because of how slow and draining the climb became. By the time they made it back, there wasn't much left to work with. Investigators later found one bottle was basically down to just traces of gas, and the other didn't really have the kind of backup supply you'd normally want for spending a night up there. The margin for error, already razor thin in the death zone, had been severely diminished by these factors, creating a precarious situation where their survival depended on external intervention they had actively discouraged. Under normal expedition protocols and established safety procedures, Sherpas routinely moved through camp 4 throughout the evening and early morning hours, conducting welfare checks on many climbers. This was particularly true for those who had shown signs of distress during the day or had experienced a particularly difficult or delayed summit. Even at that altitude, there's a rhythm to how people look out for each other. Several staff later said the same thing during the investigation. Over the weeks leading up to this, Serene and Leland had made it pretty clear they didn't want extra attention. They kept pushing back on wellness checks and would usually say they only wanted help if they asked for it directly. Because of that, the sherpas and guides kind of took them at their word. It wasn't personal. They were just trying to respect what they were being told. And up there, communication norms matter a lot. And up there, communication norms matter a lot. So, when the camp got busier and other climbers started showing clear symptoms or asking for assistance, attention naturally shifted toward those cases first. Looking back, that created a quiet gap around them.

[00:18:25]Not something obvious in the moment, but enough that fewer informal check-ins happened when things might have still been reversible. By the time conditions started deteriorating inside the tent that night, there just wasn't anyone immediately close by to notice the change in real time. Sometime during the night, both women's altitude sickness escalated fairly quickly. When investigators later went through the tent, they found clear signs that they had been trying to adjust their oxygen masks and regulators more than once. It wasn't clean or coordinated, more like repeated, slightly panicked attempts that didn't fully resolve anything.

[00:18:59]Things were being handled, rechecked, and adjusted again, but without the steady control needed to actually stabilize the situation. One oxygen regulator was found partly detached from its bottle, which suggested things inside the tent had gotten pretty difficult to manage. small precise movements just weren't coming together the way they normally would. And even basic equipment handling seemed off.

[00:19:23]Nearby, there was an empty water bottle and a few unopened medication packets still sitting there, including dexamethasone and nephipine, the kinds of drugs typically used for severe altitude related brain and lung swelling. This suggested a desperate but ultimately disorganized and ineffective effort to self-administer necessary care severely hampered by their rapidly deteriorating cognitive and physical condition. By early morning, neither woman emerged from their tent despite the increasing activity and preparations for descending teams beginning across camp 4. Neighboring climbers initially assumed they were simply resting after their arduous summit push, completely unaware of the silent unfolding crisis within their tent. Most people didn't think much of it at the time. Rest is common after a summit. During the pre-dawn hours, both climbers entered a terminal phase of functional decline.

[00:20:16]Physical evidence indicates minimal coordinated movement with oxygen equipment partially detached or improperly secured and no sustained corrective action evident. Attempts to maintain mass placement or oxygen flow appear to have become sporadic and ineffective. By the time early morning activity resumed across camp 4, no further movement or response was observed from inside the tent. The lack of external engagement during this final phase meant the deterioration progressed without interruption. Headlamps passed, voices somewhere nearby, then nothing again. The camp never fully sleeps up there. It just goes quiet in pieces. The camp never fully sleeps up there. It just goes quiet in pieces. During the routine check rotations, light movement continued around clustered tents, but Serene and Leland's tent stayed unchanged. No sound came from inside. No sound came from inside. No movement at the entrance. Nothing that suggested anyone was awake. Because other tents requiring active assistance were reporting clear symptoms or requesting support. Attention during these rounds remained prioritized toward climbers with immediate or observable distress.

[00:21:24]As a result, no escalation trigger was recorded for Serene and Leland during this cycle, and their tent remained unentered under standard operating assumptions that silence indicated rest rather than crisis. Several hours later, a Sherpa, whose name was later identified as Pang, became concerned by their prolonged absence and the complete lack of any activity emanating from their tent. She didn't do it fast.

[00:21:48]Nobody does. There's always that pause right before you know you're going in anyway. Both Sirin Gamboa and Leland Koreah were found unresponsive inside their sleeping bags, their oxygen masks a skew or completely removed, their faces pale and still, their breathing had ceased, and their bodies were cold, succumbing to the extreme conditions. A recovery team composed of experienced sherpas and a medical professional from a neighboring expedition carefully examined the tent and the bodies later that day under standard post incident procedures. The assessment included a detailed review of oxygen equipment configuration, medication use, and environmental exposure conditions inside the tent. Medical findings indicated that both climbers had succumbed to severe altitude related illness, specifically high alitude cerebral edema and high alitude pulmonary edema compounded by extreme exhaustion, profound dehydration, and critically insufficient oxygen delivery during the night. Their condition was consistent with prolonged hypoxic exposure at extreme altitude where physiological compensation mechanisms had failed under sustained stress. The evidence, particularly the positioning of oxygen systems, partial disconnection of regulators and observed physiological indicators suggested a progressive decline over several hours rather than a single acute event. Investigators reconstructed a timeline in which diminishing oxygen efficiency, cognitive impairment, and reduced motor coordination likely interacted in a compounding cycle of deterioration. In practical terms, investigators concluded that both climbers experienced a cascading failure of oxygen dependent brain and lung function following an exceptionally demanding summit day leading to systemic shutdown of vital bodily processes. The absence of corrective intervention during the critical overnight window further reduced any remaining margin for recovery. Once that oxygen balance starts collapsing, there isn't much the body can do to pull it back. The delayed descent combined with severely impaired judgment, depleted oxygen reserves, and limited external monitoring due to established interaction patterns earlier in the expedition created a situation in which independent self-correction became progressively impossible. Once symptoms escalated beyond a critical threshold, no evidence of foul play was identified or suspected. The deaths were officially classified as accidental consequences of extreme high altitude exposure and acute altitude sickness resulting from a convergence of environmental severity, physiological breakdown under hypoxia, and individual decision-making under deteriorating conditions.