Ten feet off the summit of the world’s highest mountain, Brian Dickinson’s vision went completely white. The sun had bounced off the ice and burned both corneas, and for the next several hours, he would descend the most dangerous 3,000 vertical feet on the planet alone and blind. His story of climbing Mount Everest, told on the Degrees of Success podcast (University of Phoenix, Episode 012), is not the version of Everest you usually get in a glossy brochure. It is a story about oxygen, cold, decision-making under pressure, and what happens when the body runs out of air at 29,032 feet.
This guide uses that real account, along with verified altitude and oxygen data, to answer the two questions almost every prospective climber and trekker actually asks: what is it really like to climb Everest, and why does the air up there try so hard to kill you?
Quick facts before you read on:
- Everest’s summit sits at 29,032 ft (8,849 m), roughly the cruising altitude of a commercial jet
- Mount Everest oxygen levels at the summit are about one-third of what they are at sea level
- Most climbers switch to supplemental oxygen around 23,000 to 26,000 ft
- A full expedition, from Lukla to the summit and back, typically takes about two months
- The trek in from Lukla to Everest Base Camp alone covers roughly 38 miles
A Real Story of Climbing Mount Everest: Brian Dickinson’s Solo Summit
Brian Dickinson is a former US Navy rescue swimmer turned high-altitude mountaineer and author of Blind Descent. In 2011, on his fourth attempt at one of the Seven Summits, he climbed Everest largely independently of the big commercial groups, partnered with a young Sherpa climber named Pang. Instead of joining the crowd on the standard summit window, Dickinson pushed for the summit a day earlier than most teams, which meant he avoided the long queues you have probably seen in news photos from the Hillary Step.
That decision meant something else too. As Pang fell behind with altitude sickness near 28,000 ft and eventually turned back to wait lower down, Dickinson continued alone through the final stretch of the climb, the Cornice Traverse, and the Hillary Step itself, becoming, according to the Himalayan Database, one of only two climbers on record to have the Everest summit entirely to themselves on a given day.
What makes this story of climbing Mount Everest useful for other travelers is not the record. It’s what happened next.
Pro tip
Most Everest content online focuses on cost, permits, and gear lists (and we cover all of that too, linked below). Very few articles walk you through what your body and mind actually experience between 26,000 ft and the summit, which is the section of the mountain where most fatal decisions happen. If you’re researching a big-mountain trip of any kind, study the descent as closely as the summit push. Statistically, and in Dickinson’s own account, the way down is where things go wrong.
Mount Everest Oxygen Levels Explained
Understanding Mount Everest oxygen levels is the single most important piece of physiology for anyone reading an Everest story, planning a trek toward base camp, or simply curious why climbers wear masks in every summit photo.
At sea level, the atmosphere is about 21% oxygen, and your body is used to that pressure pushing oxygen into your bloodstream. As you gain altitude, the percentage of oxygen in the air barely changes, but the air pressure drops, which means each breath delivers far fewer oxygen molecules. At Everest’s summit, barometric pressure is low enough that the amount of oxygen available to your lungs is roughly one-third of what it is at sea level. Pilots flying at that altitude breathe pressurized cabin air for exactly this reason; climbers on the mountain have no cabin.
This is why every serious Everest itinerary is built around acclimatization rather than speed. Climbers move from Base Camp (17,500 ft) up to Camp 1, Camp 2, and Camp 3, then back down to rest, repeatedly, over roughly a month. Time at altitude followed by rest at a lower camp triggers the body to produce more red blood cells, which carry oxygen more efficiently. Skip that process and climb straight to altitude, and the body simply cannot function long enough to survive, let alone climb.
Supplemental oxygen typically enters the picture around 23,000 ft, and climbers rely on it consistently from Camp 3 upward through the death zone above 26,000 ft, the zone where, in Dickinson’s words, a cut on your finger will not heal. The oxygen mix used on the mountain isn’t pure oxygen either. Similar to how World War II fighter pilots managed their oxygen systems, climbers use a blended supply so the body doesn’t crash when the tank runs out or the mask is removed.
What Is Altitude Sickness and How Does Low Oxygen Cause It?
Altitude sickness is the body’s response to a sustained drop in available oxygen, and it can range from a mild headache and nausea at Base Camp to life-threatening cerebral or pulmonary edema higher on the mountain. The mechanism is straightforward: low oxygen forces the heart and lungs to work harder, fluid can build up in the lungs or brain, and judgment, coordination, and physical strength all decline together. In the podcast interview, Dickinson describes exactly this pattern in his climbing partner Pang, who began vomiting and lost strength near 28,000 ft before turning back, a textbook progression of altitude illness that experienced Sherpa climbers recognize immediately.
Breathing challenges at extreme altitude aren’t only about how much air is available either. Cold, dry mountain air also strips moisture from the lungs with every breath, which is part of why climbers describe a persistent cough (sometimes called the “Khumbu cough”) on long expeditions.
The Route to Base Camp: 38 Miles Before the Real Climbing Starts
Everest climbers and most Everest Base Camp trekkers fly from Kathmandu into Lukla, widely described as one of the more challenging airports in the world because of its short runway set into a mountainside. From there, the trek to Base Camp runs about 38 miles through the Khumbu Valley and takes roughly 10 days, partly because of the terrain and partly because trekkers need to gain altitude slowly, the same acclimatization principle that governs the climb above Base Camp.
If you’re planning the trekking route rather than a full expedition, our Everest Base Camp Trekking Guide for Beginners breaks down the day-by-day itinerary, and our Mount Everest category hub has permit, cost, and season guides if Everest is on your own list.
Above Base Camp, climbers face the Khumbu Icefall, a shifting river of house-sized ice blocks that must be crossed on aluminum ladders lashed together over deep crevasses. Dickinson crossed it roughly eight times during his acclimatization rotations, since the route through the icefall changes constantly as the ice moves. From there, the path leads to Camp 1 and Camp 2 (Advanced Base Camp), then up the Lhotse Face to Camp 3, the highest camp in the world, before the final push to the South Col at 26,000 ft and the summit itself.
Pro tip
If you’re only trekking to Base Camp and not climbing beyond it, you’ll still cross sections of the Khumbu Valley that show you the icefall from a safe distance. Ask your guide to point out the route changes year to year. It’s one detail almost every generic EBC blog skips, and it’s a genuinely interesting way to understand how dangerous the climbers’ route above camp actually is, even if you never set foot on it.
Snow Blind and Alone: What the Descent Actually Tested
After reaching the summit alone, before turning around, Dickinson realized something his radio call had missed: nobody on the mountain knew he was climbing solo. His Sherpa partner Pang was already an hour below him. A goggle malfunction earlier in the climb, one lens cracked after the goggles slipped and fell 500 ft down the mountain during an oxygen break, had left him without full eye protection. Combined with the intense UV exposure at extreme altitude, that damage caused snow blindness within minutes of starting his descent from the summit.
Snow blindness usually resolves within about 24 hours. Dickinson would not regain full eyesight for a month and a half, and he had to descend the most technical sections of the entire route, including the Hillary Step and the narrow Cornice Traverse, using only touch, sound, and memory of the fixed ropes.
Partway down, he also ran out of oxygen entirely near 28,000 ft, roughly 33 hours into a climb that had already cost him about 20 pounds of muscle mass, a common physical toll of extended time above the death zone, where the body burns lean tissue simply trying to survive. He describes stopping, dropping to his knees, and asking for help in a moment he still calls a turning point in the story: “God, I cannot do this alone. Please help.” Moments later, he located a spare oxygen bottle Pang had left in the snow, got it working, and continued the descent, eventually meeting Pang again near Camp 3.
The wider point for readers who will never climb above 8,000 meters is simple. Every major goal, physical or otherwise, tends to have its own version of this stretch: the part after the achievement where you still have to get yourself home safely. Dickinson’s own framing of it, breaking an overwhelming descent into one deliberate step at a time, is advice that transfers directly to long trekking days, difficult exams, or any project that looks impossible from the middle of it.
Lessons From a Real Everest Climb
A few takeaways from this story of climbing Mount Everest apply well beyond the mountain itself:
- Acclimatize before you push. Dickinson’s month of rotations up and down the mountain and the science behind Mount Everest oxygen levels both point to the same lesson: the body needs time, not just fitness, to handle low oxygen.
- Plan for the descent, not just the goal. Most of what went wrong on his climb happened after the summit, when fatigue, low oxygen, and reduced judgment compounded each other.
- Have a backup plan for critical gear. A cracked goggle lens changed the entire outcome of the climb. On any high-altitude trip, redundancy for eyewear, oxygen, and navigation gear is not optional.
- Break large challenges into single steps. Whether it’s a mountain, a long trek, or a demanding season of life, Dickinson’s repeated advice, both in the podcast and in his second book, Calm in the Chaos, is to find one reason to take one more deliberate step forward.
Pro Tips for Anyone Preparing for a Mount Everest Expedition or Trek
- Start supplemental oxygen training and awareness early. Even trekkers who only reach Base Camp benefit from understanding how low oxygen affects appetite, sleep, and decision-making above 12,000 ft.
- Carry a spare set of goggles or glacier glasses with two lens options, and check both lenses for fog or cracks daily above Camp 1.
- Budget real rest days into any itinerary. Our Everest Pre-Climb Tips guide covers a practical acclimatization schedule for both trekkers and climbers.
- If you’re comparing costs and permit requirements before booking, see our full Everest cost and permit guide for current pricing.
- Talk to your guide or Sherpa team about altitude sickness symptoms before you leave Kathmandu, not once you’re already feeling unwell at altitude.
People Also Asked About the Story of Climbing Mount Everest
What are the oxygen levels on Everest at the summit?
Mount Everest oxygen levels at the summit are roughly one-third of sea-level oxygen availability, which is why climbers rely on supplemental oxygen above roughly 23,000 to 26,000 ft.
At what altitude do climbers start using oxygen at altitude on Everest?
Most expeditions introduce supplemental oxygen around 23,000 ft, with consistent use from Camp 3 (about 24,000 to 24,500 ft) through the death zone above 26,000 ft.
How long does it take to climb Mount Everest?
A full expedition, including acclimatization rotations, generally takes about two months from arrival at Base Camp to summit and descent.
What is altitude sickness, and can it be prevented?
Altitude sickness is the body’s reaction to reduced oxygen at height, ranging from headaches and nausea to life-threatening swelling in the brain or lungs. Slow, staged acclimatization, adequate hydration, and descending quickly at the first serious symptoms are the standard prevention and treatment approach.
Do Everest Base Camp trekkers need supplemental oxygen?
No. Base Camp sits at 17,500 ft, well below the altitudes where climbers typically use supplemental oxygen, though trekkers can still experience mild altitude sickness and should acclimatize carefully on the way in.
Related Reading on AskMeNepal
If this story of climbing Mount Everest has you researching your own trip to the Khumbu region, these guides go deeper on specific parts of the journey:
- Everest Base Camp Trekking Guide for Beginners
- Everest Death Zone Explained
- How Much Does Climbing Everest Cost
- Hiring a Porter for the EBC Trek
- Full Mount Everest category
If Everest isn’t the only region on your list, browse our guides to the Annapurna region, the Langtang Valley, Upper and Lower Mustang, or start planning in Kathmandu. For video walkthroughs of these routes, visit our Nepal Travel Guide video hub, and see the full library of posts on our main blog page.
About this guide: Written and reviewed by the AskMeNepal editorial team, drawing on Brian Dickinson’s account from the Degrees of Success podcast (University of Phoenix, Episode 012) and his book Blind Descent, cross-checked against published high-altitude physiology sources. Last updated 2026.
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