In this episode of Stuff You Should Know, hosts Josh Clark and Chuck Bryant examine one of mountaineering's greatest unsolved mysteries: whether George Mallory and Sandy Irvine reached the summit of Mount Everest in 1924, nearly three decades before Edmund Hillary's confirmed ascent. The episode covers the early British expeditions to Everest, detailing the primitive equipment, extreme dangers, and physical challenges climbers faced at high altitude.
The discussion focuses on Mallory's obsession with Everest, his selection of Irvine as a climbing partner, and their final summit attempt that ended in tragedy. The hosts explore the evidence surrounding their disappearance, including the 1999 discovery of Mallory's body with intriguing clues—notably the absence of his wife's photograph that he vowed to leave at the summit. With Irvine's body and camera still missing, the question of whether they reached the top before perishing remains unanswered.

Sign up for Shortform to access the whole episode summary along with additional materials like counterarguments and context.
Mount Everest was confirmed as the world's tallest peak in 1852, standing at 29,032 feet, but it wasn't until the early 20th century that climbing it became a serious possibility. By 1920, the Royal Geographic Society and Alpine Club formed the Mount Everest Committee, seeking permission from Tibet to explore potential routes to the summit.
In 1921, a reconnaissance team including George Mallory mapped the North Col route from Tibet—a challenging 22-mile approach from base camp to summit. The following year, the 1922 expedition established a camp at 25,000 feet, and climbers reached a record altitude of 26,800 feet without supplemental oxygen. Tragedy struck when an avalanche killed seven Sherpa porters, weighing heavily on Mallory's conscience. These early climbers pioneered techniques using rudimentary equipment—tweed jackets and leather boots—and experimental oxygen apparatus that added 30 pounds per climber. Mallory himself was skeptical of oxygen equipment and declined to use it. Sherpa porters were essential to these expeditions, carrying enormous loads and providing vital support, though their contributions were rarely acknowledged in contemporary accounts.
As Josh Clark explains, climbing Everest required mastery of multiple disciplines—hiking, mountain climbing, ice climbing, and rock climbing—all while crossing dozens of miles of varied terrain just to reach the base. Climbers faced invisible crevasses over 100 feet deep, avalanches, and house-sized ice blocks called seracs that could topple without warning.
At extreme altitudes, Chuck Bryant describes how climbers move in slow motion even with supplemental oxygen, taking a single step followed by 15 to 30 seconds of rest. The intense UV radiation reflected off snow caused snow blindness, temporarily blinding climbers like Norton during their descent. High-altitude coughs could become severe enough to suffocate climbers like Howard Somerville. Survival depended on establishing camps at progressively higher elevations; as Bryant notes, climbers had to reach shelter before nightfall or risk death from exposure above 20,000 feet.
George Mallory began his career as a progressive schoolteacher who socialized with the Bloomsbury Group, including John Maynard Keynes and Virginia Woolf. His life transformed when he became fixated on Everest, participating in all three British expeditions from 1921 to 1924. In 1921, he quit his teaching job and left his family for seven months to pursue his dream. Mallory famously explained his motivation with the phrase "Because it's there."
Dr. Tom Longstaff considered him "quite unfit to be placed in charge of anything, including himself," characterizing him as flighty—exemplified by his accidentally loading film backwards in 1922, ruining all photographs. Despite these blunders, his pioneering climbing ability remained beyond question. Strikingly handsome, Mallory vowed to carry his wife's portrait to the summit and leave it there. By the 1924 expedition, he was 37 years old and facing his last opportunity to reach the summit.
Mallory selected Sandy Irvine as his partner for his mechanical aptitude with oxygen equipment rather than climbing prowess. On summit day, geologist Noel O'Dell observed two black dots at 12:50 p.m. on the northeast ridge, seeing them overcome a rock step. However, they were hours behind schedule, making a safe return before nightfall unlikely. O'Dell waited at high camp, then used six crossed sleeping bags to signal their presumed deaths.
The debate centers on whether Mallory and Irvine surmounted the Second Step, a formidable barrier before the summit. O'dell maintained until his death at age 97 that they cleared the Second Step and that nothing would have stopped Mallory from pressing on. A 1999 National Geographic expedition found Mallory's preserved body with a severe broken leg, rope trauma, and a fatal head wound. Intriguingly, his wife's photograph—which he vowed to leave on the summit—was missing from his otherwise intact possessions.
The critical missing evidence is the Kodak Vest Pocket Camera believed to be with Irvine's unfound body. Modern film-developing techniques could potentially provide photographic proof of a summit. Rumors persist that a Chinese climber found an English body in 1975 but died soon after, or that the 1960 Chinese team may have found the camera and suppressed the findings. Irvine's ice axe turned up in 1933 at high altitude, and a 1991 expedition found an old oxygen bottle confirming their advanced position. Yet subsequent searches have come up empty, and the central question of whether Mallory and Irvine reached Everest's summit in 1924 remains one of mountaineering's greatest unsolved mysteries.
1-Page Summary
Mount Everest, standing at 29,032 feet, was confirmed as the tallest peak in 1852 by Indian surveyor Radhanth Sikdar, who used data produced by the British during their occupation of India. The mountain was named after Sir George Everest, director of the Indian survey, but for Tibetans it has long been known as Chomolungma, meaning "Mother Goddess of the World." For decades after its height was established, Everest remained an untouchable giant; people could only gaze at it. It was not until the early 20th century that climbing Everest even became a serious consideration.
By 1920, the idea that Everest could be climbed entered the realm of possibility. The Royal Geographic Society and the Alpine Club collaborated to form the Mount Everest Committee, which sought permission from Tibet to conduct exploratory expeditions. This was the era when mountaineering ambitions and the spirit of adventure converged to make Everest the ultimate climbing target.
In 1921, the Everest Committee was granted rare clearance by Tibet for a reconnaissance expedition—not a summit attempt, but an effort to discover and map a feasible route onto Everest. Before this expedition, no European had been within 60 miles of the mountain, so the journey was truly into uncharted territory.
The 1921 team, including a young George Mallory, began the foundational work of modern Everest exploration. Their most significant achievement was mapping the North Col route, a difficult and time-consuming approach from the Tibetan side. This northern route, still used today, presents intense challenges: it demands more time at higher elevations with lower oxygen concentrations and requires a journey of 22 miles from base camp to the summit, in contrast to about twelve and three-quarters miles for the Nepalese southern route established decades later. On September 24, 1921, the team reached the North Col, believing it to be the most likely path to the summit.
In 1922, a return expedition marked a turning point. The team established a camp at 25,000 feet, the highest ever at that time, creating a precedent for future climbing strategies on Everest.
Mallory and fellow climbers achieved a record altitude of 26,800 feet, turning back just a thousand feet short of the summit; another climber, Edward Norton, pressed even closer, reaching well within a thousand feet of the peak. These heights were reached without the benefit of supplemental oxygen, in what were then considered astonishing feats.
Tragedy struck during a later summit attempt when an avalanche, triggered on the third try, killed seven Sherpa porters further down the mountain. Mallory, who had advocated for the attempt, felt responsible for the disaster, though it was a joint decision among the climbers. The loss cast a shadow over the expedition and altered the narrative of Everest's early climbs.
The early Everest climber ...
Early Everest Expeditions (1921-1924) and Mountaineering Techniques Evolution
Mount Everest’s early climbs demanded far more than simply ascending its formidable slopes. Climbers faced a series of complex physical and environmental challenges that required mastery of multiple disciplines, survival skills, and constant adaptation to deadly hazards.
Climbing Everest is not a straightforward ascent from a single point. As Josh Clark explains, mountains are rarely isolated; Everest is embedded in extensive ranges. Reaching the base of Everest itself requires climbers to journey over dozens of miles, crossing other mountains and ridges, each with its distinct challenges. The trek to Everest's base camp alone demands proficiency in hiking, mountain climbing, ice climbing, and rock climbing, often at steadily rising altitudes that early British explorers were unaccustomed to. This prelude, punishing in itself, is just the beginning of the ascent.
Success demanded simultaneous expertise in navigating glaciers, scaling ice and rock, and quickly acclimatizing to the thinning air. Each section of the climb featured unique perils, requiring climbers to adapt on the fly while their bodies dealt with increasing altitude sickness.
One of the first obstacles—regardless of approach—was Everest’s glaciers. These ice fields are riddled with deep, often hidden crevasses that could be more than 100 feet deep. A misstep could send a climber plummeting into a “death trap” from which survival was unlikely, especially with the rudimentary equipment of the early 20th century.
Besides the threat of falling into crevasses, avalanches and ice slides (seracs)—house-sized blocks of ice—could suddenly tumble down slopes or topple, crushing anything in their path. These glacier dangers demanded constant vigilance and swift, skilled movement, making even the initial approach to Everest hazardous.
Ascending Everest brought climbers into the “death zone,” where oxygen concentration plummets. As Chuck Bryant describes, even with modern supplemental oxygen climbers move in slow motion, taking a single step, pausing for 15 to 30 seconds, and repeating—sometimes traversing just a few feet between breaks. In the early days, such ascents were attempted without supplemental oxygen, compounding the strain on human physiology.
At extreme altitude, even well-equipped modern climbers become less communicative, often exhibiting distress or regret for the ordeal. The lack of oxygen leaves climbers compromised, physically and mentally, with every step becoming an exhausting trial.
The intense UV radiation at high altitudes, reflected by snow, can burn corneas in a condition known as snow blindness, or ker ...
Early Challenges and Dangers of Climbing Everest
George Mallory began his career as a progressive, left-leaning intellectual and a schoolteacher. He moved in elite circles, socializing with influential members of the Bloomsbury Group, such as economist John Maynard Keynes and author Virginia Woolf. At this stage in life, his status as a schoolteacher connected to these prominent thinkers was his peak brush with fame before he redirected his focus to Mount Everest.
Mallory’s life took a defining turn when he became fixated on climbing Mount Everest. This obsession was evident in the fact that he was the only member to participate in all three major British expeditions to Everest in 1921, 1922, and 1924. His drive was so intense that, in 1921, he quit his teaching job and left his wife and children for at least seven months to join the first scouting expedition to Everest. Mallory’s singular motivation for climbing was famously distilled in his iconic response to why he wanted to summit the mountain: “Because it’s there.” This phrase, famously attributed to Mallory, has echoed through mountaineering history, encapsulating his relentless urge to conquer the unknown.
Mallory's peers had mixed feelings about his leadership and reliability. Dr. Tom Longstaff, the expedition doctor in 1922, famously remarked that Mallory was “quite unfit to be placed in charge of anything, including himself,” characterizing him as flighty and prone to mistakes. This reputation was reinforced during the 1922 expedition when Mallory, tasked with taking photographs, accidentally loaded the film backwards, resulting in a complete loss of photographic records from the climb. Despite such blunders, Mallory’s pioneering ability as a mountaineer remained beyond question. Modern climbers and his contemporaries alike revered his unique climbing style and remarkable talent, recognizing that, unlike today’s mountaineers who benefit from established techniques and knowledge, Mallory and his peers were charting new ground for the first time.
Mallory’s physical appearance and personal charism ...
Mallory's Character, Background, and Drive to Summit Everest
On the third and final push to summit Everest in 1924, George Mallory selected Sandy Irvine, an engineering student, as his partner not for his mountaineering prowess but for his mechanical aptitude. Irvine’s expertise with the vital oxygen apparatus—crucial for high-altitude climbing—was seen as invaluable. His “ox-like” build further complemented Mallory’s lighter, technically skilled frame, creating a well-matched team for the grueling ascent. This was Mallory’s third Everest expedition, underscoring his obsession with reaching the summit—a last, desperate bid to fulfill his dream. Throughout their ascent, Mallory and Irvine kept in contact with the lower camps by sending down encouraging notes via Sherpas, indicating optimism about the weather and their progress.
Noel O’dell, a geologist on the expedition, was performing “trail magic” by ferrying supplies to high camps and searching for fossils. At 12:50 p.m. on the day of the summit attempt, O’dell observed two black dots moving on Everest’s northeast ridge. He later recounted seeing them overcome a rock step: “My eyes became fixed on one tiny black spot beneath a rock step in the ridge. The black spot moved. Another black spot became apparent and moved up the snow to join the other on the crest. The first then approached the great rock step and shortly emerged at the top. The second did likewise.”
O’dell’s training as a geologist and excellent eyesight (he didn’t need glasses until his nineties) bolstered his credibility as a witness. However, Mallory and Irvine were hours behind schedule. Their late position on the ridge, with adverse weather moving in, made a safe return before nightfall highly unlikely. O’dell waited at high camp for their return and, after days of searching at extreme altitude, ultimately used a prearranged signal—laying out six crossed sleeping bags—to mark their presumed deaths. After 11 days above 23,000 feet, he was instructed to abandon the search and return.
The route to Everest’s summit from the north side involves three significant obstacles, known as the First, Second, and Third Steps. O’dell’s testimony is central to the debate about whether Mallory and Irvine surmounted the Second Step—a final, formidable barrier before the top. Many who believe Mallory and Irvine reached the summit rely on O’dell’s observation that they ascended the Second Step; he was adamant about this even in a 1997 interview at age 97. However, some detractors argue that O’dell perhaps saw the climbers on the First Step, which, while still a noteworthy achievement, would not have put them within striking distance of the summit. O’dell maintained, until his death, that nothing would have stopped Mallory from pressing on, regardless of the risks and the late hour.
A 1999 National Geographic expedition found Mallory’s well-preserved body high on Everest’s slopes. The forensic evidence revealed a severe broken leg, rope-ligature trauma around his waist, and, most notably, a golf-ball-sized puncture wound to his forehead—a likely result of falling and striking his head with his ice axe, possibly when the axe bounced off a rock during the fall. The snapped rope still secured around Mallory’s waist suggested it had been anchored to an immobile object such as a rock, not to Irvine, implying Mallory sent Irvine back before his final push—or that their fates became separated during a fall. Intriguingly, Mallory’s cherished photograph of his wife, which he vowed to leave on the summit if he succeeded, was missing, despite his other possessions being well-preserved. Some see this as circumstantial evidence that he may have reached the top and left the photo there.
A critical missing piece is the Kodak Vest Pocket Camera carried by the climbers. If their camera—believed to be wi ...
Competing Theories and Physical Evidence of the Summit Attempt
Download the Shortform Chrome extension for your browser
