Everest 1986: Erhard Loretan and Jean Troillet's 43-Hour Alpine Blitz

In late August 1986, two young Swiss mountaineers pulled off what many high-altitude purists still consider the most audacious, radical, and athletic ascent in the history of Mount Everest: a non-stop, lightweight speed sprint up the 3,000-meter North Face, completed from Base Camp to summit and back in just 43 hours.

The climbers were twenty-seven-year-old Erhard Loretan, a carpenter and UIAGM mountain guide from the Swiss Pre-Alps, and thirty-eight-year-old Jean Troillet, a rugged mountain guide from the Valais. Both men were physical phenomena, possessing cardiovascular systems conditioned to continuous rapid movement in high alpine terrain.

The Philosophy of the “Naked” Mountain

Traditional Everest expeditions in the 1980s were massive sieges involving tons of equipment, miles of fixed nylon ropes, dozens of high-altitude Sherpas, and hundreds of bottled oxygen canisters.

Loretan and Troillet rejected all of it. They believed that heavy gear was not a safety measure, but an anchor that slowed climbers down, keeping them trapped for weeks in the dangerous objective hazard zone of falling ice and rock. Their philosophy was the complete antithesis: travel ultralight, climb at night, and move with superhuman speed.

They carried no supplemental oxygen, no ropes, no tents, no sleeping bags, and no cooking stoves. In their small twenty-liter daypacks, each man carried only a lightweight headlamp, spare batteries, a thermos filled with warm tea, warm gloves, crampons, an ice axe, and a pocketful of chocolate and dried fruit.

Their chosen route was the most direct line on the mountain: the Japanese Couloir transitioning straight into the Hornbein Couloir—a narrow, vertical cleft of 60-degree snow and ice slicing 3,000 vertical meters through the limestone cliffs of the North Face.

The Night Sprint

Because the Hornbein Couloir acts as a natural funnel for falling rocks and daytime powder avalanches once the sun warms the upper face, climbing during the day was suicidal. Loretan and Troillet made the calculated decision to climb almost exclusively in the dark.

At 10:00 PM on August 28, 1986, Loretan and Troillet crossed the bergschrund at 5,850 meters on the Central Rongbuk Glacier and stepped onto the face. The night was bitter, with temperatures dropping below -25°C, but the cold kept the snow hard and frozen. Front-pointing in continuous rhythm without roping up, their headlamps illuminated narrow cones of white ice as they surged upward at an astonishing pace.

By dawn on August 29, having climbed continuously for ten hours through the freezing night, they were already at 7,800 meters. The steepness increased to 60 degrees as the couloir narrowed between the yellow rock walls. To rest, they did not pitch a tent—they simply sat down on the snow for twenty minutes, leaned their heads against their knees, drank a mouthful of lukewarm tea, and kept moving.

At 8,400 meters, near the base of the Yellow Band, severe fatigue and thin air began to bite. They stopped for a 90-minute sit-bivy in a shallow snow scoop to wait for daylight. At 8,500 meters, navigating vertical constrictions of mixed ice and brittle rock, their lungs burned with every breath. But their acclimatization was flawless.

Summit at 1:30 PM: August 30, 1986

At 1:30 PM on Saturday, August 30, 1986, Erhard Loretan and Jean Troillet stepped onto the summit of Mount Everest (8,848m).

They had climbed the entire 3,000-meter North Face in a continuous push of 31 hours. They stood on the roof of the world without oxygen masks, their faces framed by frost-caked balaclavas, looking out across the vast brown plains of Tibet and the green valleys of Nepal.

They remained on top for only thirty minutes. In the thin air at 8,848 meters, with no bivy gear, spending the night on the summit would have meant certain death. They had to get down—and their method of descent would become the stuff of mountaineering folklore.

The 3.5-Hour Glissade Down the North Face

Most climbers spend two to three agonizing days descending from the summit of Everest. Loretan and Troillet descended the entire mountain in three and a half hours.

Reversing their tracks down to the top of the Hornbein Couloir, they sat down on the 60-degree snow slope. Wearing windproof nylon anoraks and smooth shell pants, they tucked their boots forward, gripped their ice axes under their arms to act as steering rudders and friction brakes, and glissaded directly down the face.

Sliding at speeds reaching 30 to 40 miles per hour, they rocketed down the steep couloirs. When their speed became too terrifying or when they approached rock outcrops, they dug the steel picks of their axes into the hard snow, throwing up rooster-tails of white powder to slow their momentum.

By 6:00 PM on August 30, 1986—just four and a half hours after standing on the highest point on Earth—Loretan and Troillet slid across the bergschrund and stepped off the face onto the Rongbuk Glacier.

Their total round-trip time from Advanced Base Camp to the summit of Everest and back was an unbelievable 43 hours.

Legacy of an Unmatched Feat

The Loretan-Troillet speed blitz of Everest’s North Face remains an unmatched pinnacle of athletic audacity. It proved that in the hands of elite, perfectly acclimatized alpinists, speed and minimalism were the ultimate weapons against high-altitude objective danger. Erhard Loretan’s 43-hour masterpiece proved that Everest could be climbed not as a military siege, but as a pure, joyous sprint of human vitality.