On September 19, 1991, German hikers Erika and Helmut Simon were crossing the Ötztal Alps when they spotted a human body emerging from the ice near Tisenjoch, at about 3,210 meters above sea level. Only the upper body was visible. As the South Tyrol Museum of Archaeology’s account of the discovery records, the Simons assumed they had found the victim of a recent mountaineering accident.
Instead, the man had died in the Copper Age, more than 5,300 years ago. He became known as Ötzi, after the Ötztal Alps where he was found, and his extraordinary preservation has made him one of the most intensively studied ancient human remains ever recovered. The old picture of his preservation as one uninterrupted five-millennia entombment in glacier ice, however, has since become more complicated.
What the hikers actually found
The discovery site was just inside Italy, close enough to the Austrian border that authorities from both countries became involved. Because everyone initially thought the body belonged to a modern climber, the first recovery attempts were handled as a contemporary mountain accident rather than an archaeological excavation. The corpse was finally freed from the ice on September 23, before an archaeologist had examined it in place.
The objects around the body changed the picture quickly. Ötzi carried a copper-bladed axe, a long yew bow, a quiver and arrows, a flint dagger, birch-bark containers and an unusually complete set of clothing and equipment. A sketch of the axe prompted mountaineer Reinhold Messner to suspect that the corpse was very old. The following day, Innsbruck archaeologist Konrad Spindler examined the mummy and estimated it to be at least 4,000 years old. Radiocarbon dating subsequently placed Ötzi in the late fourth millennium BCE.
He was middle-aged when he died, probably around 46 years old, and stood about 1.6 meters tall in life.
The axe and what it did, and did not, prove
The copper axe is one of the most remarkable pieces of Ötzi’s equipment, but its significance is easy to overstate. According to the South Tyrol Museum’s description of the axe, its blade is 99.7% pure copper. It was cast in a mould and then worked after cooling, and it survives with its yew haft and leather bindings largely intact.
That purity did not suddenly prove that Copper Age Europeans could smelt copper. Copper mining and metallurgy were already known in Europe before Ötzi was discovered. What later analysis of his axe revealed was something different and arguably more interesting.
A 2017 lead-isotope study in PLOS ONE traced the metal to ore sources in southern Tuscany. That was striking because copper deposits in the Alps were already known and exploited during the Copper Age. Ötzi therefore carried metal that had travelled hundreds of kilometers from central Italy into the high Alps, giving archaeologists unusually direct evidence of long-distance connections in the fourth millennium BCE.
Sixty-one tattoos, and an arrowhead in the shoulder
Ötzi’s body carries 61 tattoos, mostly simple groups of lines and crosses. The museum’s anatomical record places them around areas including the lower back, wrist, knees, calves and ankles. Many occur near joints or parts of the body showing substantial wear, which has led researchers to suggest that at least some may have served a therapeutic rather than purely decorative purpose. That interpretation remains a hypothesis, not a certainty.
The cause of death took much longer to establish. In 2001, an X-ray revealed a flint arrowhead lodged in Ötzi’s left shoulder. The projectile had severed the subclavian artery, causing catastrophic blood loss. Researchers also found a deep cut on his right hand that appears to have been sustained several days earlier, evidence that he had been involved in violent conflict shortly before his death.
What his gut told researchers
Ötzi’s stomach and intestines were preserved well enough to retain evidence of his final meals. A 2018 paper in Current Biology, recorded by the University of Vienna, characterized his last meal as rich in fat, wild meat and cereals. Other biological evidence has helped researchers narrow his death to early summer and reconstruct aspects of his diet and environment with unusual detail.
His microbiome has now become another line of research. A study published on June 3, 2026 in Microbiome by Mohamed S. Sarhan, Marco Samadelli, Albert Zink, Frank Maixner and colleagues examined microbial material associated with the mummy and its conservation environment. The study distinguished preserved ancient gut-associated microbial signatures from more recent cold-adapted organisms colonizing the mummy.
That distinction matters. The researchers found that external populations of psychrophilic, or cold-loving, yeasts became relatively more abundant and showed less ancient-DNA damage between samples from 2010 and 2019, evidence consistent with active modern colonization. Their results also point to the possibility of ongoing microbial activity even at sub-zero temperatures.
Ötzi is kept in a conservation chamber at the South Tyrol Museum of Archaeology in Bolzano at about -6 degrees Celsius and 99% relative humidity. Those conditions suppress most organisms associated with decomposition, but the 2026 study shows why conservation teams continue to monitor the mummy’s microbial environment rather than treating it as biologically static.
How the discovery fits into a larger rewrite
Ötzi is often said to have rewritten our understanding of Copper Age Europe. That is closer to the mark when the emphasis is on resolution rather than on one supposedly impossible technology. He preserved real clothing rather than inferred clothing, an individual toolkit rather than scattered artefacts, stomach contents rather than a modeled diet, and a human body carrying evidence of injuries, parasites, worn joints and cardiovascular disease.
The axe adds another layer because its copper came from much farther south than its Alpine setting would suggest. It does not prove that metalworking itself was unexpectedly advanced. It shows that materials, objects or both could move across surprisingly long distances in a period for which those connections are otherwise much harder to see.
Genetics has continued to sharpen that picture. A 2023 reanalysis by researchers at the Max Planck Institute for Evolutionary Anthropology and Eurac Research found that Ötzi had an unusually high proportion of ancestry related to early farmers from Anatolia. The improved genome also indicated advanced hair loss and suggested that he may already have been balding when he died.
The mountain gave him back because it was melting
The immediate reason Ötzi became visible in September 1991 was a warm summer that had melted enough ice at the site to expose his upper body. For years, the standard story held that he had been rapidly buried after death and then remained sealed beneath glacier ice until that melt released him.
That story has changed. A 2022 reassessment in The Holocene, summarized by the Austrian Academy of Sciences, concluded that Ötzi and his artefacts were repeatedly uncovered by melting during roughly the first 1,500 years after his death, and perhaps later. The researchers argue that he was not immediately and permanently entombed beneath ice and that some damage to the artefacts is better explained by natural processes at the site.
That makes his survival no less remarkable. It makes it stranger. The mountain preserved a human body, clothing and equipment across more than five millennia without the simple, uninterrupted deep-freeze once imagined.
Today Ötzi lies at -6 degrees Celsius in a purpose-built chamber in Bolzano. The science around him is still changing, from the provenance of his axe to the microbes living around his preserved tissues to the history of the ice itself. More than three decades after two hikers mistook him for a recently dead climber, he is still forcing archaeologists to revise the story.