Hundreds of skeletons were found in a mysterious Himalayan lake. A new analysis shows that some of them died 1,000 years apart.

Nestled 16,500 feet up in the Indian Himalayas, a tiny body of water has earned a macabre nickname: “Skeleton Lake.”

Officially called Roopkund Lake, the almost perpetually frozen lake is less than 135 feet in diameter, yet it’s the final resting place of up to 800 human bodies. In the summer, when parts of the lake melt, scattered skeletal remains float to the surface. Bones litter the shore, a few with frozen hair and flesh still attached. Bold visitors have stacked some of the remains into morbid shrines.

hundreds-of-skeletons-were-found-in-a-mysterious-himalayan-lake-a-new-analysis-shows-that-some-of-them-died-1000-years-apartScientists aren’t sure what ᴋɪʟʟᴇᴅ these people. After a British guard discovered the lake in 1942, scientists determined that the skeletons weren’t victims of a World War II scuffle — the bones were far too old. Yet there was no discernible explanation for how or why these people perished.

Last month, a DNA analysis of 38 skeletons from the lake added a new layer of mystery: It found that the skeletons belonged to three genetically distinct groups that ᴅɪᴇᴅ in at least two waves, about 1,000 years apart.

hundreds-of-skeletons-were-found-in-a-mysterious-himalayan-lake-a-new-analysis-shows-that-some-of-them-died-1000-years-apartA melting pot of skeletons
For the analysis, published in the journal Nature Communications, the research team drilled into long bones — like thigh bones and upper-arm bones — and extracted DNA from the resulting bone powder. They found that of the 38 skeletons examined, 23 had ancestry related to people from present-day India, while 14 were most closely related to people from the eastern Mediterranean islands of Crete and Greece, and one had Southeast Asian ancestry. The size and shape of the bones confirmed that finding: Some of the bones belonged to people who were “very robust and tall, ” while others were more “gracile,” or long and lanky, the authors wrote.

hundreds-of-skeletons-were-found-in-a-mysterious-himalayan-lake-a-new-analysis-shows-that-some-of-them-died-1000-years-apartRadiocarbon dating revealed that the group of 23 ᴅɪᴇᴅ between the seventh and 10th centuries during several events, while the other 15 ᴅɪᴇᴅ between the 17th and 20th centuries, likely in a single event.That discovery changes scientists’ understanding of Skeleton Lake, since a 2003 expedition suggested that most of the people whose bones were discovered at the site ᴅɪᴇᴅ around 800 AD.
“This finding shows the power of radiocarbon dating, as it had previously been assumed that the skeletons of Roopkund Lake were the result of a single catastrophic event,” Douglas Kennett, one of the authors of the new study, said in a press release. Researchers still aren’t sure how these people perished.Even though scientists now know that the lake holds the bones of people from distinct parts of the world who ᴅɪᴇᴅ at different times, they aren’t any closer to determining what ᴋɪʟʟᴇᴅ them.
“It is still not clear what brought these individuals to Roopkund Lake or how they ᴅɪᴇᴅ,” Niraj Rai, a senior author of the new study, said in the press release. “We hope that this study represents the first of many analyses of this mysterious site.”

But according to Rai and his coauthors, the new analysis puts some theories about what ᴋɪʟʟᴇᴅ the people in the lake to rest. These groups probably didn’t ᴅɪᴇ in an epidemic, as a 2004 National Geographic documentary suggested, because the DNA analysis found no evidence of bacterial infection in any of the skeletons. “The analysis suggests that the Roopkund individuals were broadly healthy,” the authors wrote.
A battle probably wasn’t the reason either, since the analysis found that the skeletons came from 23 males and 15 females, including children and elderly people, and no weapons were found nearby. Yet another idea is based on a local folk song that describes a mass pilgrimage to the shrine of a mountain goddess, called Nanda Devi, near the lake. The study’s authors said the song is about “a king and queen and their many attendants, who — due to their inappropriate, celebratory behavior — were struck down by the wrath of Nanda Devi.” The lyrics recount the goddess flinging balls as “hard as iron.”

Rai’s team said it was possible that some in the first wave of Skeleton Lake bones came from “a mass death during a pilgrimage event.” The lake is near a present-day pilgrimage route through the region, the authors wrote. But the researchers argued against another theory that aligns with the folk song. The team behind the 2003 expedition suggested that the skeletons could have come from merchants who perished in a freak hailstorm. That’s unlikely, the new study says, because Roopkund “is not situated on any major trade route.”
Plus, Rai said, the fate of the second group of skeletons is still a total mystery.
“We have tried to answer all possible sources of genetic ancestries of [the] Roopkund skeletons but failed to answer why Mediterranean people were traveling to this lake and what they were doing here,” Rai told National Geographic. Kathleen Morrison, an anthropologist at the University of Pennsylvania who was not involved in the study, offered one possible explanation.

“I suspect that they’re aggregated there, that local people put them in the lake,” she told The Atlantic, noting that it’s unlikely that all these people ᴅɪᴇᴅ at the lake. “When you see a lot of human skeletons, usually it’s a graveyard.”

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