In May 2025, the picturesque village of Bratten in the Swiss Alps was tragically destroyed by a massive glacier collapse. Thanks to meticulous monitoring, nearly all residents were safely evacuated.

The initial warning signs emerged on May 14, when the Swiss avalanche warning service reported a minor rockfall in the area. Trained observers, who typically have other full-time roles, were on alert for signs of potential danger.

Detailed investigations followed, utilizing images from cameras installed on the glacier after a previous avalanche in the 1990s. “The angles provided crucial insights into shifts in the mountain,” explained Mylène Jacquemart from ETH Zurich, Switzerland.

On May 18 and 19, 300 residents were evacuated, but one individual, a 64-year-old man, resisted leaving his home.

On May 28, the situation escalated as the glacier suffered a catastrophic collapse. “This was an enormous rock avalanche,” Jacquemart stated.

The glacier had accumulated debris from previous years, and when a rockfall occurred, it triggered the collapse of 3 million cubic meters of ice, along with 6 million cubic meters of rock, ravaging a significant portion of the village. Regrettably, the man who opted to remain was killed.

Contrary to some media reports suggesting advanced surveillance technology monitored the glacier, Jacquemart clarified, “The observer’s office didn’t have an elaborate alarm system; a simple red light indicated a problem.”

However, Jacquemart emphasized that Switzerland’s monitoring system ensures effective communication and distinct accountability regarding evacuation decisions.

What contributed to this disaster? The likelihood of rockfalls exacerbated by climate change is a pressing concern. As global warming causes Alpine glaciers to retreat, the incidence of rockfalls is on the rise. Switzerland’s average temperature has increased by nearly 3 degrees since the pre-industrial era, resulting in melting permafrost that allows water to infiltrate cracks in the rocks.

“There’s a clear connection between climate change and the increase in rockfalls,” Jacquemart remarks. “Dramatic transformations are occurring in high-altitude regions, and the consequences are alarming.”

Yet, Jacquemart advises against attributing the Bratten tragedy solely to recent warming phenomena. The slow geological adjustment to post-Ice Age conditions could also be a factor, she notes.

The immediate future remains unclear for Bratten’s residents. Local authorities declared that the village cannot be reconstructed on unstable ground. Plans are underway for rebuilding, but the area remains susceptible to further landslides, and establishing protective measures demands significant financial resources.

“Communities in mountainous regions worldwide, from the Alps to the Andes and the Himalayas, face increasing threats from the intensity and frequency of mountain-related disasters,” stated Kamal Kishore, United Nations Secretary-General for Disaster Risk Reduction, in a recent statement. “Their livelihoods, cultural heritage, and way of life are under severe threat.”