On May 29, 2025, a large part of the Birch Glacier in southern Switzerland broke off and caused a strong mudslide in the Lötschental valley. Almost all of the village of Blatten was covered in thick mud, damaging around 90% of homes and buildings. About 300 people and animals had already been moved earlier in the month because the glacier was moving quickly. Local police reported that one 64-year-old man was missing. Rescue teams used drones with heat cameras to look for him. The Lonza River bed was also filled with mud, and there was a risk of water flooding nearby areas. Officials called the glacier collapse a serious event that needed immediate action.

The Swiss army was sent to support the local team and check the damage. The environment minister described the event as unusual and promised help for people who lost their homes. Experts said the fast glacier melting was connected to climate change. Switzerland lost 10% of its glacier volume in just two years. Scientists said this fast change was a warning of future problems. Special systems are now used to watch glaciers and send early signals. This event shows the importance of working together to protect the environment.