The avalanche that shook the Himalayas
On the morning of August 26, 2026, part of a glacier at around 5,200 metres collapsed onto the Lhende river valley in Tibet's Gyirong County, next to the Nepal border. The mass of ice and rock fell some 1,200 metres, temporarily dammed the river and, when that natural dam gave way, released a torrent of water, mud and debris that rushed down the Bhote Koshi and the Trishuli towards Nepal's Rasuwa district and, further downstream, Nuwakot and Dhading.
The phenomenon, technically known as an ice-rock avalanche, caught the authorities by surprise: it was not raining that day. The US Geological Survey (USGS) attributed the magnitude 5.2 seismic signal recorded that morning to the landslide itself rather than to an earthquake. It was the start of one of the worst natural disasters in Nepal's recent history.
The figures
Tolls rose dramatically as teams reached the devastated areas. Early figures in late August spoke of around 390 dead; six weeks later the number was almost four times higher.
Nepal. When Nepal's government ended the search-and-rescue phase in early October 2026, it counted at least 1,455 dead and 5,285 missing, including hundreds of foreign nationals, according to Reuters and AP. Nearly 13,800 people were rescued and some 33,000 were affected.
Tibet (China). According to the official Xinhua news agency, as of September 8, 2026 the toll on the Tibetan side stood at 43 dead and 519 missing. The destruction of the Gyirong border crossing made access to the area difficult.
Damage. Around 7,500 buildings damaged or destroyed and roughly one million cubic metres of debris covering roads and farmland, according to UNDP. Nepal's government estimates the cost of recovery and reconstruction at about 4.77 billion US dollars.
Missing figures vary depending on which official register is consulted and may be revised as identifications progress.
The cause: glacier collapse and climate change
The trigger was the collapse of an unstable section of the glacier. Scientists have not yet established whether climate change contributed to this specific collapse, although they point out that Himalayan glaciers are losing mass at an accelerating rate and that the preceding weeks were unusually warm.
Factors under study:
- Rising temperatures: Warming weakens high-mountain ice and permafrost
- Structural instability: Retreating glaciers lose cohesion and become more prone to collapse
- Topography: Narrow, steep valleys channel and amplify the force of the flood
- Valley occupation: Roads, border crossings and hydropower plants concentrate people along the riverbed
Experts warn that disasters of this kind may become more frequent as melting accelerates in the Himalayas, known as "the third pole" for the vast ice reserve it holds.
Domino effect: from avalanche to flood
The avalanche was not the only danger. It was the dammed water, released all at once, that multiplied the reach of the disaster.
Cascading impact:
- Initial avalanche: A mass of ice and rock breaks off the glacier
- River blockage: The debris dams the Lhende river
- Water build-up: A temporary lake forms behind the natural dam
- Dam failure: The dam gives way under the water pressure
- Flash flood: A wave of water and mud rushes down the Bhote Koshi and the Trishuli, which rose by up to 9 metres in half an hour according to early reports
At least 19 bridges and some 40 kilometres of road were destroyed in the first days, and communities outside the avalanche's path were devastated by the water. After the disaster, Nepalese authorities warned that a new lake formed at the source could trigger another flood.
International rescue operation
More than 5,000 Nepalese army and police personnel took part in the search for survivors in the first days. Nepal's army rescued around 350 workers and residents trapped in a tunnel at the Upper Trishuli hydropower plant.
International aid:
- India sent an aircraft with around 10 tonnes of supplies
- The International Federation of Red Cross and Red Crescent Societies (IFRC) released one million Swiss francs from its emergency fund
- The UN allocated 2 million US dollars from its Central Emergency Response Fund
- The European Union activated the Copernicus satellite mapping service
- Countries such as Australia, the United States and South Korea provided funding or support teams
Teams worked in narrow valleys, on unstable ground, with roads cut off and the risk of further floods. In early October the government moved from active searching to the rehabilitation and reconstruction phase, a decision that divided the families of the missing.
Citizen solidarity
The tragedy sparked a wave of international solidarity. Individuals, companies, organisations and governments around the world contributed to rescue and humanitarian efforts.
Social media became tools for citizen organisation, with calls for donations and crowdfunding campaigns to help affected families and support reconstruction.
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How to help from Spain
If you want to help the victims of the Nepal avalanche and floods, there are several ways to do so:
Financial donations:
- Official appeals from the Red Cross Movement and United Nations agencies
- NGOs with a long-standing presence on the ground in Nepal and experience in emergencies and reconstruction
- Before donating, check that the organisation reports transparently on how funds are used
In-kind help:
- For distant emergencies, organisations usually recommend giving money rather than goods: it allows them to buy locally what is really needed and avoids transport costs and delays
Specialised volunteering:
- Technical profiles (rescue, healthcare, logistics) are channelled through humanitarian organisations themselves, not independently
Nepal and climate change
The 2026 Nepal avalanche is a tragic reminder of the fragility of high-mountain regions. The glaciers of the Hindu Kush Himalaya hold one of the largest ice reserves outside the poles and are retreating at an accelerating rate.
Figures from ICIMOD's HI-WISE report (2023):
- Glaciers in the region lost mass 65% faster in 2010-2019 than in the previous decade
- With 1.5-2 °C of warming they could lose 30% to 50% of their volume by 2100
- Under a high-emissions scenario, the loss could reach 80%
- Around 240 million people in the mountains and another 1.65 billion in the river basins depend on this water
Cutting greenhouse gas emissions and helping Himalayan communities adapt to these risks are both urgent tasks.
Lessons for the future
The 2026 Nepal avalanche left lessons the world cannot ignore. The need to monitor unstable glaciers and lakes, the importance of cross-border early warning systems and the urgency of cutting emissions are conclusions experts repeat after every catastrophe of this magnitude.
Reconstruction will require years of coordinated work between governments, international organisations and local communities. International solidarity will be essential, but it must be accompanied by decisive climate action to prevent future disasters.
Nepal has once again shown its resilience in the face of adversity. Reconstruction will be not only of infrastructure, but also of lives and hopes in one of the regions most vulnerable to climate change.