Nepal's National Disaster Risk Reduction and Management Authority reported 939 confirmed deaths and 3,925 people missing as of August 31, though some bulletins reported 4,247 missing, with 592 foreigners among the missing and 933 hydropower workers initially reported unaccounted for across multiple projects, a count that some reports later revised to 639 [2][13][23]. The government warned of new flooding from barrier lakes formed by the disaster, even as rescue teams backed by Chinese and Indian experts pressed into blocked hydropower tunnels along the Trishuli River [22][27]. Sixteen deaths and 546 missing were reported on the Chinese side in Tibet's Gyirong County [8][24].
Rescue teams at the Trishuli-3A tunnel broke through a small opening to pump in air and send a camera inside, while soldiers and engineers blasted through boulders to reach workers believed trapped in tunnels at 11 hydropower plants [22][18][23]. Nepali Army spokesman Brigadier General Raja Ram Basnet said a large amount of debris deposited in the tunnels posed a big challenge to opening them [1][8][27]. Australian tunnelling engineer Arnold Dix said the landscape had been so obliterated that the tunnel signatures were gone, describing it as a lunar landscape [23][31]. Mohan Kumar Dangi, chairman of Nepal's Independent Power Producers' Association, estimated around 300 people trapped in one tunnel at Upper Trishuli-1 and roughly 500 across 12 projects [18][31]. Geoscientist Jakob Steiner said the tunnels were large enough to shelter people but that rescue was a race against time because the trapped needed food and water [18]. Relatives of workers trapped at Upper Trishuli-1 surrounded the promoter company's office after five days without rescue operations, accusing the company and government of stalling while injured people clung to cliffs without food, and secured an agreement for helicopter rescue the next morning [38].
The disaster's cause remains contested. The US Geological Survey determined that a glacier collapse in Langtang National Park near the Nepal-China border triggered the flood [12][13][26]. Researcher Alton C. Byers said permafrost that has acted as frozen glue holding rock, ice and glaciers together is being weakened by warming, and assistant professor Ashim Sattar said climate-driven warming may have destabilized the slope [36]. UN Climate Chief Simon Stiell said a warming climate driven by fossil fuels is making such tragedies more likely, frequent and severe [19]. Foreign Minister Shisir Khanal said Nepal contributes only 0.1% of global emissions yet its people have become major victims of climate change [12][26]. Prime Minister Balendra Shah said the incident indicates that Himalayan risks are increasing alongside climate change and called for raising the issue with the international community [23][30]. Nepal's finance and environment ministers co-signed a letter to the Loss and Damage Fund requesting emergency financing before its December board meeting, with climate official Maheshwar Dhakal saying the damage far exceeds Nepal's domestic capacity [33]. Climate advocate Dikshya Subedi, whose husband's village was wiped out, demanded climate justice and Loss and Damage disbursements as grants rather than loans [34].
Several scientists cautioned against direct attribution. Professor Stuart Dunning of Newcastle University said the flood cannot be simply attributed to climate change, as multiple factors may be involved [36]. University of Dayton director Umesh K. Haritashya said initial satellite data suggested the event did not involve a glacial lake breach [36]. Turkish scientist Tolga Görüm described the mechanism as a wedge slide producing a dry-liquefaction rock avalanche that dammed the Lhende Khola valley then burst, and said it was not earthquake-triggered [43]. Disaster risk reduction specialist Saswat Sanyal of ICIMOD said it was necessary to be cautious and not draw a connection yet, while noting that the chances of such disasters increase [31].
A cross-border early-warning dispute has emerged alongside the scientific debate. Hydrologist Sauhardra Joshi of Nepal's Flood Forecasting Division said Nepal wants early word on glacier movements from the Chinese side, which it has not received [39]. Hydrologist Binod Parajuli said China provides heavy-precipitation forecasts but not data on avalanches, water levels, landslides or extreme events, and that at a May 2026 meeting the Chinese said they lacked the mandate to sign an agreement [39][44]. Former Environment Minister Madhav Prasad Chaulagain said Nepal received no timely warning from China before the disaster and that a protocol agreed after a smaller 2025 glacier incident was not used [32]. Professor Dibyesh Anand of the University of Westminster argued that China's militarized control over Tibet keeps glacial and river data secret, leaving Nepal without effective early warning [15]. Human Rights Watch documented Chinese censorship of the Gyirong disaster zone, with journalists barred and at least 10 people punished for rumormongering [40]. Tencho Gyatso, president of the International Campaign for Tibet, called on China to disclose complete and verifiable information about damage and casualties [26].
Beijing's foreign ministry said its release of information has been open, transparent and timely, and rejected reports that China is underreporting deaths [26][27]. Chinese state broadcaster CGTN reported more than 2,000 rescuers clearing the G216 highway in Gyirong and said barrier lakes above Gyirong Port had largely drained [24]. Stimson Center senior fellow Austin Lord said the lack of bilateral cooperation was not a significant factor because the glacier collapsed in a relatively unmonitored area, and that traditional early-warning systems are not designed to detect such fast-moving flash floods [36][39]. An opinion column in Bangladesh's Prothom Alo suggested Nepal's new government is seeking strategic autonomy, trying to avoid dependence on any single regional power for rescue and diplomatic assistance [15].
Nepal's government response has drawn both defense and criticism. Information Minister Bikram Timilsina acknowledged the government was initially confused about how to deal with the crisis but said it has since put all efforts into swift search, rescue and relief [25]. Government spokesperson Sasmit Pokharel said the first priority was saving citizens' lives with available resources [25]. Former Foreign Secretary Madhu Raman Acharya praised the government's promptness and coordination among security agencies [25]. Former National Reconstruction Authority CEO Govinda Pokharel criticised the federal government for managing the crisis without adequately involving local and provincial governments, and said the delayed decision on foreign help cost three crucial days [25]. Bidur Deputy Mayor Prabha Bogati said local authorities had limited scope because the federal government used a centralised one-door command [25]. The government has collected over 5 billion Nepali rupees in a disaster relief fund [25].
The human toll has extended across borders. Indian authorities in Uttar Pradesh recovered bodies from the Gandak-Narayani river system flowing from Nepal, with DNA sampling underway before handover [2][35]. Additional District Magistrate Vaibhav Mishra of Kushinagar reported 13 bodies recovered and said strong currents made recovery difficult [35]. Nepal began temporary mass burials after DNA sampling because morgues were overwhelmed and bodies were decomposing, with Bharatpur district director Ganesh Aryal saying authorities had no choice due to the public health risk [16][23]. Nepal's Ministry of Health said only 4% of the 900 bodies recovered had been identified [23]. Families described searching hospitals for missing relatives, with some holding hope that oxygen systems inside tunnels could keep workers alive [12][23]. A six-year-old girl was pulled alive from mud after more than 60 hours, with police confirming she was out of danger [26][29]. Headmaster Rajendra Dawadi evacuated over 900 students from Tribhuvan Trishuli Secondary School with 14 minutes' warning after an accountant received a call from a relative in Rasuwa, saving lives while the school itself was destroyed [6][31].
International assistance expanded as South Korea dispatched a 44-member disaster relief team to Nepal [21][41]. India's tunnel rescue team began joint operations with the Nepali army at the Chilime and Langtang hydropower sites [42]. China sent rescue experts and relief supplies to Kathmandu, with Nepal's science minister Mahabir Pun thanking Beijing for help clearing blocked tunnel entrances [24]. The UK sent a rapid deployment team and a £5m support package [27]. The UN reported that WFP food, UNICEF therapeutic food and WHO disease-outbreak monitoring were underway, with UN spokesperson Stéphane Dujarric saying access remained the biggest obstacle [19]. UNICEF official Abiodun Banire described an unfolding disaster with vast needs [26]. Nepali celebrities including Miss Nepal Deepmala Dhakal, singer Durgesh Thapa and actor Pal Shah distributed food, clothing and medicine directly to flood-hit communities in Nuwakot and Rasuwa [14]. Law Minister Sobita Gautam called for rewriting Nepal's development model so it can withstand disasters, citing the Jure landslide, the 2015 earthquake and recurring floods as evidence of a recurring cycle [28].
Rescue operations at the hydropower tunnels continued as the government warned that two barrier lakes posed new flood threats to downstream sites [22][27]. Researcher Nitesh Khadka warned that an overflowing barrier lake could send a sudden flood into downstream tunnels and power stations where rescuers are working [22][31]. District administrator Narendra Pariyar of Rasuwa said weather improved on Monday and rescue work picked up pace [27].