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NUWAKOT — Rescuers struggled on Monday through mud and debris for a sixth day, as the number of missing people soared to nearly 4,500 since tsunami-like glacial floods roared down from the China-Nepal border, creating an "unimaginable" disaster.
The latest confirmed death toll surged above 900, with unidentified bodies buried in mass graves after DNA sampling.
The huge wave of freezing water, rocks and debris that smashed into villages and towns on Wednesday killed at least 939 people in Nepal and in Tibet, in China, with at least 17 bodies also pulled from rivers downstream in India.
Nepali Prime Minister Balendra Shah, in a statement on Sunday, called the disaster "unimaginable and heartbreaking".
Rescue teams are in a race against time in treacherous conditions to free around 100 hydropower workers believed trapped in multiple tunnels -- digging, drilling and blasting through debris.
So far, three dead bodies have been pulled out of two tunnels, and the teams have found routes blocked with mud.

A young boy (C) climbs on a ledge to paste photographs of missing persons in the aftermath of flash floods, at the Tribhuvan University Teaching hospital in Kathmandu on August 31, 2026.
An Indian army officer deployed as part of a specialised tunnel rescue team said rescuers were digging through "sludge". He told AFP he was "still hopeful" there were survivors inside.
Amid the horror, there has been some hope; a six-year-old pulled out of the mud on Friday was reunited with her parents after police found her crying for her mother.
"Her body was trapped in mud, but her head was outside," Nepali Armed Police spokesman Netra Bahadur Karki told AFP.
"She is out of danger and recovering at a hospital and has reunited with her family."
'Changing climate'
The disaster was sparked by a glacial collapse, the US Geological Survey said.
While the exact cause of that collapse is unclear, climate change is causing glaciers to melt worldwide, raising the risk of such disasters.
Nepali Foreign Minister Shisir Khanal said: "The people of Nepal are one of the major victims of the changing climate and its impact."
Scientists say the Himalayas, the world's highest mountain range, are melting faster as global temperatures rise.
Aid needs are enormous. Entire communities have been swept away, leaving families homeless in heavy rain or sheltering in temporary facilities.
"This is an unfolding disaster," UN children's fund official Abiodun Banire told AFP, saying the needs of the tens of thousands impacted were vast.
Roads have been washed away, power plants destroyed and dozens of bridges smashed.
"There are too many challenges," said E. Hawadi, a police officer coordinating rescue efforts in the badly affected Nuwakot district.
"There are no roads; they have all been washed away, and many areas are just not accessible," he told AFP on Monday.
Overflowing mortuaries
With mortuaries overflowing with the dead, Nepal has begun burying some of the hundreds of bodies recovered after taking DNA samples so families can later retrieve them.