BETRAWATI, Nepal – Believing she perished in Nepal’s deadly floods, the family of Chandika Kumari Shrestha started the ritual of mourning the elderly woman’s death.

Ten days later, rescuers found her alive inside her collapsed home in the devastated Betrawati village, where she survived in a narrow pocket of air amid water and mud.

“The four-storey house was swept (away) by the floods, and the house was left in the middle of a quicksand. While walking around it, we heard a voice: ‘Save me’,” police officer Mahendra Darnal said.

In a rescue operation on Sept 5 that lasted 45 minutes, Darnal and his team found Shrestha in a confined space and sent her to an army hospital.

“I was in touch with the family, and they had started the 11-day mourning period,” Darnal said.

Shrestha was among the hundreds missing in Betrawati, an area among the hardest hit by the floods in Nepal and engulfed with white deposits compacted almost like concrete. Crews continue to recover scores of dead bodies.

The town’s market and most residential buildings, some as tall as four storeys, were almost completely buried under debris left by a torrent that swept through the valley, part of a disaster that killed more than 1,300 people across Nepal. Thousands remain unaccounted for.

Rescue workers wearing hard hats were seen digging with shovels, while some were crawling through the gaps of collapsed buildings, periodically blowing whistles to get the attention of anyone trapped and alive.

Five days earlier, 24 bodies were found in a decomposed state in Betrawati’s market area in a building that contained a small shop, Darnal said.

Eleven days since a glacial collapse triggered the devastating floods, close to 5...