A tunnelling expert tells the BBC that a "Goldilocks zone" may hold more survivors, after Sanjaya Shah and Kabir Maharjan were rescued alive on Friday.

One of two workers rescued from a hydroelectric plant said he had recited prayers over and over while trapped deep underground. “How many days has it been?” he asked.

An additional 4,216 people were believed to still be missing, officials said.

More than 10% of Nepal's energy generation capacity was knocked out by last week's floods.

An Australian engineer advising the effort described how two men were freed after nine days trapped in a tunnel at the Upper Trishuli 3A hydropower plant.

By Nicoco Chan and Tingshu Wang GYIRONG, China, Sept 6 (Reuters) - About 20 Chinese rescue workers in bright orange operated excavators, shovels and ground-penetrating radar detectors on Sunday in an effort to find hundreds of people missing since a tsunami-like mudslide destroyed China’s main border crossing with Nepal.

During disasters, geospatial data provides information by allowing large amounts of spatial information to be plotted on maps that support informed decision-making

The flash flood near the Nepal-China (Tibet) border has wrecked the Himalayan nation's key road link to Tibet, highlighting the risks facing Beijing's proposed Belt and Road Initiative (BRI) railway between Tibet and Kathmandu.