The Nepali army has been working to rescue survivors who had been trapped inside a tunnel at a hydropower project in Rasuwa.

Footage shared by the country's prime minister office shows soliders carrying survivors and crawling across thick slates of mud to reach others.

An update issued by officials on Thursday indicated more than 100 people were estimated to have been trapped in the same tunnel.

It forms part of rescue efforts being carried out across the country in the wake of the deadly flood as local police said the Nepal death toll reached 475 on Friday.