Khatmandu: The death toll from the torrential floods that swept through Nepal in August has reached 1334 according to Nepali officials, with as many as 4000 believed to be missing including 584 foreign tourists. Many of the missing are believed to have been swept away by the flash floods and officials are uncertain of exact number as desperate search and rescue operations move towards more remote locations.

The massive flash flood was caused when a 4000 ton chunk of a glacier collapsed into a valley about 3500 feet below, creating tremors that many interpreted as an earthquake, causing landslides and a massive riverine flood that swept through neighbouring valleys, sweeping away camping sites, bridges and homes.

Meanwhile rescuers are attempting to get to more than 150 people trapped in hydropower tunnels in the Trishuli valley, following the rescue of two workers on Friday. There are believed to be at least 39 workers still in the Trishuli 3A tunnel - where an expert tells the BBC there could be a safe zone with the right conditions for survival - while more than 100 others are believed to be in similar tunnels along the valley.

Nepal's Energy Minister Biraj Bhakta Shrestha said "we have not lost hope" that more survivors can be saved, as rescue operations continue across the country.

"As long as there is breath, there is hope!" he wrote in a post on social media.