Flash floods on the Nepal-Tibet border have left nearly 5,000 people missing, many trapped in hydropower tunnels.

We look at the different nationalities affected by disaster that has killed hundreds and left more than 1,500 missing

Rescue teams say destruction from flash flood has made it difficult to even locate entry points of tunnel

Hundreds believed trapped in hydropower tunnels

Rescue efforts intensify for hundreds of workers missing in Nepal's flood-hit hydropower projects. Mud and debris are blocking tunnel entrances, hindering access for rescue…