The men have been trapped since Sunday's disaster.

A glacier collapsed on the hydro electric dam they were working on was swept away.

The death toll as of Tuesday was close to 30.

On conditions are not helping.

Rescue efforts to Ari is from the National Disaster Response Force.

There are many tunnels that air interlinked, so when we remove mud from one part of the tunnel because of the pressure differences, more mud comes in from other tunnels, so the speed of work is not as fast as we would like.

The workers were among 197 people who officials said were still unaccounted for.

Drones and thermal imaging equipment have also been deployed to help locate survivors.

The situation remained bleak.

According to Indian Power minister RK Singh, 93 workers him missing.

A total of 93 workers of the project is still missing and we're assuming that they will not be found now and should be considered dead, millions for dirty money.

Officials have yet to conclusively determine what caused the disaster.

Those scientists investigating it believe heavy snowfall, followed by bright sunshine may have triggered the glasses collapse.