As the rescue operation to save 41 workers trapped in collapsed Uttarkashi tunnel entered its ninth day, experts from around the world were roped in.
President of International Tunneling Underground Space Professor Arnold Dix arrived at the Silkyara tunnel to help in the evacuation. He offered prayers at a small temple built at the main entrance of the tunnel.
Heavy machines have been brought to the site as rescuers continue efforts to create an escape passage for the trapped workers.
Officials said a road to the top of the hill has been laid in a single day for digging a vertical shaft down into the tunnel.