State disaster response official, Durgesh Rathodi told newsmen that about forty one workers are trapped inside.
He stated that while rescuers are scrambling to reach them beneath piles of debris, that oxygen is being supplied through the same channel.
Durgesh expressed fears that more rubble was coming down as they tried to remove the obstruction.
The tunnel is being constructed between Silkyara and Dandalgaon to connect two of the holiest Hindu shrines of Uttarkashi and Yamnotri.
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