Nine workers were trapped by the collapsed tunnel but rescuers managed to pull seven from the debris.
The incident happened in Sleemanabad, about 450km from Madhya Pradesh’s state capital Bhopal. The 12km-long, 10m-diameter tunnel is part of an irrigation project to carry water from the Narmada River to the Ganga basin.
Local media reports quote the district collector Priyank Mishra saying the nine workers had entered the tunnel to repair machinery.
