Hyderabad, Feb. 23 -- Rescue efforts continued on Sunday to save eight persons trapped in an under-construction tunnel in Telangana's Nagarkurnool district, more than 30 hours after a portion of its roof collapsed.

Teams from the National Disaster Response Force (NDRF), the Army, and the Singareni Collieries Company Litd (SCCL) were engaged in intensive efforts to rescue the trapped men.

About 250 personnel of the NDRF, the State Disaster Response Force and 24 personnel each of the Army, the SCCL, and the Hyderabad Disaster Response and Asset Protection Agency (HYDRAA) were participating in the operation.

Officials said rescue workers were 200 metres away from the point where the roof of the tunnel had collapsed on Saturday. The tunnel...