India, Feb. 22 -- Eight workers, including two site engineers, were trapped inside an under-construction tunnel of Srisailam Left Bank Canal (SLBC) when a portion of its roof collapsed near Domalapenta village in Telangana's Nagarkurnool district, about 120 km from Hyderabad, on Saturday morning, officials said.

The collapse occurred about 14 km inside the tunnel, the total length of which is 44 km. The tunnel roof caved in to the extent of three metres. There were around 51 workers at the site during the incident but around 43 have come out safely. Three of them sustained injuries and they were shifted to the local hospital run by the Telangana power generation corporation.

Nagarkurnool superintendent of police (SP) Vaibhav Gaikwad, wh...