Hyderabad, Feb. 24 -- "It appeared like a cloud burst!" was the first reaction of Deepak Jain, who was overseeing the tunnel boring work at a tunnel project site in Nagarkurnool district of Telangana when a portion of its roof caved in on Saturday, trapping eight workers, including two engineers.

Jain, additional general manager of Jaiprakash Associates Ltd, recalled that he was standing outside the Srisailam Left Bank Canal (SLBC) tunnel, near Domalapenta village in the Nallamala forest hill range, around 8.30am on Saturday when its roof caved in at the 14th km with a loud sound. He was the first to come to the rescue of the workers who rushed out after the disaster.

"It was not just cement-concrete blocks and mud that fell on the boring...