The incident occurred in Kaleswaram lift irrigation project (KLIP) in Rajanna Siricilla district.
Three of the deceased were from Chhattisgarh, two from Odisha and one each from Bihar and Telangana, officials said.
The tunnel roof collapsed when the labourers were working at the boomer machine. The air pockets burst causing the collapse of the granite roof weighing about four to five tons.
While five workers died on the spot, one of the two injured succumbed on the way to hospital.
Kaleswaram is stated to be the costliest irrigation project taken up in the country with an estimated expenditure of Rs 80,500 crore.
Chief minister K. Chandrasekhar Rao expressed shock over the tunnel tragedy. He directed the officials to take measures to prevent such tragedies in the future.
Irrigation Minister Harish Rao announced that the project contractor would pay Rs 5 lakh ex gratia each to the kin of the deceased. He also announced a probe into the incident.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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Doraiah Chowdary Vundavally is a Software engineer at VTech . He is the news editor of SocialNews.XYZ and Freelance writer-contributes Telugu and English Columns on Films, Politics, and Gossips. He is the primary contributor for South Cinema Section of SocialNews.XYZ. His mission is to help to develop SocialNews.XYZ into a News website that has no bias or judgement towards any.