The victims have been identified as Naresh Yadav, 56, a welder, Mohammad Arif, 21, and Anil Jha, 46. According to preliminary information, the three workers lost consciousness shortly after entering the tank and died of suffocation.

Three contract workers suffocated while cleaning a wastewater tank at the Hosur facility. The deaths have triggered investigations into workplace safety practices and possible violations.

The deaths, which occurred late on Monday, will be investigated by Apple, Tata and the state authorities, state officials and two industry sources, cited by Reuters, said.

According to the police, the three workers were engaged in cleaning a wastewater storage tank known as the Nano Filter (NF) Tank.