"No defence personnel were involved in the accident. The accident is in no way (connected) with any nuclear-related activity. The submarines are safe and the accident does not adversely affect the project activities or the activities of Indian Navy or DRDO," the ministry said in a statement.
Two other workers were also injured in the accident at Visakhapatnam.
The ministry said that the latest accident occurred when L&T, an industrial partner, was undertaking preparatory activities for Hydro-Pressure Testing of a tank at the Ship Building Centre, Visakhapatnam.
"The test of the component was part of the standard industrial process being carried out by the industrial partner," it said, adding that the condition of the two injured workers is now stable.
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