"This was the worst accident in the history of Indian Navy during non-combat time. The investigation should probe whether it was an act of sabotage. It can also be a result of terrorist attack," he said in a statement, adding that the actual cause will be known only after the inquiry.
A conventional submarine of Indian Navy had exploded after a fire on board and sank in the dockyard yesterday in Mumbai, in which 18 personnel, including three officers, are feared to have been killed.
Noting that the loss of the submarine was considered a "big setback" to the Navy, he said people responsible for the security of the nation should not be "negligent."
He said the "tragic incident" occurred just days after the proud achievements of the launch of indigenous aircraft carrier 'INS Vikrant', and generation of electricity using atomic energy in a submarine.
"I appeal that all precautionary measures should be taken to ensure that such incidents do not occur again," he said.
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