The body of Munwal, who was the first to spot the fire in the third compartment of the submarine, was taken to Chandanwadi crematorium in central Mumbai after the conventional wreath-laying ceremony.
The body was put in a casket wrapped in a tri-colour. It reached the crematorium around 4 pm and was given guard of honour with about a dozen Navy men firing three rounds in the air.
Chawala said she had spoken to Munwal some days before he went on the mission.
"He was sure that nothing will happen to him in the submarine," she said, speaking to reporters.
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"He wished to die for the country while on duty so that his body will be draped in the tricolour and guard of honour will be accorded to him," said Chawala.
Chawala also said it was very painful for him when he learnt about the INS Sindhurakshak mishap last year.