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The efficacy of submarines as a potent military machine was established during the Second World War. Since then, the advancement of these submersible combat vessels have earned them the sobriquet of "silent killers of the deep". They .

Indian oceanJanhavi lokegaonkarSenior researchIndian navyMaritime history societyMazagon dock limited at mumbaiSecond worldMazagon dock limitedMazagon dockCommander narendra kumarSpecial operations commandoCommander narendraSenior research associate