
"Conventional submarines usually need to come to the surface every three to four days for replenishing their oxygen supply," an official of the Defence Research and Development Organisation (DRDO), which has developed the Air Independent Propulsion (AIP) system, told IANS, speaking on condition of anonymity.
For the replenishment, a diesel submarine has to come to periscope depth and raise its snorkel, which makes it vulnerable to detection.
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