"Kalvari is likely to be commissioned this month after extensive sea trials," Vice Admiral Girish Luthra, Flag Officer Commanding of the Western Naval Command, told reporters.
"Kalvari underwent around 120 days of extensive sea trials and tests for various equipment," he said.
The vessel is expected to bolster India's maritime prowess, the senior Navy official said.
The submarines, designed by French naval defence and energy company DCNS, are being built by Mazagon Dock Limited in Mumbai as part of Project-75 of the Indian Navy.
Kalvari is named after the dreaded Tiger Shark, a deadly deep sea predator of the Indian Ocean.
The first Kalvari, commissioned on December 8, 1967, was also the first submarine of the Indian Navy. It was decommissioned on May 31, 1996, after nearly three decades of service.
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