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flag Indian minister lays foundation for naval tunnel and commissions nuclear sub and frigate.

flag Defence Minister Rajnath Singh laid the foundation stone for a Large Cavitation Tunnel at the Naval Science & Technological Laboratory in Visakhapatnam on April 4, 2026. flag This new facility will enable India to test naval systems domestically, boosting self-reliance in propulsion, stealth, and underwater warfare technologies. flag Singh also commissioned the nuclear-powered submarine INS Aridaman and inducted the stealth frigate INS Taragiri into the Indian Navy.

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