INS Vagsheer (S26) () is the sixth submarine of the first batch of six s for the Indian Navy. It is a diesel-electric attack submarine based on the , designed by French naval defence and energy group Naval Group and manufactured by Mazagon Dock Limited, an Indian shipyard in Mumbai, Maharashtra. The commissioning commanding officer of Vagsheer is Commander Vineet Sharma.
Capable of enemy radar evasion, area surveillance, intelligence gathering, advanced acoustic silencing techniques, low radiated noise levels, hydro-dynamically optimised shape. The submarine has the ability to launch a crippling attack on the enemy using precision guided weapons with both 18 torpedoes and tube-launched anti-ship missiles at the same time, underwater or surfaced. The submarine is armed with 18 torpedoes for anti-submarine warfare and anti-surface warfare. The stealth technology-enabled Kalvari-class submarine is long with a beam of , and has a maximum speed of surfaced and submerged. The submarine has a maximum diving depth of and can stay at sea for 50 days. The diesel-electric propulsion system utilises 360 battery cells.
The submarine has been named after the , a of the Indian Navy which was in service from 1974 to 1997. Vagsheer refers to a type of sandfish found in the Indian Ocean.
Vagsheer, the last of the six submarine, was launched on 20 April 2022. The ship started its sea trials on 19 May 2023. Initially, commissioning was scheduled for December 2024. The submarine was delivered on 9 January 2025
The submarine was commissioned on 15 January 2025 along with and .