INS Shishumar (S44)
INS Shishumar (S44) is the lead vessel of the  of diesel-electric submarines of the Indian Navy. She was commissioned on 22 September 1986 under Commander P M Bhate. Mid Life Upgrade

Indian Navy awarded $151mn contract for mid-life upgrade and certification of INS Shishumar, the refit will be carried out by Mazagon Dock, Mumbai with technical cooperation from ThyssenKrupp Marine Systems. The refit is planned to be completed by 2021 with a similar upgrade for another vessel of  to follow. References

Shishumar-class submarines
Attack submarines
Ships built in Kiel
1984 ships
Submarines of India