INS Shankush (S45) (Ray of Light) is a Shishumar-class diesel-electric submarine of the Indian Navy.

[1] Indian Navy awarded a contract for mid-life upgrade and certification of Shankush on 30 June 2023, the refit will be carried out by Mazagon Dock, Mumbai with technical cooperation from ThyssenKrupp Marine Systems.

[2] The refit is planned to be completed by 2026 and the total cost associated is ₹2,725 crore (US$310 million).

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