Shishumar and Sindhughosh Class of Submarines : Pictures and Discussions

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Looks like they are extending life of all shishumar class (S209-1500) submarines.
 
Paras Defence and Space Technologies Limited, has received an order from Instruments Research and Development Establishment (IRDE), Ministry of Defence,Government of India, Dehradun, valued at approximately ₹ 61.43 crores (incl taxes) for Upgrade of Optronic Periscope Sight with Accessories, including ESM Warner, for Indian Naval Submarine Application.

This could be for Type 209 upgrade.