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.
 

India’s state-owned HSL in talks with Vietnam for submarine refits


New Delhi: India’s state-owned shipbuilding entity, Hindustan Shipyard Limited (HSL), is reaching out to countries in Southeast Asia, especially Vietnam, amid the Indian government’s push to establish the country as a major defence products exporter and manufacturing centre. Negotiations are underway with the Vietnam People’s Navy (VPN) for submarine refits. Other than Vietnam, the shipyard is looking to explore opportunities in the Philippines