I have no insight on why Indian Navy hasn't went ahead with the planned 2nd overhaul of INS Sindhughosh, and is instead retiring it.
But if I were to suspect, exorbitant cost, timeline of delivery and and capabilities of the Russian OEM to actually carry out this endeavor during the current times, comes to my mind.
Sindhughosh has already been through 2 refits, the third one was canceled. I guess this submarine will become a testbed for DRDO's P-76 program.


