Cryhavoc101
Donor
AFAIK there wasn't one; none of the RIN's handful of major units (bearing in mind the fleet flagship in 1945 was a frigate) were Indian-built, the first domestic warship was Nilgiri in 1972, which was a Leander-class frigate built in Mumbai. Even the two pre-war fleet minesweepers were built on the Clyde. I guess you'd start off building up MGB/MTB from kits - engine industry is likely to be the limiting factor on domestic production but as in many places already mentioned, a domestic industry building big diesels would be a Very Useful Thing (indeed, a thing the UK didn't have itself until well into the war).
Perhaps TATA gets to setup small ship building pre war?
Granted the necessary engines would have to be imported - like the Napier Sea Lion?
But yes heavier industry was light back then in India