Two different level thing. Just take the example of Japanse, they have been producing industrial gas turbines for quite long time. But they are still relying on foreign companies for their marine gas turbine.I don't think marine engine is a big challenge for us. Last time when I was in BHEL, I saw them making huge Industrial gas turbines
For any new starter, the turbine blade is only one of lots of challenges. Let's look at Japan again, they are one of the earliest producers of SCB, where is their marine gas turbine engine?at that time they were using imported material for DS turbine blades. Since we have developed good SCBs, we can easilty develop marine engine, only thing we lack is political will.