Facupa:
Each sub upgrade (and each improvement in a sub's technology) requires more and more 'Reknown'. When back at port you will see what reknown you have and as you click on a desired upgrade it will tell you what you need. Usually it takes a few missions to get enough reknown to make any upgrade and it depends upon your success in sinkings (high tonnage = high reknown). As the game progresses, I will tell you, sinkings become more difficult, reknown less easy to acquire. The whole scenario requires patience and persistence. As in real life.
Hope this helps.
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