First, I try and be a good Kaleun in that they were attempting to slow the supplies to Britain. Sinking destroyers, not attacking ships to reduce the score, sneaking into harbors etc are not what a real Kaleun did and I am trying to alter SH3 so the results mimick reality.
The last career of 600K included 2 battleships, 2 destroyers, 2 Frigates an armed trawler and a PT boat. That was too much IMO but fun.

Wulfmann