Ok, so 10 minutes ago my first career ended on my 4th patrol. Sunk 4 ships, set course back to base, then got detected by a destroyer.
First two depth charge runs didn't do any damage, but after the third my sub began taking water, and it sank. What surprised me was how hard it was to lose the destroyer. Seemed impossible
But there must be some basic techniques, right..? So... what do I need to know to succesfully lose enemy destroyers?