
... Read someone made a mod with Nuke shells for the deck gun
J/K
Welcome aboard
What others said.
Get U-boat Mission which is version 1.5 (if you don't already).
When starting a game / campaign (after entering a name, port of departure, starting date and so on) you'll find yourselve standing behind your desk looking at a map on the wall, look to the left and you'll see a bookshelve, move your mouse over it and you see some books highlight with 'options' lighting up. Thats the place to set every setting to easy / 0% realisme.