Back when I was a kid, watched the TV Series; "Voyage to the bottom of the Sea". In one of those episodes they were looking out of the Viewing windows and this German U-Boat was rising from the bottom and turning to point its bow tubes at the Seaview. (cant remember what happened or why) So I began trying to find out what that sub was, and more about it.
I used my first Sub Simulation in 1985 in Groton at Sub School.
Played my first Sub Game "Silent Service" in 1986-87.
Played my second in 1994 "Silent Hunter"
Always read books about WWII Subs, US & German. Still do.
Frank