Yes...there used to be a U-Boat sim named Grey Wolves. I remember seeing in the bargain bin but never picked it up.
My first subsim was the original Silent Hunter. Still very fond of it a decade later. The graphics in SH are certainly dated by modern standards but seemed much crisper to me than those I found in Aces of the Deep. Neither game gave you the sweeping 3-D exterior views you can have nowdays tho. Really got spoiled by those.
Back to the Pacific in a Gato...someday.
