@Whabang
If you get SH II then remember to go to
www.subsim.com and download the realism-pack, the 1024*768 patch for it, Messerwetcher. (or how they spell it...) as well as the "2nd Kampanje" campaign, since the game out of the box is pretty flawed when it comes to realism. But after adding the above mentioned mod's it becomes a blast to play. :-D
(even graphically too... ships burning, leaking oil on the surface, and emitting this enormous smoke cloud that can be seen far, far away... eyecandy heaven.