I got hooked to subs not long ago. This year, as a matter of fact.
Early this year, around winter, I was still playing the trusty Steel Panthers (SP Camo), eagerly awaiting the Windows compatible version. I'm a member of the yahoo mailing list for both MBT and WWII, so when a guy asked the question if "there are any games like this, but only with boats", I too started looking. Some mail members replied with links. Doing some searching on my own, I found both Harpoon II (hehehe! What great interface

) and Steel Tide, which is more of an arcade game.
After that, a few googlings found Dangerous Waters, from Sonalysts.
Downloaded the demo and fell deeply in love with the Kilo, whom I have already proposed to. I'm on my lappy right now, and I doubt DW will work as great here as SH does. Though I might try it out.
Immediately, I ordered the game (the deluxe version

).
Arrived soon enough, with a manual the size of a bible! Turned out I'd need it. But the manual could be heckuwa lot bigger!
At times I'd play Civilization III, and DEFINITELY emphasized building submarines!
So now school is nearly upon me... I have to move out of town, to what the yanks would consider "high school" (but for ages 16-19), and got a laptop for that use.
From visiting the DW forums, I know their relationship to SH, but as always I wasn't going to be less curious than to swip over after two months, to find some screens. The little I found (didn't doo too hefty a search) told me this was a really neat game, at least with outstanding graphics.
So... sitting there on 31st of July (exactly one week ago now! *bluurt!* (sound of trumpet)) I wondered if I should buy this game for the laptop or not.... 50 quid was all that was in my wallet, and the game costed 45 bloody pounds on the nearest store (I'm far away from everything; transportation seems to put its price on everything here). I'm sure most here got the game for something like 30.
Anyway... rushed to the store in a moment of need of satisfaction, and soon enough walked out of the same store kinda wiggly in my legs. Had I just spent 50 quid on crap? Time'd tell.
The first indication of that I had, came fifteen minutes later. WHERE IS THE CD KEY?! Well, that answer was answered on this forum.
The second indication of that I had, came half an hour after that. The game was soooooo impossible to handle... for someone who's used to Dangerous Waters.
Struggling still (never bothered with Naval Academy!

), I eventually created the career of Wilhelm Früder, a man who sunk an armed trawler and a destroyer on his first patrol in a U-IIA (I wasn't really too sure of how to use the torps. Kinda came lucky!). Of course, that also made me think less highly of destroyers than I should have, but to this date I haven't suffered more than 5% damage.
Needless perhaps to say, there is no doubt anymore. I love DW more than all that could be considered holy, but this game certainly gives some freedom and has a more play-aroundish feel to it. I'll be using this and some other games during school-time, but I have little doubts of that whenever I return to my stationary, I'll give my Kilo a deep kiss and a hug, and take her out to 300m.