It's work in progress... it's developed in our spare time, but developed with lots of dedication and attention to details. At the moment, it's playable, but don't expect a full game with campaigns/career, etc... It's still in relatively early alpha stage, it's not even a beta, so that should give you an idea. Still, if you're interested, you can check it out, perhaps offer some help, i don't know what area interests you, but since this is a 100% voluntary work project, we apretiate any help. You don't need to be a software developer, nor a 2d/3d artist (we're buried in artwork to make it worse, altough we could use developers). If you want to help you can always translate the manual, or improve it, getting references to help us, etc...
Everyone's work moves the project forward, but don't expect an SH3, like i said, it's a voluntary project, not a multimillion dollar fulltime project with a team of 30 developers & artists
P.S.: you can choose uboat types, wonder around, sink ships (or get into trouble with the convoy's escorts), etc... single mission works perfectly, but no campaign/career, and custom missions are dependent of a standalone mission editor (also work in progress).