The addon contains a beta model of a German U-Boat. The modelling is well done, and the boat features a deck-mounted 30mm gun. Unforntunately the thing will not dive yet, and there are no
torpedoes, but the final version should be able to address these issues. It looks good in the screenshots, but what you can't see from them is that most of the time the boat is shuddering neurotically from side to side, making it unusable for anything other than a nice scenery object at the moment. The length of the U-Boat also highlights a need for a longer wake trailing after boats in the game. Yes, that was a hint, addon makers. Anyway, I wouldn't bother downloading this for now unless you're bored and want a look at this for yourself. If the issues are addressed in the final version, though, it'll be well worth a look.