This game I like for how fun it is to blow submarines up and try to be stealthy but I warn you this game is really complex and takes some time just to learn how to tell if something is friend or foe but int he end its always fun to make a flying torpedo hit something so try it at your own risk :).
Edit due to its just a short review, long in depth (submarine joke) one below.
Sub command is a complex simulation game made by the people who made Dangurous Waters,Fleet Command, and 688(I) Hunter/Killer and when I mean complex I mean complex. Don't get me wrong it is a great game involving tactics, stealth, and a realistic sonar. Now there is a small campain that revolves around the 688(I) sub, the Akula and the Seawolf but I found the side missions better because they offer a wide arrange of diffrent missions and circumstances. Things that people not like about this game is the fact that its hard to read the sonar or how to acually fire a torpedo correctly, but when you acually hit your target it feels so releiving its almost something to celebrate for, though if you hear your coms say torpedo in the water and you see more blips on the sonar you start to get cold and stiff. One final thing is that this game is a precursor to Dangurous Waters so it is best to learn how to use the subarmine here because dangurous waters dosent have a interactive tutorial and you eiter have to be overwhelmed or watch videos the game wants you to watch, so its a good thing to know 6-8 buttons on the screen so you can just figure out the 2 you need. All and all this game is a great game and if you get multiplayer to work its fun freaking out your friends by firing torpedos at them and making it miss by a inch, I would buy this game and give it to a friend if it was like 49 cents or else I would buy this game for me if it was 10 or under (which I have).