This is a good game and a very good simulator
The game play
You have to choose what country you want and you can choose what sides you want to play the choices are Germany, USA and the Japan, the submarines and ships are very good in detail and the way the fight in the game in the sub you have depth gauges and the lowest you can go down is 200 meters but this is the maximum depth you can go down and you hull will start to creak and that means you are going to implode if you don't get to the safe depth.
The graphics
The graphics are very good and the ships and submarines details are very good and when you are hit by a torpedo, the waves from the explosion are very good and when the ship is going through the water a little bow wave is there and it splashes against the ship.
The sound
The sound quality is excellent and when a torpedo hits your ship the explosion sound is realistic and the engine noise is very good and when you start the engines up they fire up like a real ship engines would
So this game is very good and I would suggest that you buy this game because if you like ships and to destroy other ships than this game is for you.