You are the commander of a submarine in the waters of the enemy. Use your skills, radar, and good luck to take down the enemy ships. With 8 levels of difficulty there is a lot of the game to learn how you have to keep an eye on your fuel, torpedoes, radar, and the enemy while avoiding depth charges as the difficulty increases. You can fire up to two torpedoes simultaneously. While the enemy shows his periscope sink as many as you can. Periscope can be rotated 360 degrees and look to the horizon, or close to your sub. Some ships move slower than others, and one of the ships is moving so fast that the only way to push it, tracking it using radar, not visually.