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You start the game with three submarines. Guide your submarine with the mouse pointer. Press the mouse button to fire a torpedo upward toward the surface. Press the keyboard space bar to fire a torpedo to the right. Since it takes your crew some time to reload the torpedo tubes, you are allowed a maximum of one torpedo at a time in each direction. This is a BIG game please wait while it loads.

As the submarine captain, you must destroy all ten of the merchant ships in the top row before you can move on to your next mission. Try not to torpedo hospital ships. It's a violation of international law--and the consequences can be pretty immediate. Skillful maneuvering will be necessary on advanced missions in order to survive exploding depth charges, hostile torpedo fire, and magnetic mines.