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.
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. Skillful maneuvering
will be necessary on advanced missions in order to survive exploding depth
charges, hostile torpedo fire, and magnetic mines.
Your sub has a limited supply of fuel and torpedoes and must be resupplied
frequently. A supply sub will pass by occasionally near the ocean bottom and
release a trained dolphin carrying fuel and torpedoes. By making contact with
the dolphin's supply pack, you can resupply your vessel. Whatever you do, don't
torpedo the dolphin!