At Control Panel
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1. Disable the active sonar. Turn on the silent sonar with
shift-F4.

2. Dive. Be careful, the maximum depth is 1000 ft. Don't hit
the ground. Fight while the submarine is still diving so
that the enemy torpedo will miss you. When you reach the
bottom, surface. Repeat this during the battle.

3. Press shift-F2 to lower the attack panel. Use shift-F5 to
select your weapon, shift-F6 to lock on target, shift-F8
to fire.
4. Do not fire unless the warship fire first.

5. When the warship fire a torpedo at you. Fire 4 harpoons at
the enemy warship at 4 different interval. Do not fire them
at one shot.

6. Save the game. There is a 30% chance that your harpoon
will hit the warship. When it hit, save the game again
otherwise restore. You will need 4 harpoon to sink the
warship.

7. Because you fire the harpoons at the enemy, it will fire
some torpedos at you. The torpedos will still be heading
for you even when the warship is sunk. When the torpedo is
near you, save the game. If it hit, restore otherwise save
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