Wait for the applet and sounds to finish loading, this may take a minute or two. The game screen will show "Game Over" once everything is ready. In the meantime you can review the instructions below. The object is to destroy all ten of the merchant ships in the top row before you can move on to your next mission. Guide the submarine with your mouse pointer. Note: If the game doesn't seem to be responding to key presses, click your mouse pointer in the game area.
Playing the Game
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. 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! He has many friends in these waters, and they won't take too kindly to it.
Controls
Mouse	Navigation	Space bar	Fire torpedo to the right
Left mouse button	Fire torpedo toward the surface
Hints
Do not torpedo the Dolphin	The dolphin resupplies your ship with fuel and torpedoes.