We said before that you would see more of the girl hanging around the eastern docks. Well if you talk to her she insists that the threat is only temporarily quelled. She seems pretty wise for a young girl.
As you approach the docks, you'll notice something a little different -- a submarine bobbing up and down in the water. Gunnar is there manning the craft. You soon realize that you'll be shorthanded in the fortress, with only 3 party members (since Gunnar has to stay with the sub), but luckily the girl overhears your conversation. Her name is Mel, and after some concern from the others, it is agreed that she will come with you. Hop on board!
Hopefully you saved your game, because the following mini game offers no way out except successful completion. You control a submarine, using the slider on the bottom left to move left and right, and the big red button on the right to fire torpedos. This game is quite important and doing well can be very very helpful, so our recommendation is to kill at least 10 sharks and 100 crabs. You'll get level points for the sharks (10 each) and gold for the crabs (100 each). If you do well in this game, you may never struggle for gold again, and your abilities will be greatly enhanced. Of course, you also have to be careful not to crash into the walls of the trench or any of the baddies. You can always retry, but be careful not to retry if you are happy with your performance.