Aquatic Mine

Aquatic Mine is a stage in Sonic Adventure 2 and Sonic Adventure 2: Battle and is only for the Hero Story. This stage is only playable as Knuckles.

Overview
The place is under the city in the sewers, and has many switches to change the level of how shallow or deep the water is. The switches are very important, for some of the emerald shards that Knuckles is searching may at the time be under water, and you have to use a switch to change the deepness of the water. Because of this, this is a more of a puzzle-solving stage. There is one part where there is a big hole with a sign right in front of the hole saying that there are ghosts down there. And yes, there are many ghosts down there, some already haunting the room and others just waiting to appear right in front of your face and scare you.