There are a few places in the world of Co* that a player can try going underwater. Due to a lack of specific animation for wading or swimming, along with a lack of layers for the player to move through, the player has to use their imagination that they are actually swimming underwater. There is a place in Grandville where this can be done, a few places outside the war walls in Paragon City, and a mission in the ITF that has a deep enough pull to swim underwater in.