When the player enters water, the air meter will appear on the layer 3 heads-up display as a bar and starts emptying. If it hits empty, the player dies. If the player gets off the water, it will refill and disappear after a second it reaches full.
Unlike 0x400's (aka. 1024)'s air meter, this generator shows the smallest amount of fill pieces as pixels, not 8x8. Thus not blocky effects.
Edit: made it easy to convert to old status bar and compressed the size on the "init" section