I just found these...

Have inf breath underwater

2208FCE5 00000008
(8 is the max. I think 0 is the least and each one down is another chunk of the air monitor.)

And this one is kinda useless and hard to explain

Resets the animation from X to the air slot currently on the monitor.
(Press L&R)
94000130 FCFF0000
2210679C 0000000X

Where x = any number from 0 to 8.

(NOTE: IF you use both of these codes at the same time it is recommended that in the second code X=0 for any effects to be noticed.)

To understand just what I mean in the second code set X=0.
And turn on the inf air code.
Go into the water and press L&R.
See what happens? Cool huh?
8=no animation, or full health appearence, and 0 = full animation, or death appearence.