Increases speed, and lets you breath and see underwater.
Note: Minify the command to avoid issues :)
Derpy Exploding Chicken, XD
Velociraptor
Scuba Helmet!! Or an enchanted glass block.
Fiery Armor Stand
God Armor Kit
BECOME IRON MAN WITH ONE COMMAND! NO MODS!
DIRT CHEST
OP GOD Armor Set