Inaccurate?

Aquatic Breath

( Complete Mage, p. 39)

[Reserve]

Your reservoir of magic allows you to breathe normally even underwater.

Prerequisite

Ability to cast 3rd-level spells,

Benefit

As long as you have a water spell of 3rd level or higher available to cast, you can breathe normally in both air and water. This supernatural quality requires no activation. As a secondary benefit, you gain a +1 competence bonus to your caster level when casting water spells.